JPH0720768Y2 - Small electronic calculator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a small electronic computer having an official calculation function.

[Prior Art and its Problems] Conventionally, there is a small electronic computer that executes an operation according to a formula by keying the formula. Some small electronic calculators of this type provided a display prompting the user to enter variable data, but none of the formulas themselves entered. Therefore, it is conceivable that the input formula is directly read and displayed on the display unit. However, in some cases, simply displaying the formula may hinder the understanding of the user.

For example, when the solution of the quadratic equation “ax ² + bx + c = 0” is to be calculated with a small electronic calculator that can display the above formula, the formula that is actually input for calculation is However, when it is displayed as a formula, it is clearly easier to understand if it is displayed as “ax ² + bx + c = 0”. In this way, when the formula is particularly complicated, the user may not be able to understand the contents of the formula by displaying the formula as it is, which may cause confusion.

[Purpose of Invention] This invention was made in view of the above situation.
Provide a small electronic calculator that can input and set a formula (meaning any mathematical formula) that actually executes a calculation by a simple key input operation and a character string corresponding to this formula and display this on the display unit The purpose is to do.

[Points of Invention] In this invention, a character string for display is additionally set in a formula used when performing a calculation, and the above character string is displayed when executing the formula calculation.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings.

FIG. 1 shows its circuit configuration, and 11 is a key input section. Numerical keys (denoted as "NK" in the figure) 11a for inputting numerical data, and function keys (denoted as "FK" in the figure) 11 for inputting calculation contents and the like are input to the key input unit 11.
b, Alphabet key for inputting alphabetic data (denoted as "AK" in the figure) 11c, Program key for designating program operation number (denoted as "PRG" in the figure) 11d, and character string data to be displayed are set separately "〃" key 11e, character string data and official data to be displayed and official data not displayed are set separately: ":" key 11f, "[" key 11g, "]" key to set official data not to be displayed 11h, the key operation signal is sent to the control unit 12. The control unit 12 is composed of a ROM storing various control programs, and the key input unit 11
An official ROM 13 in which a large number of official data are stored and set in advance in response to a key operation signal from, and a program RAM 1 for storing program data including official data input by the user.
4. Send a control signal to each of the input buffers 15 that store the input data. The contents stored in each of the official ROM 13, the program RAM 14, and the input buffer 15 are read out to the data RAM 16 according to a command from the control unit 12. Although not shown here, the data RAM 16 has a display buffer, a mathematical formula buffer, a pointer, etc. inside, and is used for data processing. The addressing data is sent to the RAM 14 and the display data is sent to the display unit 18.

As described above, the program RAM 14 stores a plurality of formulas, for example, 9 formulas by the user's own program. In this case, as shown in FIG. 2 (A), the program RAM 14 is assigned with numbers "1" to "9" 9
It is possible to divide the area into individual areas, and store the user's own formula together with the corresponding character string in each area.

On the other hand, the formula ROM 13 stores a plurality of, for example, 90 formulas set in advance as described above. In this case, the official ROM 13 contains "10" to "99" as shown in FIG. 2 (B).
It is divided into 90 areas numbered with, and it is possible to store the formula in advance in each of the areas.

Next, the operation of the above embodiment will be described.

Now, as shown in FIG. 3, one of the areas of the program RAM14 It is assumed that the following data is stored as a self-made formula by the program of the user. This data is triangle 3
"Heron's formula" for obtaining the area "S" of the triangle from the lengths of the sides "a", "b", and "c", that is, (S = (a + b + c) / 2) ”, the numerical keys 11a, function keys 11b, alphabet keys 11c,“ 〃 ”key 11e,“: ”key 11
It is created by keystrokes of f, "[" key 11g and "]" key 11h, and is the formula between the first code "〃" and the second code "〃". Is displayed on the display unit 18, the formula “s = (a + b + c) / 2” sandwiched between the code “[” and the code “]” is executed but not displayed on the display unit 18. Continued formula Is set as a formula for executing and displaying.
In this case, the code ":" entered by operating the ":" key 11f indicates the character string and the official delimiter position,
"〃" key 11e Operation code "〃" is added to both ends of the displayed character string, "[" key 11g, "]" key 1
The code "[", "]" by the operation of 1h is attached to both ends of the formula that is not displayed. 2 in the above memory settings
Since the character string to be displayed sandwiched between the two codes "〃" is the same as the last displayed formula, the same formula is displayed alternately on the display section 18, but the present invention is not limited to this. Alternatively, as a character string to be displayed instead, for example, a character string "HERON" (heron) may be key-in by the alphabet key 11c.

Now, enter the data created in this way using the program key 11
Use d and the numeric key 11a to specify the area and read it to the formula buffer in the data RAM16, and then change the variables "a" and "b"
Numerical values corresponding to "c" are entered by the numerical keys 11a. And, for example, alphabet keys as key input to instruct official execution by this program
When "RUN" is instructed by 11c, the process shown in FIG. 4 is performed in response to this official execution instruction.

In FIG. 4, first, in step S01, the data RAM is temporarily stored.
After clearing the contents of the display buffer and the pointer in 16 and the display state of the display unit 18, the process proceeds to step S02. In step S02, the content of the pointer is updated to read the code at the beginning of the formula buffer, which is "〃".
Or not. In this case, the determination result is YES, and the process proceeds to step S03 to sequentially update the contents of the pointer, so that from the code next to this code "〃" to the code before the second code "〃", that is, the character Row Is read out, stored in the display buffer, and displayed on the display unit 18. Then, in step S04, the pointer is further updated and the code next to the second code "〃" is ":".
Or not. This code ":" is always set to indicate the character string and the official delimiter position as described above, and if the judgment result is NO, this delimiter setting is not made and the input is incorrect. Therefore, the processing ends in an error, the fact is displayed, and the processing ends. Here, the determination result is YES, and then step S
Go to 05 to update the pointer and determine whether or not there is an input code after this code ":". If it is determined to be NO, it means that the official input following the character string has not been made, so the official execution cannot be performed, and this processing ends with the above. The determination is YES, the process proceeds to step S06, the pointer is updated, and the process returns to step S02.

In the subsequent step S02, if it is determined that the code “[” located next to the code “:” is not the code “〃”, the process proceeds to step S07, and it is determined whether or not this is the code “[”. . The determination result is YES, and then step S08
By sequentially updating the contents of the pointer with, read from the code next to the code "[" to the code before the code "]", that is, the undisplayed formula "s = (a + b + c) / 2" and hold it in the formula buffer. To do. Also, along with this, the variables "a" and "b" that were key-inputted before the instruction to execute the above formula
The numerical value corresponding to "c" is read from the input buffer 15, and the formula is executed by the calculation unit 17. After temporarily holding the numerical data obtained as a result in the internal register, the pointer is further updated in step S09, and it is determined whether or not the code located next to this formula is the code "]". If it is judged to be NO, it means that the official setting not to display is not made correctly, so the processing will result in an error, and that effect will be displayed and the processing will end, but here the judgment result will be YES. , And then to step S10. And this step S10
The pointer is further updated with and the process proceeds to step S04.

In step S04, it is determined whether or not the code next to this code "]" is ":". When the determination result is YES, the process proceeds to step S05, the pointer is updated, and it is determined whether or not there is an input code after this code ":". Again, the code is next, so the decision is YES,
Then, in step S06, the pointer is updated, and then step S02 is reached.

In this step S02, it is determined that the code located next to the above code ":" is not "〃", and in the following step S07 it is also determined that it is not the code "[", the remaining one is the official formula to be displayed. Data, then step
By going to S11 and sequentially updating the contents of the pointer, from the code next to the code ":" to the code before the last END code, that is, the formula to be displayed. Is read out, stored in the display buffer and displayed on the display unit 18. Next, in step S12, the calculation result of the formula not displayed stored in the internal register is used, and the displayed formula is executed by the calculator 17. The obtained numerical data is input to the display buffer and displayed on the display unit 18, and the process is completed.

The symbols "〃", ":", "[", "]" and the like used in the above-mentioned examples are merely examples, and it goes without saying that they are not limited to these symbols. , It suffices to be able to set a character string only for display, which is not directly related to the official calculation.

[Advantage of Device] As described in detail above, according to the device, a character string for display is additionally set in correspondence with the formula used for calculation, and the character string is displayed when executing the formula calculation. Since it was made to do so, a small electronic calculator that can input and set the formula to actually execute the operation by simple key input operation and any character string corresponding to this formula and display this on the display unit Can be provided.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a block diagram showing a circuit configuration, and FIG. 2 is a program RA of FIG.
FIG. 3 is a diagram showing the division setting of the areas of M and the official ROM, FIG. 3 is a diagram showing the stored contents of the program RAM, and FIG. 4 is a flow chart showing the processing contents at the time of official execution. 11 …… Key input section, 11a …… Numeric key (NK), 11b …… Function key (FK), 11c …… Alphabet key (AK), 11d …… Program key (PRG), 11e ……
“〃” key, 11f …… “:” key, 11g …… “[” key,
11h …… “” key, 12 …… control block, 13 …… official ROM, 14
...... Program RAM, 15 …… Input buffer, 16 …… Data RAM, 17 …… Computing section, 18 …… Display section.

Claims (1)

[Scope of utility model registration request] 1. A formula data input means for inputting the same formula as a plurality of formula data having different formulas, and a formula data to be displayed and a calculation among the formula data inputted by the formula data input means. First specifying means for specifying the official data, and official data to be displayed and official data not to be displayed, which are input by the official data input means and used in the calculation specified by the first specifying means Second specification means, calculation instruction means for instructing execution of the official operation, and official data of the operation specified by the first specification means when the execution of the operation is instructed by the operation instruction means And an arithmetic means for performing an arithmetic operation, and when the arithmetic operation is performed by the arithmetic means, the arithmetic means is designated by the first designating means among the plurality of official data. Small electronic calculator, characterized in that anda formula display means for displaying only the official data to be displayed as specified by the formula data and the second designating means to be displayed.