JPH1153318A - Desk top electronic calculator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic calculator that has a function to detect a point where an input error occurs in a numerical formula. SOLUTION: An electronic calculator 10 is equipped with the first display part 20 for displaying a numerical formula to be inputted anew and the second display part 22 for making the previously inputted numerical formula respond to a new input and displaying it and, when a discrepancy is detected in display contents of the first display part 20 and the second display part 22, the discrepancy is made to be recognized by an operator by an alarm and an emphasis display of the second display part 22. Thus, the operator can simply recognize a point where an input error occurs in the numerical formula by always executing one time new input without monitoring a display part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a desk-top electronic calculator, and more particularly, to a desk-top electronic calculator (hereinafter abbreviated as a calculator) that facilitates input verification.

[0002]

2. Description of the Related Art In a calculation using a calculator, a calculation error often occurs due to an input error by an operator. As a countermeasure, calculators having a so-called answer check function are currently on the market, in which the same mathematical expression is re-input, and if the calculation result by the previous input matches the calculation result by the re-input, "OK" is displayed.

[0003]

However, the calculator having the above-described answer check function can detect whether or not an input error exists in an input mathematical expression. Does not have the function of detecting

[0004] In view of the above, an object of the present invention is to provide a calculator having a function of detecting a place where an input error has occurred in a mathematical expression.

[0005]

To achieve the above object, a calculator of the present invention (hereinafter referred to as a first invention) comprises a keyboard for inputting mathematical expressions and a memory for storing the mathematical expressions input by keys. Unit, an operation unit that operates in accordance with a key-input mathematical expression, a first display unit that displays a newly input mathematical expression, and a second display that displays a previously input mathematical expression in response to a new input And a unit.

Preferably, the calculator according to the present invention further includes an alarm unit for issuing an alarm when a mismatch between the first display unit and the second display unit is detected. Thus, when performing a new input, the operator can easily recognize a place where an input error has occurred in the mathematical expression by an alarm without monitoring the first and second display units.

[0007] Preferably, the calculator of the present invention has the first display section and the second display section arranged in two stages.

[0008] In order to achieve the above object, a calculator according to a second aspect of the present invention stores a mathematical expression entered last time, and makes a mismatch between the newly entered mathematical expression and the previously entered mathematical expression. It is characterized by issuing an alarm when present. According to the second aspect, as in the first aspect, the operator can easily recognize a place where an input error has occurred in the mathematical expression by using a warning.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be further described based on embodiments of the present invention with reference to the drawings. FIG. 1 is a plan view showing the appearance of a calculator according to an embodiment of the present invention,
FIG. 2 is a block diagram showing a basic configuration of the calculator. The calculator 10 includes a frame 11, a keyboard 12 for inputting mathematical expressions, and a storage unit 14 for storing mathematical expressions and calculated values.
And an operation unit 15 that performs an operation according to a key-input mathematical expression
And a display unit 1 having a panel-shaped display surface and displaying two rows
6, an alarm unit 17 for issuing an alarm, and a bus 13 for transmitting a signal therebetween. The calculator 10 is configured to be freely switchable between a normal calculation mode for performing four arithmetic operations, exponentiation calculations, and the like, and a verify mode for checking the calculations performed in the normal calculation mode. The calculator 10 further includes a solar cell photoelectric conversion panel 18 and a switch 1 for turning the calculator 10 on and off.
9 is provided. Although the power supply of the calculator 10 is a solar battery, it may be a dry battery.

The keyboard 14 has a key indicated by "VER" for shifting from the normal calculation mode to the verify mode, an operation sign key for inputting an operator, a numeric key for inputting a number, and others. Key of four types.

The operation sign keys are "+", "-",
It is displayed with "x" and "÷" respectively,
Four arithmetic operation keys for performing subtraction, multiplication, and division;
It is composed of a key that is displayed with “=” and executes calculation, a key that is displayed with “∧” and performs exponentiation, and a key that is displayed with “+/-” and switches between positive and negative signs. The number keys are displayed with numbers from “0” to “9”, respectively, and include ten keys for inputting each number from 0 to 9.

The calculator 10 uses "M" as another key.
And "F", a memory key for setting variable memories Mxx and Fxx (xx is an integer from 0 to 99) in combination with numeric keys, and "MGT" for the memory Mxx. A key for adding the input numerical value and storing the added value in the storage unit, and "TOT" is displayed,
A key for adding the calculated value calculated every time the “=” key is pressed and storing the calculated value in the storage unit as an added value. Further, the calculator 10 includes keys that are conventionally generally displayed as “M +”, “F +”, “.”, “C”, “CE”, and “CA”. Calculator 10 may further include keys having several standard functions.

Each time “=” is input, the storage unit stores the previously input formula as a formula with a formula number.

The display unit 16 includes an upper first display unit 20
And a lower second display unit 22. Calculator 1
In the normal calculation mode, 0 indicates an input in the upper row and a calculation result in the lower row. That is, in the normal calculation mode, the calculator 10 converts the mathematical formula number, the four arithmetic operators or the numerical value input after the input of “=”, and the four arithmetic operators or “=” input immediately after the input of the numerical value as the first numerical value. In the first display unit 20, the value calculated by the arithmetic unit in response to the input of the four arithmetic operators or “=” is displayed on the second display unit 22 as an intermediate calculation result. In the verify mode, the calculator 10 displays a new input in the upper part and a previous input in response to the new input in the lower part.

In the following, a description will be given of an example in which the calculation of the formula "1 + 2 + 3 + 4 + 5 + 6" of the formula number 1 is performed in the normal calculation mode. When the keys "1" and "+" are sequentially pressed, "1+" is input to the calculator 10, and "0+"
The calculation of “1” is executed, and the result is displayed on the display unit 16 as shown in Table 1.

[Table 1] Numerals in parentheses at the top indicate formula numbers, and “□” indicates a mark indicating a cursor position.

Subsequently, when the keys "2" and "+" are sequentially pressed, the calculation unit executes the calculation of "1 + 2" to calculate 3, which is displayed on the display unit 16 as shown in Table 2. Is done.

[Table 2] Further, when the keys "3" and "+" are sequentially pressed, the calculation unit performs the calculation of "3 + 3", and the display unit 16 displays as shown in Table 3.

[Table 3] Hereinafter, the keys "4", "+", "5", "+", "6" and "=" are pressed in this order. By pressing the “=” key, the display is displayed on the display unit 16 as shown in Table 4.

[Table 4] The above equation is stored in the storage unit as equation number 1.

A method of checking the calculation of the formula number n, which has already been calculated, using the calculator 10 will be described below. First, the “VER”, “=” and “n” keys are sequentially pressed. As a result, the calculator 10 shifts to the verify mode. Here, in order to check the mathematical expression input immediately before the check, the keys “VER” and “=” may be sequentially pressed.

Subsequently, when the mathematical expression of the mathematical expression number n is newly input, the newly input mathematical expressions are sequentially displayed in the upper row,
In the lower part, the previously input mathematical expression (numerical value and operator) is displayed in contrast to the new input. When the display contents are different between the upper and lower tiers, a warning sound is emitted from the calculator 10 and the corresponding part of the mathematical expression displayed on the lower tier is inverted,
It is highlighted by shading.

If the presence of an input error is detected by an alarm sound or highlighting, and the operator determines that an input error has occurred in the input in the verify mode based on the input data, the input is corrected. Continue the verify mode. Conversely, if the operator determines that there was an input error in the previously entered formula, "VER"
Press the key. As a result, the calculator 10 shifts to a state of waiting for a correction input to the previously input mathematical expression, and when a correction input is performed, returns to a state of continuing the check performed so far.
Hereinafter, the same operation as described above is performed for each formula number to be checked. To end the verify mode and shift to the normal calculation mode, press the “=” key.

The formula "1 + 2 + 3 + 4 + 5 +" of the formula No. 7
6 = (21) "will be described in more detail with an example in which the calculation is performed immediately after the calculation of the formula number 11 is executed. First, "VE
The keys "R", "=", and "7" are sequentially pressed. As a result, the calculator 10 shifts to the verify mode, and the display 16
Are displayed as shown in Table 5 (step S1).

[Table 5]

Next, when the mathematical expression of mathematical expression number 7 is newly input, "1+", "2+", and "3+" are sequentially displayed in the upper line, and the mathematical expression responding to the numerical expression displayed in the upper line is displayed in the lower line. Each is displayed (step S2). In addition, "1+
Table 6 shows the display state of the display unit 16 when the input of “2 + 3 +” is correctly input in both the normal calculation mode and the verify mode.

[Table 6] In Table 6, “□” in the upper row is a mark indicating the cursor position, and “□” in the lower row is a mark that moves so as to be located immediately below “□” in the upper row. The same applies to Table 8. .

Subsequently, an input error occurs, for example, "44
When "+" is input, the alarm differs from the previously input correct numerical value and the operator "4+", so that an alarm sound is issued, and the lower part is highlighted by shading or the like as shown in Table 7.

[Table 7] Here, if the operator determines that an input error has occurred in the verify mode based on the input data, the operator deletes the input error portion and further inputs a correct numerical value and an operator “4+”. The display unit 16 displays the information as shown in Table 8.

[Table 8] The calculator 10 displays the table 8 and, at the same time, continues the check performed so far.

Conversely, if an input error such as "44+" has occurred in the previous input and a correct input of "4+" has been performed in the verify mode, the calculator 10 similarly generates and emphasizes an alarm sound. Display. Here, when the operator determines that an input error has occurred in the previously input mathematical expression based on the input data, the operator presses a “VER” key to put the calculator 10 in a state of waiting for a correction input to the previously input mathematical expression. Migrate. Next, when the correct numerical value and the operator “4+” are input, the calculator 10 performs the display shown in Table 8 on the display unit 16 and at the same time,
The process returns to the state where the checking performed previously is continued (step S3).

Next, an input error occurs, for example, “5 ×”
Is entered, the correct numerical value and operator “5
Therefore, as in step S3, the generation of an alarm sound and the highlighting as shown in Table 9 are performed.

[Table 9] Here, as in step S3, if the operator determines that an input error has occurred in the verify mode based on the input data, the operator deletes the input error portion and further inputs a correct numerical value and operator "5+". The display unit 16 displays as shown in Table 10.

[Table 10] The calculator 10 displays the table 10 and, at the same time, continues the check performed so far.

Conversely, if an input error such as “5 ×” has occurred in the previous input and a correct input of “5+” has been performed in the verify mode, the calculator 10 similarly generates an alarm sound and Perform highlighting. Here, when the operator determines that an input error has occurred in the previously input mathematical expression based on the input data, the operator presses a “VER” key to put the calculator 10 in a state of waiting for a correction input to the previously input mathematical expression. Migrate. Then
When the correct numerical value and the operator “5+” are input, the calculator 10
Returns to the state where the display shown in Table 10 is performed on the display unit 16 and the checking that has been performed is continued (step S4).

Next, the key operation of "6 =" is performed. If there is an input error, the same operation as in step S3 or S4 is performed. If there is no input error, as shown in Table 11 below,
The calculation result “21” is displayed.

[Table 11] Note that if a correction was made to the previously entered formula, the calculator 10
In Table 11, the result of the recalculation by the correction input is displayed in the lower part of Table 11. When the calculation result is displayed by pressing the “=” key, the check is automatically terminated, and the mode shifts to the normal calculation mode.

In a conventional calculator having an answer check function, if the check result does not match the calculation result, the place where an input error has occurred is not known. Therefore, it is necessary to re-input a new value and recalculate. In the calculator 10 of the present invention, on the other hand, when a new expression is entered in the verify mode and a mathematical expression that does not match the previous input is entered, the alarm sound and highlighted display indicate that the input error has occurred. Is done. Therefore, the operator can always perform the recalculation or recalculation by one new input without monitoring the display unit 16.

It should be noted that the configuration of the above-described embodiment is merely an example, and the desk-top electronic calculator of the present invention is not limited to the configuration of the above-described embodiment. Modified and changed calculators are also included within the scope of the present invention. For example, the calculator of the present invention is not limited to a calculator for four arithmetic operations, and can be applied to a scientific calculator.

[0029]

As described above, the calculator according to the present invention can detect a portion where an input error has occurred in a mathematical expression. Therefore, verification or correct calculation can be performed reliably in a short time.

[Brief description of the drawings]

FIG. 1 is a plan view showing the appearance of a calculator according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a calculator according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 Calculator 11 Frame 12 Keyboard 13 Bus 14 Storage unit 15 Operation unit 16 Display unit 17 Alarm unit 18 Photovoltaic conversion panel for solar cell 19 Switch 20 First display unit 22 Second display unit

Claims (4)

[Claims] 1. A keyboard for inputting a mathematical expression, a storage unit for storing a mathematical expression entered by a key, an arithmetic unit for performing an arithmetic operation in accordance with the mathematical expression entered by a key, and a first displaying a mathematical expression newly input A desktop electronic calculator comprising: a display unit; and a second display unit that displays a previously input mathematical expression in response to a new input. 2. The desk-top electronic calculator according to claim 1, further comprising an alarm unit that issues an alarm when a mismatch between the first display unit and the second display unit is detected. 3. The desktop electronic calculator according to claim 1, wherein the first display unit and the second display unit are arranged in two stages. 4. A desktop electronic calculator which stores a previously input mathematical expression and issues an alarm when there is a mismatch between the newly input mathematical expression and the previously input mathematical expression.