JP2006099256A - Arithmetic and control unit and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an arithmetic and control unit that provides computing prerequisites in accordance with predetermined key inputs in a manner that ensures good visibility. <P>SOLUTION: A scientific electronic calculator temporarily displays a symbol mark M10 on a display screen W12 along with preset computing prerequisites I10 if a user has performed key operations according to a predetermined procedure on the display screen W10 that shows computing results. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an arithmetic control device and a program.

  Conventionally, there is a scientific calculator with a calculation function for performing various operations such as trigonometric functions, differentiation and integration as a kind of electronic equipment, and it is used for technical calculation of engineers in educational settings and companies. . By using this scientific calculator, the user can perform various calculations such as floating point calculations at high speed.

In addition, among electronic devices including such a scientific calculator, there are devices that have improved visibility by devising such as emphasizing the corresponding portion of the display portion according to the user's key operation in the input portion. Exists (for example, Patent Document 1). By such a device, the operated content is easier for the user to grasp.
Japanese Patent Application Laid-Open No. 07-200098

  In a conventional scientific calculator, it is common to first set various modes and units, which are prerequisites for calculation, on the setting screen, etc., and then shift to the calculation screen and enter a formula to perform the calculation. It is. However, there are many cases where the user needs to confirm the setting contents again while working on the calculation screen. For example, this is the setting of the angle unit when performing the calculation of the trigonometric function. Enter the formula on the calculation screen to perform the calculation, and when you see the calculated result, check again whether the angle unit setting is the degree method [deg] or the arc degree method [rad]. This is the case when you want to.

  In such a case, the user must suspend the work and return to the setting screen to reconfirm the setting contents. If the setting contents cannot be reconfirmed easily on the calculation screen, it is very convenient to use. bad. There are also scientific calculators that always display angle units with small marks, but they are inferior in visibility because they are small marks, and are often overlooked because they are always displayed. For this reason, the user may inadvertently make a mistake in setting, and may continue working without realizing it.

  The present invention has been made in view of such a problem, and an object of the present invention is to realize an arithmetic control device that makes it possible to know preconditions related to arithmetic operations with high visibility according to predetermined key operation inputs. is there.

In order to solve the above problems, an arithmetic and control unit according to claim 1 is provided:
Condition setting means (for example, the input unit 30 in FIG. 2) for setting a precondition relating to the calculation;
Under the preconditions set by the condition setting means, calculation execution means (for example, the CPU 20 in FIG. 2) that executes calculation according to the key operation input by the user;
Detection means (for example, CPU 20 in FIG. 2; steps A3, A9, and A15 in FIG. 5) for detecting a key operation input according to a predetermined procedure;
In response to detection by the detection means, display control means (for example, CPU 20 in FIG. 2; step A19 in FIG. 5) that performs control to temporarily display a predetermined symbol mark together with the precondition set by the condition setting means. , A21),
It is characterized by having.

The invention according to claim 2 is the arithmetic and control unit according to claim 1,
After temporary display of the display control means according to detection by the detection means, return control means (for example, the CPU 20 in FIG. 2; step in FIG. 5) for returning to the display state before the key operation input by the predetermined procedure. A25) is further provided.

The invention according to claim 3 is the arithmetic and control unit according to claim 1 or 2,
A calculation result display control means (for example, CPU 22 in FIG. 10) for displaying a calculation result by the calculation execution means;
When displaying the calculation result by the calculation result display control means, if the precondition set by the condition setting means is different from the precondition set as a predetermined reference, a predetermined message is displayed together with the calculation result. Message display control means (for example, CPU 22 in FIG. 10; step B5 in FIG. 13; No-> B7) for performing display control;
Is further provided.

The program according to claim 4 is:
On the computer,
A condition setting function (for example, the input unit 30 in FIG. 2) for setting a precondition relating to the calculation;
An operation execution function (for example, the CPU 20 in FIG. 2) that executes an operation according to a key operation input by the user under the preconditions set by the condition setting function;
A detection function (for example, CPU 20 in FIG. 2; steps A3, A9, and A15 in FIG. 5) for detecting a key operation input in accordance with a predetermined procedure;
In response to detection by this detection function, a display control function (for example, CPU 20 in FIG. 2; step A19 in FIG. 5) performs control to temporarily display a predetermined symbol mark together with the precondition set by the condition setting function. , A21),
It is characterized by realizing.

  According to the first or fourth aspect of the present invention, when a key operation input according to a predetermined procedure is detected, a predetermined symbol mark can be temporarily displayed together with a set precondition. Accordingly, it is possible to inform the preconditions related to the calculation with high visibility according to a predetermined key operation input. In addition, since the symbol mark is displayed together, it is clear that it is a temporary precondition display.

  According to the second aspect of the present invention, it is possible to return to the display state before the key operation input after temporarily displaying a predetermined symbol mark together with the set precondition. For this reason, the user can perform computations continuously from the state before the temporary display.

  According to the third aspect of the present invention, the calculation result obtained by executing the calculation is displayed, and when the set precondition is different from the reference precondition, a predetermined message is displayed together with the calculation result. can do. For this reason, since the user can know together with the calculation result that the currently set precondition is different from the reference precondition, it is possible to check whether the calculation has been performed with the desired precondition. it can.

[First Embodiment]
A first embodiment in which the present invention is applied to a scientific calculator will be described with reference to FIGS.

First, the configuration will be described.
FIG. 1 is an overview of the scientific calculator 1 according to the first embodiment. As shown in FIG. 1, the scientific calculator 1 includes a key group 3 including various operation keys and a display 4.

  The key group 3 includes keys for the user to input mathematical formulas to the scientific calculator 1 and instruct execution of processing. For example, the numeric key group 3a, the direction key 3b, the EXE key 3c, and the angle unit setting A key 3d, an inverse trigonometric function input key 3e, a +/− key 3f1, a% key 3f2, and a √ key 3f3 are provided.

  The number key group 3a is a key for inputting numbers. The direction key 3b is a key that is pressed when the cursor is moved or a function is selected. In the present embodiment, the direction key 3b is configured to be able to input instructions in the vertical and horizontal directions. The EXE key 3c is a key for instructing the scientific calculator 1 to execute and determine processing.

  The angle unit setting key 3d is a key that is pressed when setting an angle unit, which is a precondition for calculation. The angle unit “degree (deg)” in the degree method and the angle unit “radian (rad) in the arc degree method are used. "Can be set. The inverse trigonometric function input key 3e is a key pressed when inputting an inverse trigonometric function.

  The +/− key 3f1 is a key for switching between positive and negative, the% key 3f2 is a key for making the calculation result a percentage, and the √ key 3f3 is a key for finding the square root. However, when the keys are pressed in the order of the +/− key 3f1, the% key 3f2, and the √ key 3f3, the scientific calculator 1 detects the key operation, and the predetermined symbol mark and the preconditions relating to calculation (hereinafter, Is called "calculation precondition". Hereinafter, the +/− key 3f1, the% key 3f2, and the √ key 3f3 are collectively referred to as a specific key 3f.

  The display 4 is a part where mathematical formulas, symbol marks and the like corresponding to pressing of various keys are displayed, and performs various displays based on display signals input from the CPU 20. The display 4 is configured by an LCD (Liquid Crystal Display) or the like.

  FIG. 2 is a block diagram illustrating a configuration of the scientific calculator 1. In FIG. 1, the scientific calculator 1 includes a CPU (Central Processing Unit) 20, an input unit 30, a display unit 40, a ROM (Read Only Memory) 50, and a RAM (Random Access Memory) 60. It is configured to be connected for data communication.

  The CPU 20 reads a predetermined program from the ROM 50 based on an instruction input via the input unit 30, temporarily stores the program in the RAM 60, executes various processes according to the program, and displays the processing results on the display unit. 40. That is, the CPU 20 plays a role of comprehensively controlling each part of the scientific calculator 1.

  The input unit 30 is an input device having a key group such as numeric keys and direction keys, and outputs a signal of the pressed key to the CPU 20. By means of key input in the input unit 30, input means such as input of mathematical formulas and instructions for processing execution are realized. The input unit 30 corresponds to the key group 3 shown in FIG.

  The display unit 40 displays various screens based on various signals input from the CPU 20, and corresponds to the display 4 shown in FIG.

  The ROM 50 is read by the CPU 20 as shown in FIG. 3A in addition to a program for setting the scientific calculator 1 to an initial state when the power is turned on, and a first special display process (FIG. 3). 5)), the first special display program 501 that is always executed resident and the symbol mark information 503 are stored.

  The first special display process determines whether or not the user presses the +/- key 3f1, the% key 3f2, and the √ key 3f3 of the specific key 3f in order. And the set calculation preconditions are displayed, and the display is restored after 0.5 seconds have elapsed. The operation of the first special display process will be described later in detail.

  The symbol mark information 503 is graphic information about a predetermined symbol mark displayed in the first special display process, and refers to graphic information about the symbol mark M10 in FIG. 6B, for example.

  The RAM 60 is a storage area for temporarily storing various data as a work area of the CPU 20, and as shown in FIG. 3B, a calculation data storage area 601, a flag storage area 603, and a calculation precondition 605. The calculation precondition 605 further includes an angle unit storage area 605a.

  The calculation data storage area 601 is an area for storing various data related to calculation (hereinafter referred to as “calculation data”). As shown in FIG. 4A, for example, calculation data is “0.5235987. Is stored as.

  The flag storage area 603 is an area for storing a flag set in the first special display process. For example, as shown in FIG. 4B, the flag is stored as “0”.

  The angle unit storage area 605 is an area for storing an angle unit set when the user presses the angle unit setting key 3d. As shown in FIG. 4C, for example, the angle unit is “radian”. Is stored as.

Next, the operation will be described.
FIG. 5 is a flowchart showing the flow of the first special display process that is executed residently in the scientific calculator 1 by the CPU 20 reading and executing the first special display program 501. The first special display process is executed in parallel with the normal calculation process in the scientific calculator 1.

  First, the CPU 20 determines whether or not a key operation has been performed by the user (step A1). When it is determined that the key operation has not been performed (step A1; No), the CPU 20 waits as it is and when it is determined that the key operation has been performed (step A1). Yes), it is determined whether or not the user presses the +/− key 3f1 (step A3).

  If it is determined in step A3 that the +/− key 3f1 has been pressed (step A3; Yes), the CPU 20 stores and holds the calculation data in the calculation data storage area 601 (step A5), and sets the flag to “ 1 ”(step A7) and after storing in the flag storage area 603, the process returns to step A1.

  If it is determined in step A3 that the +/− key 3f1 has not been pressed (step A3; No), the CPU 20 determines whether or not the% key 3f2 has been pressed by the user (step A9). If it is determined that the% key 3f2 has been pressed (step A9; No), it is determined whether the flag stored in the flag storage area 603 is “1” (step A11), and “1”. If it is determined (step A11; Yes), the flag is set to “2” (step A13), and after storing / updating in the flag storage area 603, the process returns to step A1.

  If it is determined in step A9 that the% key 3f2 has not been pressed (step A9; No), the CPU 20 determines whether or not the √ key 3f3 has been pressed by the user (step A15). If it is determined that the √ key 3f3 is pressed (step A15; Yes), it is determined whether or not the flag stored in the flag storage area 603 is “2” (step A17), and “2”. If it is determined (step A17; Yes), graphic information of a predetermined symbol mark is read from the symbol mark information 505, and the symbol mark is displayed on the display unit 40 (step A19).

  Next, the CPU 20 displays the angle unit stored in the angle unit storage area 605a on the display unit 40 as a calculation precondition (step A21), and whether 0.5 second has elapsed since the calculation precondition was displayed. Is determined (step A23). When it is determined that 0.5 seconds have not elapsed (step A23; No), the CPU 20 waits as it is, and when it is determined that 0.5 seconds have elapsed (step A23; Yes), The calculation data held in step A5 is restored to restore the display (step A25), the flag is set to “0” (step A27), stored / updated in the flag storage area 613, and then returned to step A1. .

  When it is determined in step A11 that the flag is not “1” (step A11; No), or when it is determined in step A17 that the flag is not “2” (step A17; No), the CPU 20 performs step The process proceeds to A27. Even when it is determined in step A15 that the √ key 3f3 has not been pressed (step A15; No), the CPU 20 proceeds to step A27.

Next, the processing so far will be described more specifically with reference to a display screen example.
First, an example in which “radian (rad)” is set as the angle unit by the user will be described.

FIG. 6A shows a display screen W10 that is an example of a display screen in a state where the calculation result is displayed by the execution of the calculation. A numerical expression “sin ⁻¹ (0.5)” to be calculated is displayed as N10 in the upper left portion of the display screen W10, and a calculation result “0.5235987” obtained by calculating the numerical expression is displayed in the lower right portion. Displayed as R10.

  FIG. 6B shows a display screen W12 which is an example of a display screen on which symbol marks and calculation prerequisites are displayed. When the user presses the +/− key 3f1, the% key 3f2, and the √ key 3f3 as the specific key 3f in sequence (step A3 in FIG. 5; a series of steps from Yes to A17; Yes), the display screen W12 The symbol mark M10 is displayed at the center of (Step A19 in FIG. 5), and the unit of angle is displayed as a calculation precondition I10 immediately below (Step A21 in FIG. 5). Thereby, the user can confirm that the set angle unit is “radian (rad)” during the work.

  FIG. 6C shows a display screen W14 that is an example of a display screen that is displayed after 0.5 seconds have elapsed since the display screen W12 was displayed. Since 0.5 second has elapsed since the display screen W12 was displayed (step A23 in FIG. 5; Yes), the same screen as the display screen W10 is displayed as the display screen W14 (step A25 in FIG. 5). ). That is, the display of the symbol mark and the calculation precondition is temporary, and immediately returns to the original display screen, so that the user can continuously perform the calculation without disturbing the work.

Next, an example in which the user changes the setting of the angle unit from “radian (rad)” to “degree (deg)” will be described in the same manner.
FIG. 7A shows a display screen W20 which is an example of a display screen when a calculation result is displayed by calculation execution. In the upper left part of the display screen W20, the mathematical expression “sin ⁻¹ (0.5)” to be calculated is displayed as N10, and in the lower right part, the calculation result “30.0000” obtained by calculating the mathematical expression is displayed. Displayed as R20.

  FIG. 7B shows a display screen W22 which is an example of a display screen on which symbol marks and calculation prerequisites are displayed. When the user presses the +/− key 3f1, the% key 3f2, and the √ key 3f3 as the specific key 3f in order (step A3 in FIG. 5; a series of steps from Yes to A17; Yes), the display screen W22 The symbol mark M10 is displayed at the center of (Step A19 in FIG. 5), and the unit of angle is displayed as a calculation precondition I20 immediately below (Step A21 in FIG. 5). Thereby, the user can reconfirm that the set angle unit is “degree” in the middle of the work.

  FIG. 7C shows a display screen W24 that is an example of a display screen that is displayed after 0.5 seconds have elapsed since the display screen W22 was displayed. When 0.5 second has elapsed since the display screen W22 was displayed (step A23 in FIG. 5; Yes), the same screen as the display screen W20 is displayed as the display screen W24 (step A25 in FIG. 5). ). As a result, the user can continue to perform calculations without disturbing the work.

  As described above, according to the first embodiment, when the user presses the +/− key 3f1, the% key 3f2, and the √ key 3f3 as the specific key 3f in order, the predetermined symbol mark and the calculation precondition Is displayed, and the display can be restored after 0.5 seconds have elapsed. Accordingly, it is possible to realize an arithmetic control device that makes it possible to clearly notify the preconditions relating to the calculation in accordance with a predetermined key operation input.

[Modification]
There are various types of predetermined symbol marks displayed in the first embodiment. For example, an arbitrary character represented by the character M12 shown in FIG. 8A may be displayed, or an arbitrary character string represented by the character string M14 shown in FIG. 8B. Of course, it may be displayed.

  In addition, although it has been described that the predetermined symbol mark and the calculation precondition are displayed, it is not always necessary to display the calculation precondition in the sense of alerting the user, and only the predetermined symbol mark is displayed. You may decide. For example, by displaying only the character string M14 shown in FIG. 8B as a symbol mark, a display screen W28 as shown in FIG. 8C is displayed.

[Second Embodiment]
With reference to FIGS. 9 to 16, a second embodiment in which the present invention is applied to a calculator that mainly handles four arithmetic operations will be described.

First, the configuration will be described.
FIG. 9A is an overview of the calculator 10 according to the second embodiment. As shown in the figure, the calculator 10 includes a key group 6 including various operation keys, a rounding selector 7, a decimal point selector 8, and a display 9.

  The key group 6 includes keys for the user to input numerical values to the calculator 10 and instruct execution of processing. For example, the key group 6 includes a numeric key group 6a, a = key 6b, and a specific key 6c.

  The number key group 6a is a key for inputting numbers. The = key 6b is a key for instructing the calculator 10 to execute processing. Since the role of the specific key 6c is the same as that of the specific key 3f according to the first embodiment, the description thereof is omitted.

  The rounding selector 7 is a selector for the user to set a rounding method for rounding the calculation result, which is a calculation precondition. The decimal point display “F”, the rounding down “CUT”, the rounding up “UP”, and the rounding off “5/4”. Either of these can be set. However, the decimal point display “F” is a special setting for displaying the calculation result up to the full digit that can be displayed on the display 9.

  The decimal point selector 8 is a selector for the user to set the position of the decimal point, which is a precondition for calculation, and a value from “0” to “4” can be set. The calculation result is rounded by the rounding method (hereinafter referred to as “rounding setting”) set by the rounding selector 7 at the decimal point position set here (hereinafter referred to as “decimal point setting”). . For example, if the calculation result is “3.3333”, the rounding setting is rounded down “CUT”, and the decimal point setting is “2”, the calculation result “3.3333” is rounded down to two decimal places. "Is displayed. However, when the rounding setting is the decimal point display “F”, since the calculation result is always displayed up to the full displayable digit, the decimal point selector 8 is not effective.

  The display 9 is a part for displaying mathematical formulas, symbol marks, and the like in response to pressing of various keys, and performs various displays based on display signals input from the CPU 22. The display 9 is configured by an LCD (Liquid Crystal Display) or the like, and has a so-called “Japanese character display type” segment system using seven segments.

  FIG. 9B shows a configuration of the display 9, and includes a first symbol mark display body 9a for displaying the first symbol mark and a second symbol mark display body 9b for displaying the second symbol mark. I have.

  FIG. 10 is a block diagram illustrating a configuration of the calculator 10. In the figure, a calculator 10 includes a CPU (Central Processing Unit) 22, an input unit 32, a display unit 42, a ROM (Read Only Memory) 52, and a RAM (Random Access Memory) 62. It is configured to be communicable. Detailed functions of the respective parts are substantially the same as those in the first embodiment, and thus description thereof is omitted.

  FIG. 11A is a diagram illustrating a configuration of the ROM 52 included in the calculator 10 according to the second embodiment. The ROM 52 is read by the CPU 22 with the first special display program 501, the second special display program 521 that is executed as the second special display process (see FIG. 13), the first symbol mark information 522, and the second symbol. The mark information 523 and the standard calculation precondition 525 are stored. The first special display program 501 is the same as that in the first embodiment.

  The second special display process is a process for displaying the second symbol mark when the user depresses the = key 6b and determines that the set calculation precondition is different from the standard calculation precondition, and is resident. Is always running. The operation of the second special display process will be described later in detail.

  The first symbol mark information 522 is a symbol mark displayed in the first special display process (in this embodiment, it is described as “first symbol mark” instead of “symbol mark” in order to distinguish it from the second symbol mark). .), For example, the graphic information about the first symbol mark M30 in FIG. 14B. The second symbol mark information 523 is information about the second symbol mark displayed in the second special display process, and refers to information about the second symbol mark M40 in FIG. 15A, for example.

  The standard calculation precondition 525 is a calculation precondition set as an initial setting, and “0” is set as the standard decimal point setting 525a and decimal point display “F” is set as the standard rounding setting 525b.

  FIG. 11B is a diagram illustrating a configuration of the RAM 62 according to the second embodiment. The RAM 62 includes a calculation data storage area 621, a flag storage area 623, and a calculation precondition 625. The calculation precondition 625 further includes a decimal point setting storage area 625a and a rounding setting storage area 625b. Note that the calculation data storage area 621 and the flag storage area 623 are the same as the calculation data storage area 601 and the flag storage area 603 according to the first embodiment, and thus description thereof is omitted.

  The calculation precondition 625 is a precondition related to calculation set by the user, and the decimal point setting is stored in the decimal point setting storage area 625a and the rounding setting is stored in the rounding setting storage area 625b.

  The decimal point setting storage area 625a is an area for storing the decimal point setting. For example, as shown in FIG. 12A, the decimal point setting is stored as “0”.

  The rounding setting storage area 625b is an area for storing rounding settings. For example, as shown in FIG. 12B, the rounding setting is stored as “CUT”.

Next, the operation will be described.
FIG. 13 is a flowchart showing the flow of the second special display process executed in the calculator 10 by the CPU 22 reading and executing the second special display program 521.

  First, the CPU 22 determines whether or not a key operation has been performed by the user (step B1). When it is determined that no key operation has been performed (step B1; No), the CPU 22 waits as it is, and when it is determined that a key operation has been performed (step B1). Yes), it is determined whether or not the user presses the = key 6b (step B3).

  If it is determined in step B3 that the key 6b has not been pressed (step B3; No), the process returns to step B1, and if it is determined that the key 6b has been pressed (step B3; Yes), the CPU 22 is set. Whether or not the calculation precondition 625 is the same as the standard calculation precondition 525 (step B5). The same calculation precondition means that the decimal point setting stored in the decimal point setting storage area 625a is the same as the standard decimal point setting 525a and the rounding setting stored in the rounding setting storage area 625b is the standard rounding. This is the same as the setting 525b.

  In step B5, when it is determined that the calculation preconditions are not the same (step B5; No), the CPU 22 reads the second symbol mark information from the second symbol mark information 523, and the second symbol mark is read. The information is displayed on the display unit 42 (step B7), and the process returns to step B1. If it is determined that the calculation preconditions are the same (step B5; Yes), the process directly returns to step B1.

Next, the processing so far will be described more specifically with reference to a display screen example.
First, an explanation will be given of an example where the calculation precondition 625 is the same as the standard calculation precondition 525.

  FIG. 14A shows a display screen W30 which is an example of a display screen in a state where the calculation result is displayed by the execution of the calculation. In the lower right part of the display screen W30, the calculation result “3.3333” is displayed as R30.

  FIG. 14B shows a display screen W32 that is an example of a display screen when the first symbol mark and the calculation precondition are displayed. When the user presses the +/− key 6c1, the% key 6c2, and the √ key 6c3 in sequence (step A3 in FIG. 5; a series of steps from Yes to A17; Yes), the first symbol mark display body 9a is displayed. The first symbol mark M30 is displayed (step A19 in FIG. 5), and the calculation precondition I30 indicating the rounding setting is displayed on the right side (step A21 in FIG. 5). Thus, the user can reconfirm that the set rounding setting is the decimal point display “F” during the work.

  FIG. 14C shows a display screen W34 that is an example of a display screen that is displayed after 0.5 seconds have elapsed since the display screen W32 was displayed. When 0.5 second has elapsed since the display screen W32 was displayed (step A23 in FIG. 5; Yes), the same screen as the display screen W30 is displayed as the display screen W34 (step A25 in FIG. 5). . That is, the display of the first symbol mark and the calculation precondition is temporary and returns immediately to the original display screen, so that the user can continue the calculation.

Next, the case where the rounding setting is changed from the decimal point display “F” to “CUT” will be described. However, the decimal point setting remains the standard decimal point setting “0”.
FIG. 15A shows a display screen W40 that is an example of a display screen when a calculation result is displayed by calculation execution. In the lower right part of the display screen W40, the calculation result “3” is displayed as R40. Further, since the rounding setting is changed from the decimal point display “F” to “CUT”, the set calculation precondition is not the same as the standard calculation precondition (step B5 in FIG. 13; No), the second symbol The second symbol mark M40 on the mark display body 9b is lit (step B7 in FIG. 13). Thus, the user can clearly confirm that the rounding setting is different from the standard calculation precondition.

  FIG. 15B shows a display screen W42 which is an example of a display screen when the first symbol mark and the calculation precondition are displayed. When the user presses the +/− key 6c1, the% key 6c2, and the √ key 6c3 in order (step A3 in FIG. 5; a series of steps from Yes to A17; Yes), the first symbol mark display body 9a is displayed. The first symbol mark M30 is lit and displayed (step A19 in FIG. 5), and the calculation precondition I40 indicating the rounding setting and the decimal point setting is displayed on the right side (step A21 in FIG. 5). Accordingly, the user can confirm that the set rounding setting is “CUT” and the decimal point setting is “0”.

  FIG. 15C shows a display screen W44 that is an example of a display screen that is displayed after 0.5 seconds have elapsed since the display screen W42 was displayed. When 0.5 seconds have elapsed since the display screen W42 was displayed (step A23 in FIG. 5; Yes), the same screen as the display screen W40 is displayed as the display screen W44 (step A25 in FIG. 5). . As a result, the state before the display of the display screen W42 is restored, so that the user can continue to perform calculations.

[Modification]
Similar to the first embodiment, in the second embodiment, various types of first symbol marks to be displayed are conceivable. For example, a character M32 as shown in FIG. 16 (a) may be displayed, or a character string M34 as shown in FIG. 16 (b) may be displayed.

  Moreover, although demonstrated as displaying a 1st symbol mark and a calculation precondition, in order to call a user's attention, it is not necessary to display a calculation precondition, and only a 1st symbol mark is displayed. It may be. For example, only the character string M34 shown in FIG. 16B may be displayed as the first symbol mark, and a display screen W48 as shown in FIG. 16C may be displayed.

1 is an overview diagram of a scientific calculator to which the present invention is applied. The block diagram which shows the internal structure of the scientific calculator to which this invention is applied. (A) The figure which shows the data structure of ROM in 1st Embodiment. (B) The figure which shows the data structure of RAM in 1st Embodiment. (A) The figure which shows the calculation data storage area. (B) The figure which shows a flag storage area. (C) The figure which shows an angle unit storage area. The flowchart which shows the flow of a 1st special display process. The figure which shows an example of the transition of a display screen. The figure which shows an example of the transition of a display screen. The figure which shows the modification of 1st Embodiment. (A) Overview of a calculator to which the present invention is applied. (B) The figure which shows the structure of a display. The block diagram which shows the internal structure of the calculator to which this invention is applied. (A) The figure which shows the data structure of ROM in 2nd Embodiment. (B) The figure which shows the data structure of RAM in 2nd Embodiment. (A) The figure which shows a decimal point setting storage area. (B) The figure which shows a rounding setting storage area. The flowchart which shows the flow of a 2nd special display process. The figure which shows an example of the transition of a display screen. The figure which shows an example of the transition of a display screen. The figure which shows the modification of 2nd Embodiment.

Explanation of symbols

1 Scientific Calculator 3 Key Group 3a Numeric Key Group 3b Direction Key 3c EXE Key 3d Angle Unit Setting Key 3e Inverse Trigonometric Function Input Key 3f Specific Key 4 Display 20 CPU
30 Input unit 40 Display unit 50 ROM
501 First special display program 503 Symbol mark information 60 RAM
601 Calculation data storage area 603 Flag storage area 605 Calculation prerequisite 70 bus

Claims (4)

Condition setting means for setting preconditions relating to the calculation;
Under the preconditions set by the condition setting means, calculation execution means for executing calculation according to the key operation input by the user,
Detecting means for detecting a key operation input according to a predetermined procedure;
Display control means for performing control to temporarily display a predetermined symbol mark together with the precondition set by the condition setting means in response to detection by the detection means;
An arithmetic and control unit comprising:   2. The apparatus according to claim 1, further comprising a return control means for returning to a display state before a key operation input by the predetermined procedure after the temporary display of the display control means in response to detection by the detection means. The arithmetic and control unit described. A calculation result display control means for displaying a calculation result by the calculation execution means;
When displaying the calculation result by the calculation result display control means, if the precondition set by the condition setting means is different from the precondition set as a predetermined reference, a predetermined message is displayed together with the calculation result. Message display control means for controlling the display;
The arithmetic control device according to claim 1, further comprising: On the computer,
A condition setting function for setting preconditions related to computation;
Under the preconditions set by this condition setting function, an operation execution function for executing an operation according to a key operation input by the user,
A detection function for detecting a key operation input according to a predetermined procedure;
A display control function for performing control to temporarily display a predetermined symbol mark together with the precondition set by the condition setting function in response to detection by the detection function;
A program to realize

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