JPH0155503B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides a compact electronic calculator, etc.
The present invention relates to a character expression processing device capable of converting expressions containing characters.

In recent years, small electronic calculators have become more sophisticated, and in addition to calculating functions such as trigonometric functions and exponential functions, models that can perform relatively complex function calculations such as numerical integration and differential equations have become commercially available. .

However, this type of system only performs numerical calculations, and cannot even calculate expressions that include characters. Furthermore, although completely new systems for processing character expressions are being researched for large electronic calculators, it is impossible to apply them to very small electronic calculators due to their complex configuration, large size, and high cost. It is.

The present invention has been made in view of the above-mentioned points, and its purpose is to provide a character expression processing device that can process character expressions with a simple configuration and is applicable to small electronic calculators. Our goal is to provide the following.

Hereinafter, the present invention will be specifically explained based on an embodiment shown in the drawings. In this embodiment, an example is shown in which an indefinite integral is executed as processing of a character expression. FIG. 1 shows the external appearance of a small electronic calculator to which this embodiment is applied. This small electronic calculator has a numeric keypad □0 to □9, a decimal point key □・, four arithmetic operation keys □÷,
In addition to □×, □-, □+, equal key □=, sign change key □+, and clear/all clear keys C/AC, various keys are provided for inputting predetermined character expressions. In other words, the key □∫ to specify the integral symbol, the key □x to specify the variable x, the key dx to specify the minute change in x, and the data A.
Key A ⁿ to specify the n-th power of
A, the key sin to specify the sine, the key cos to specify the cosine, the key tan to specify the tangent, the key □ (and □) to specify the cut, the key log to specify the common logarithm,
Key to specify input of variables (a, b, c, n) □F
has. The numeric keypad □9 is also used as a key to specify variable a, the numeric keypad □6 is variable b, the numeric keypad 3 is a variable c, and the decimal point key □・ is used as a key to specify variable n. After operating key □F, numeric keypad □9 ,□6,□3
,
By operating the decimal point key □・, variables a, b,
It is possible to input c and n. Note that FIG. 1 shows a state in which a character formula (calculation formula for an indefinite integral) is digitally displayed on a display device. Here, the display "↑4" represents the power of "4".

FIG. 2 is a system configuration diagram showing the main parts of the small electronic calculator. The keyboard 1 scans the operation keys according to the sampling signal given from the timing circuit 2, outputs a key code corresponding to the operation key and gives it to the input circuit 3, and outputs a key presence signal for each key operation. It is given to the control circuit 4. The input circuit 3 has an input register, a key encoder, and a display register, encodes the key code from the keyboard 1, outputs input data corresponding to the operation keys, and outputs the input data corresponding to the operation keys via the gate circuit G1.
In addition to supplying data to the data memory 5, "A ⁿ =-1",
“dx” and “∫” signals are output and supplied to the control circuit 4. Note that the "A ⁿ = -1" signal is a signal that is output when the key A ⁿ is operated, then "1" is entered, and then the key □± is operated, and "dx"
The signal is a signal that is output when the key dx is operated, and the "∫" signal is a signal that is output when the key □∫ is operated.

In addition, the control circuit 4 issues a key input command and gives it to the keyboard 1 when the power is turned on, waits for a key presence signal to be given from the keyboard 1, and outputs a key judgment command to receive the key presence signal and outputs a key judgment command to the input circuit. 3, and judges the "A ⁿ =-1", "dx", and "∫" signals sent from the input circuit 3. The control circuit 4 also issues a gate signal to open the gate circuit G1 every time a key presence signal is given from the keyboard 1, in other words, a write command to write the input data from the input circuit 3 into the data memory 5. Output. Furthermore, the control circuit 4 outputs a characterization command and gives it to the conversion circuit 6 as an operation command.

The conversion circuit 6 is also given a “∫” signal from the input circuit 3. Then, the conversion circuit 6 determines whether the data sent from the data memory 5 is a numerical value, and if it is a numerical value, the characters a,
The data is converted into b and c data, and the numerical value after the data corresponding to key A ⁿ is converted into character n data and converted into characters. And the conversion circuit 6
If the data sent from the data memory 5 is a character, it is sent as is to the character memory 7, and if it is a number, it is converted into characters and sent to the character memory 7, and the value is sent as is to the variable memory 8. . The data written in these character memory 7 and variable memory 8 are given to a character expression processing circuit 9.

When this character expression processing circuit 9 receives an integration command from the control circuit 4, it reads and integrates the data from the character memory 7 and the variable memory 8, provides the resulting data to the input circuit 3, and executes the integral calculation.・It outputs a FOUND signal indicating failure and an error signal and gives them to the control circuit 4. Further, the character expression processing circuit 9 outputs data indicating the type of variable and supplies it to the variable memory 8. Note that the result data output from the character expression processing circuit 9 is sent from the input circuit 3 and output for display.

Further, the timing circuit 2 outputs system clocks φ ₁ and φ ₂ and a clock WP necessary for transferring data between predetermined registers.

Next, details of the conversion circuit 6 will be explained with reference to FIG. Data from data memory 5 is provided to decoder 6-1. This decoder 6-1 operates upon being given a character conversion command from the control circuit 4, and decodes data from the data memory 5. That is, the decoder 6-1 uses the data memory 5
When the data from is numeric, signal d ₁ , key
When the data corresponds to A ⁿ , the signal d ₂ is output, and when the data is other than numerical values, the signal d ₃ is output, and the input data is output as data D.

The signal d ₁ is applied as an increment signal INC to a quaternary counter 6-3 via an AND gate 6-2. Each time the increment signal INC is applied to the quaternary counter 6-3, the contents are sequentially counted up as "1", "2", and "3", and the corresponding signals "1" and "2" are counted up. ”, “3”
Output the corresponding AND gates 6-4 to 6-6
to be established. Thus, when the content of the quaternary counter 6-3 is "1", the signal _d1 from the decoder 6-1 is applied as a gate control signal to the gate circuit G6-1 via the AND gate 6-4. As a result, the code for the character a generated by the code generation circuit 6-7 is sent to the character memory 7 via the gate circuit G6-1 and stored at a predetermined address in the character memory 7. In addition, the quaternary counter 6-3
When the content of is "2", the signal _d1 from the decoder 6-1 is given as a gate control signal to the gate circuit G6-2 via the AND gate 6-5.
As a result, the code for the character b generated by the code generation circuit 6-8 is sent to the character memory 7 via the gate circuit G6-2 and stored at a predetermined address in the character memory 7. Similarly, the quaternary counter 6
- When the content of 3 is "3", decoder 6-1
The signal d ₁ from the gate circuit G6-3 is applied as a gate control signal to the gate circuit G6-3 via the AND gate 6-6. As a result, the code for the character C generated by the code generation circuit 6-9 is sent to the character memory 7 via the gate circuit G6-3 and stored at a predetermined address in the character memory 7. That is, if the data from the data memory 5 is a numerical value, the numerical value is converted into codes a, b, and c in the order in which it is input, and converted into characters. Therefore, in this embodiment, even if one character expression contains a maximum of three numerical values, it is possible to convert it into characters.

In addition, the signal d ₂ output from the decoder 6-1
is applied to the set input terminal S of the SR type flip-flop 6-10.
This is a signal to set 10. The reset output of flip-flop 6-10 is applied to AND gate 6-2, and its set output Q is applied to AND gate 6-11 as a gate control signal. After the flip-flop 6-10 is set, the signal _d1 output from the decoder 6-1 is applied to the gate circuit 6-4 via the AND gate 6-11 to open it. As a result, the code for the character n generated by the code generation circuit 6-12 is sent to the character memory 7 via the gate circuit G6-4 and stored at a predetermined address in the character memory 7. Therefore, the numerical value input after operating the key A ⁿ is converted into a code of the character n and encoded. At the same time, the code of the letter n of the code generating circuit 6-12 outputted from the gate circuit G6-4 is supplied to the OR gate 6-13, and
-Reset 10.

Further, the signal _d3 outputted from the decoder 6-1 is given to the gate circuit G6-5 as a gate control signal, and is a signal for opening the gate circuit G6-5. As a result,
Data D output from the decoder 6-1 is sent to the character memory 7 via the gate circuit G6-5 and stored at a predetermined address in the character memory 7.
Therefore, characters other than numerical values are stored in the character memory 7 as they are.

On the other hand, data D output from the decoder 6-1
is sent to variable memory 8 and written. In this case, the output signals of the AND gates 6-4 to 6-6 and 6-11 are applied to the variable memory 8 as designation signals that designate the types of variables a, b, c, and n. By giving this designation signal to the variable memory 8, the numerical data D output from the decoder 6-1 is stored in the predetermined address of the variable memory 8 for each variable a, b, c, n according to the designation signal. written to.

Next, details of the character expression processing circuit 9 will be explained with reference to FIG. In addition, FIG. 4 shows the character expression processing circuit 9.
In addition to , variable memory 8 is also shown. 9-1 in the diagram
is a dictionary memory, which includes a derivative memory 9-1A and a primitive function memory 9-1B.

This dictionary memory 9-1 stores in advance the contents as shown in FIG. That is, in FIG. 5, the left column shows the memory contents of the derivative function memory 9-1A, and the right column shows the memory contents of the primitive function memory 9-1B.
It shows the memory contents of. For example, derivative memory 9-1A contains 23 types of character expressions a, x, ax, x.
↑n...e↑(ax), a↑x are memorized,
The primitive function memory 9-1B also contains the corresponding character expressions obtained by integrating the character expressions of the derivatives described above, that is, ax, 1/2x↑2, a/2x↑2, 1/n+1x
↑n+1...1/ae↑(ax), 1/loga a ↑
x is memorized.

The contents of the derivative memory 9-1A are written into the buffer 9-2 and then supplied to the comparison circuit 9-3 as data to be compared. This comparison circuit 9-
3 is supplied with the contents read from the character memory 7 as comparison data via a buffer 9-4. And the comparison circuit 9-3 is an AND gate 9-
It operates according to the comparison command output from 5,
Derivative function memory 9 written in buffer 9-2
-1A and the contents of the character memory 7 written in the buffer 9-4, a signal is output indicating whether the contents match or do not match.

The AND gate 9-5 receives the integral command output from the control circuit 4 via the inverter 9-6, and outputs the set output Q of the flip-flop 9-7 and the clock WP set by the integral command. The above comparison command is output by each input.

Moreover, the integral command output from the control circuit 4 is
It is applied to the reset input terminal R of address register 9-8. This address register 9-8 is incremented by +1 in accordance with the mismatch signal output from the comparison circuit 9-3, and its contents are supplied to the dictionary memory 9-1 as address designation data. Note that the dictionary memory 9-1 is configured such that the same address of its derivative memory 9-1A and primitive function memory 9-1B is specified simultaneously according to the contents of the address register 9-8.

The match signal output from the comparison circuit 9-3 resets the flip-flop 9-7 via the OR gate 9-9, thereby stopping the comparison operation of the comparison circuit 9-3. At the same time,
The above coincidence signal is given to the R/W (read/write) control circuit 9-10 as a START command, and the R/W (read/write) control circuit 9-10 is given the START command.
At the same time as starting the operation of the W control circuit 9-10, the signal is applied to the gate circuit G9-1 as a gate control signal to open the gate circuit G9-1. Therefore, the contents of the primitive function memory 9-1B addressed by the address register 9-8 are as follows:
A register 9-11 via gate circuit G9-1
sent to. At this time, the R/W control circuit 9-10
is given the above START command.
Outputs FOUND signal and A register 9-11
It outputs a write signal to the clock and outputs address data synchronized with clock _φ1 . As a result, the contents of the primitive function memory 9-1B are written and stored one digit at a time according to the address data. The contents written to this A register 9-1B are transferred from the R/W control circuit 9-10 to the A register 9-1B.
1 according to the read signal output to 11 and address data synchronized with clock _φ1 .
The data is read out digit by digit and supplied to the judgment circuit 9-12, and the contents of the A register 9-11 are supplied to the B register 9-13 via the gate circuit G9-1.

The above judgment circuit 9-12 is the R/W control circuit 9-1.
The contents of the A register 9-11 are sequentially judged digit by digit in accordance with the judgment command output from 0, and as a result of that judgment, it is determined whether the contents of the A register 9-11 are variables or something else. Therefore, in addition to outputting variables and other judgment signals, when the contents of the A register 9-11 are variables, it judges the type of the variable, that is, a, b, c, n, and outputs the judgment result (of the variable). type data). This variable type data is supplied to the variable memory 8, which causes the variable memory 8 to output numerical data corresponding to the variable type. This numerical data is gate circuit G9-
3 to the B registers 9-13. Therefore, the gate circuit G9-2 is determined by the judgment circuit 9-
The gate circuit G9-3 is opened by another judgment signal outputted from the judgment circuit 9-12, and the gate circuit G9-3 is opened by a variable judgment signal outputted from the judgment circuit 9-12. Also, B registers 9-13 are R/
Write signal output from W control circuit 9-10 to B register 9-13 (A register 9-11
(synchronized with the read signal output to)
Then, data selectively outputted from gate circuits G9-2 and G9-3 in accordance with address data synchronized with clock _φ1 is sequentially written and stored.
Therefore, the content written to the B register 9-13 is the content of the variable memory 8, that is, the numerical value substituted into the variable of the primitive function formula read from the primitive function memory 9-1B. This B register 9-
The contents written in 13 are supplied to input circuit 3 and then displayed.

However, when the contents of the character memory 7 and the contents of the dictionary memory 9-1, that is, the contents of the derivative memory 9-1A do not match even when the final expression of the dictionary memory 9-1 is obtained, the address register 9-8 is A carry signal is output. The carry signal output from the address register 9-8 resets the flip-flop 9-7 via the OR gate 9-9 to stop the comparison operation of the comparison circuit 9-3, and is output to the control circuit 4 as an error signal. be done.

Next, the operation of the above embodiment will be explained. Regarding key operations, normal calculations are performed as usual, and integral calculations are performed by pressing the key □∫, then inputting a function, and finally pressing the key dx. For example, to enter ∫2 (1.5x + 3) ⁴ dx as an integral calculation formula that includes a numerical value, operate the keys in the following order.

□∫ □２ □（ □１ □・ □５ □x □＋ □
3 □)
A ⁿ □4 dx In addition, when inputting ∫a(bx+c) ⁿ dx as an integral calculation formula that does not include numerical values, operate the keys in the following order.

□∫ □a □( □b □x □＋ □c □) A ⁿ
□n
dx First, the overall basic operation will be explained according to the flow shown in FIG. In step _S1 , the control circuit 4 outputs a key input wait command to the keyboard 1 when the power is turned on, and in the next step S2, the control circuit ₄ enters a key input wait state. The control circuit 4 is connected to the keyboard 1
When a key presence signal is received from the input circuit ₃ , the process moves to step S3, and a key determination command is output to the input circuit 3. Here, when the input circuit 3 receives the key determination command, it encodes the key code from the keyboard 1. Then, in step _S4 , the control circuit 4 determines the pressed key based on whether or not the "dx" signal and the "∫" signal are sent from the input circuit 3, and determines whether the pressed key is □∫. If so, next step S ₅
If it is dx, it is an error, and if it is any other key, it is not an integral calculation, so move on to other processing.

Then, the control circuit 4 sequentially executes steps _S5 to _S7 , which are similar to steps _S1 to _S3 described above, in order to determine the next key to be pressed.

Next, the process proceeds to step _S8 , where the control circuit 4 determines which key is pressed depending on whether or not the "dx" signal is sent from the input circuit 3. If the key dx is not pressed, the integral calculation formula is changed. This is in the middle of inputting, and the process advances to the next step _S9 . If the key is pressed, the input of the integral calculation formula is complete, and the process advances to step _S11 . Also,
In step _S8 , when the key A ⁿ is pressed, then the key □1 is pressed, and then the key □± is pressed, that is, when the "A ⁿ =-1" signal is output from the input circuit 3, an error occurs. treated as such. Note that this error processing is carried out according to the state of the "A ⁿ " flag, which is provided inside the control circuit 4. In other words, when you want to input 1/x, x
If you enter -1, the denominator will be "0" for 1/x+1.
This is treated as an error because it causes the following inconvenience. Therefore, when inputting 1/x, □x
You have to input it by operating keys like 1/A.

Then, in executing step _S9 , the control circuit 4 outputs a write command to the data memory 5. As a result, gate circuit G ₁ is opened and input data from input circuit 3 is written into data memory 5 . Next, the process proceeds to step _S10 , where a characterization command is output to the conversion circuit 6, and then the process returns to step _S5 , where it waits until the next key input (step _S6 ). During this time, the conversion circuit 6 performs characterization processing and writes the character expression into the character memory 7 and the variable into the variable memory 8.

Thus, steps _S5 to _S10 are repeatedly executed until the input circuit 3 outputs the "dx" signal. Then, in step _S8 , “dx”
When a signal is detected, an integration command is output to the character expression processing circuit 9 in step _S11 . The character expression processing circuit 9 that receives this integration command executes integration, and outputs a FOUND signal if the integration is successful, and an error signal if it is not possible. Next, the process advances to step _S12 , and waits until the FOUND signal and error signal arrive. When the error signal arrives, error processing is performed. When the FOUND signal is received, the process advances to the next step _S13 , where the character expression processing circuit 9 executes the process. Display the integrated result data.

Next, the operation when executing ∫2(1.5x+3) ⁴ dx will be explained. When the above formula is input from the keyboard 1, the input data is written into the data memory 5 in the order in which it was input, as shown in FIG.

In this way, the data written in the data memory 5 is read out in the order in which it was written and sent to the conversion circuit 6. At this time, in the conversion circuit 6, the quaternary counter 6-3 is reset by the "∫" signal from the input circuit 3, and its content becomes "0". In this state, first, when data "2" is sent from the data memory 5, the decoder 6--
1 outputs the signal _d1 , and the quaternary counter 6-3
The content of is incremented to "1" and the AND gate 6-4 is opened. Therefore, the gate circuit G6-1 is opened by receiving the signal _d1 from the decoder 6-1 via the AND gate 6-4. As a result, the code for the character a is written into the character memory 7 in place of the data D of "2" output from the decoder 6-1. Then, the next data sent from the data memory 5 is not a numeric digit but a cutoff "(" data, so a signal _d3 is output from the decoder 6-1, and the gate circuit G6-5 is opened. Therefore, decoder 6-
The data D of "(" output from 1 is written as is into the character memory. Similarly, the next data is the numerical value of "1.5", so it is written again to the decoder 6-1.
A signal _d1 is output from the counter 6-3, and the contents of the quaternary counter 6-3 are incremented to "2". Therefore, the code for the character b is written into the character memory 7 instead of the numerical value "1.5". Then, the next data is "x", and the next data is "+", so it is left as is, and the next data is "3", so instead of the code for the letter C, the next data is ")". ”
Therefore, the characters are sequentially written into the character memory 7 as they are. When the data "A ⁿ " is sent, the decoder 6-1 outputs the signal d ₂ and the flip-flop 6-10 is set. the result,
The next sent numerical data "4" is converted into a code for the character n and written into the character memory 7.
Therefore, in the character memory 7, ^as shown in FIG.
It is converted into characters and written to n.

On the other hand, in the variable memory 8, as shown in FIG. 7, variables 2, 1.5,
Only 3 and 4 are written.

The contents of character memory 7 and variable memory 8 are then supplied to character expression processing circuit 9.

Next, the integration process of the character expression processing circuit 9 will be explained. Note that the clock WP is the derivative memory 9-
1A, primitive function memory 9-1B, buffer 9-
2, 9-4, character memory 7, variable memory 8, and B registers 9-14 and 9-16 all have the same capacity, and this is the time clock necessary to transfer data between these registers. For example, to transfer one digit, clocks φ ₁ , φ ₂ (time T ₁ ), φ ₁ , φ ₂ (time
Since one machine cycle of T ₂ ) is required, if each of the above registers has 24 digits, 24 machine cycles will be one cycle of the clock WP.

When an integration command is output from the control circuit 4, the contents of the address register 9-8 are reset and the first equation in the derivative memory 9-1A is designated. This first
The formula is read out to buffer 9-2. At this time, the first equation is read out to the buffer 9-2 over one word time of the clock WP. The flip-flop 9-7 is then set by the output of the integration command, and a comparison command is output from the AND gate 9-5 in synchronization with the next clock WP after the output of the integration command. As a result, the comparator circuit 9-3
Compare the contents of -2 and 9-4 and output a match signal or a mismatch signal. In this case, Batsuhua 9-2
The content of is "a", the content of Batsuhua 9-4 is "a"
(bx+c)A ⁿ n'', a mismatch signal is output, and the contents of address registers 9-10 are incremented. Thereafter, the same operation is repeated, and when the sixth equation, ie, "a(bx+c)A ⁿ n" is read out from the derivative function memory 9-1A, the coincidence signal rises, and the primitive function memory 9-1A at this time is read out. The contents of 1B (the equation obtained by integrating the sixth equation) are written into the A register 9-11 (see FIG. 8, 1).

Here, the operation of the R/W control circuit 9-10 will be explained. R/W control circuit 9-10 is comparison circuit 9-3
When it receives a match signal (START signal) from the A register 9-1, it outputs a WRITE signal to the A register 9-1 for one word cycle time of the clock WP, and also outputs address data synchronized with the clock _φ1 . As a result, the formula shown in FIG. 8 is written into the A register 9-14. Then, at the next clock WP, a READ signal is output to the A register 9-11, and address data is output in the same manner as above. As a result, the contents of A registers 9-11 are read. At the same time, the R/W control circuit 9-10 sends the WRITE to the B register 9-13.
It outputs a signal and also outputs address data synchronized with clock _φ1 . In addition, the R/W control circuit 9-10 has the following information for the B register 9-13:
In the cycle to output the WRITE signal, the clock _φ1
Outputs a judgment command that is synchronized with. Therefore, each time the judgment command is given, the judgment circuit 9-12 sends out a judgment output indicating whether the input data is a variable or something else.

In this way, by operating the R/W control circuit 9-10, the judgment circuit 9-12
-11 is sequentially determined, variables a to n are replaced with the contents of variable memory 8, and the others are written as they are to B register 9-13 (see FIG. 8, 2).

Therefore, the input formula ∫2(1.5x+3) ⁴ dx is integrated to become 2/(1.5×(4+1))
It is displayed as ×(1.5x+3)↑(4+1).

As described above, in this embodiment, the input character expression and the derivative expression stored in the derivative memory 9-1A are compared, and when they match, the primitive function corresponding to the derivative expression is Since the expression is read from the primitive function memory 9-1B, it becomes possible to integrate the input character expression. In addition, when the input character expression contains a numerical value, the conversion circuit 6 converts the numerical value into a character expression and converts it into a character expression that does not include the numerical value, and the converted character expression and the contents of the derivative memory 9-1A are When they match, the primitive function corresponding to the derivative is stored in the primitive function memory 9-1B.
Then, among the read primitive function expressions, the characters converted from numerical values to characters by the conversion circuit 6 are converted to the numerical values before conversion, so even character expressions containing numerical values can be integrated. be able to.

Note that although the above embodiment has been described using an example in which an indefinite integral is executed, the present invention is not limited to this, and can be applied to calculations such as differential factorization using the same principle, for example. In this case, the contents of the dictionary memory may be changed to apply to differentiation, factorization, etc.

Moreover, if it also has a numerical integral calculation function, it will become even more convenient.

As explained in detail above, in the case where an input character expression includes a numerical value, the numerical value is converted into a character representing a variable to create a character expression that does not include a numerical value, and this character expression is stored in advance. When they match, the corresponding expression stored in correspondence with the corresponding expression is read out, and the characters representing variables in the corresponding expression are replaced with the original numerical values and output. With this configuration, it is possible to process not only character expressions that do not contain numbers, but also character expressions that include numbers, resulting in the effect of greatly expanding the processing range of character expressions. .

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an external plan view of a character processing device, Fig. 2 is a diagram of the overall system configuration, and Fig. 3 is a diagram of the conversion circuit shown in Fig. 2. 4 is a block diagram of the character expression processing circuit shown in FIG. 2, and FIG. 5 is a diagram showing the storage state of the dictionary memory (derivative function memory and primitive function memory) shown in FIG. 4. Figure 6 is a general flowchart of the entire system, Figure 7 is a register state diagram when executing ∫2 (1.5x + 3) ⁴ dx, Figure 1 is the data memory, Figure 2 is the character memory, Figure 3 is the FIG. 8 is a register state diagram that is a continuation of FIG. 7, and FIG. 1 shows the state of the A register, and FIG. 2 shows the state of the B register. DESCRIPTION OF SYMBOLS 1...Keyboard, 3...Input circuit, 4...Control circuit, 5...Data memory, 9...Character processing circuit, 9
-1...Dictionary memory, 9-3...Comparison circuit, 9-15
...judgment circuit.

Claims (1)

[Scope of Claims] 1. An input means for inputting a character expression, a storage means for storing a plurality of character expressions and corresponding expressions corresponding to the character expressions, and when the character expression input by the input means includes a numerical value. a converting means for converting the numerical value into characters representing a variable and outputting a character expression that does not include the numerical value; a numerical storage means for storing the numerical value converted into the character by the converting means; and output by the converting means. a comparison means for detecting a match or mismatch between the character expression obtained by the character expression and the character expression stored in the storage means; and means for replacing characters representing the variables in the correspondence equation read by the reading control means with numerical values stored in the numerical storage means and outputting the resultant characters. Processing equipment.