JP5304191B2 - Fraction display device - Google Patents

Description

  The present invention relates to a fraction display device for displaying a fraction on an electronic calculator having a fractional expression calculation function.

  2. Description of the Related Art Conventionally, in an electronic calculator called a calculator, a numerical expression entered by a user and a notation form of the calculation result are a segment expression in which each digit is displayed in an 8-character form. Many items were displayed.

  For example, in the case of a mathematical expression including a fraction, since the numerator and denominator sandwiching the fraction symbol (hereinafter referred to as “secant”) cannot be displayed naturally in the vertical direction, “A” for B is usually “A”. B], “B of A and C”, which is a mixed number, is displayed as a single line, such as [A ”B” C].

Therefore, a calculator equipped with a dot matrix type display screen has been considered, in which the numerator and denominator of the fractional expression are displayed in a natural format as described in a textbook with the secant line as the boundary. (For example, refer to Patent Document 1 and Patent Document 2.)
JP 2008-146289 A JP 2006-004326 A

  In the above-mentioned conventional calculator, for example, when editing the mathematical formula, for example, by removing the dividing line of the fraction part “3/4” in the input mixed fraction “2 and 3/4” and removing it as a fraction, an integer If the part [2], the numerator part [3] from which the secant line is deleted, and the denominator part [4] are simply continued, [234] and a large number of digits, an unnatural difference from the original mixed number There is a problem that becomes a numerical value.

  Also, for example, in the input formula [2 + 34], when the cursor is positioned between [3] and [4] and an operation for taking a fraction is performed, [2+] remains as it is, “2 plus 4 minutes” 3 ”, that is, [2 + 3] 4] in the one-line display and [2 + 3/4] in the natural display, and there is a problem that the immediately preceding integer part [2] cannot be taken in as one function (combined number).

  The present invention has been made in view of such a problem, and the first object is that when the dividing line of the mixed number is deleted, each numerical value after the integer part is simply continuously unnatural. It is another object of the present invention to provide a fraction display device that allows editing while leaving the integer part correctly.

  A second object is to provide a fraction display device that, when taking in fractions, can correctly capture and edit the integer part located in front of the import part and connected by [+]. .

  The fraction display device according to claim 1 is a mathematical expression input means for inputting a mathematical expression including a mixed number in accordance with a user operation, a mathematical expression display means for displaying a mathematical expression input by the mathematical expression input means, and the mathematical expression display. The dividing line deleting means for deleting the dividing line of the mixed number displayed by the means according to the user operation, and when the dividing line of the mixed number is deleted by the dividing line deleting means, the integer part of the mixed number is followed by And mathematical expression editing means for inserting an arithmetic symbol of “+” between the numerical part of the fraction from which the secant has been deleted.

  According to a second aspect of the present invention, there is provided the fraction display device according to a user operation, a mathematical expression input means for inputting a mathematical expression including an arithmetic symbol “+”, and a mathematical expression display means for displaying a mathematical expression input by the mathematical expression input means; The mathematical expression displayed by the mathematical expression display means is included in the mathematical expression when the capture instruction means instructs the capture of the mixed number in accordance with the user operation, and when the capture instruction means instructs the capture of the mixed number. The present invention is characterized in that it has a mixed number conversion means for converting a numerical value before “+” into an integer part and converting the subsequent numerical value into a fraction part.

  A fraction display device according to a third aspect of the present invention is the fraction display device according to the second aspect, further comprising a mathematical expression position designation means for designating an arbitrary position of the mathematical expression displayed by the mathematical expression display means in response to a user operation. The mixed number dividing means, when a numerical value after “+” included in the mathematical formula is designated by the mathematical formula position designating means, and when fetching of a mixed number is instructed by the capture instruction means, The numerical value before “+” is an integer part, and after “+”, the numerical value up to the numerical value specified by the mathematical expression position specifying means is converted into a mixed number with the numerator part and the subsequent numerical value as the denominator part. It is characterized by.

  According to the first aspect of the present invention, when the dividing line of the mixed number is deleted, each numerical value after the integer part is simply continuously edited, leaving the integer part correctly, and being edited. It is possible to provide a fraction display device that can be used.

  According to the present invention described in claim 2 or claim 3, when capturing a mixed number, it is possible to correctly capture and edit an integer part located in front of the capturing part and connected by [+]. A fraction display device can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a front view showing an external configuration of an electronic calculator (functional calculator) 10 according to an embodiment of a fraction display device of the present invention.

  The scientific calculator 10 has a small size that allows a user to hold it with one hand and operate with one hand because of its portability. A key input unit 11 and a display unit 16 are provided on the front surface of the main body of the calculator 10.

  The key input unit 11 is a numeric / arithmetic symbol key group 12 for inputting numerical values and mathematical formulas and instructing execution of calculations, and a function function for inputting various functions and for starting up a memory function. Key group 13, mode setting key group 14 for displaying menu screens of various operation modes and instructing setting of operation modes, moving operation of cursor Cu displayed on display unit 16, selection operation of data items, and the like Cursor keys 15 for performing functions and function keys F1 to F4 for selectively designating various functions displayed on the menu along the lower end of the display unit 16.

  The numerical value / operation symbol key group 12 includes “0” to “9” (numerical value) keys, “+”, “−”, “×”, “÷” (arithmetic symbol) keys, “Exp” (power function) keys, An “EXE” (execute) key, “DEL” (delete) key, “AC” (clear) key, and the like are arranged.

  As the function function key group 13, a “√” (root) key, an “a / b” (fraction) key, a “sin” (sign) key, an “M +” (memory plus) key, and the like are arranged.

  As the mode setting key group 14, a “Menu” key, an “Insert” key, a “Grph” key, a “Trac” key, and the like are arranged.

  In this embodiment, it is necessary to display using special symbols in one-line display such as “√” (root), “a / b” (fraction), “Exp” (power function), etc. Thus, in a natural display described in a textbook, a function that requires two-dimensional expansion of numbers and function symbols and a display that overlaps vertically is called a 2D (dimension) function.

  The display unit 16 is composed of a dot matrix type liquid crystal display unit.

  Whether the mathematical expression to be displayed on the display unit 16 is to be displayed naturally or on a single line is determined according to the display mode setting screen displayed from the operation of the “Menu” key, the mathematical natural display mode (Math I / O). Alternatively, it is selectively set by designating a calculator display mode (Line I / O).

  FIG. 2 is a block diagram showing the configuration of the electronic circuit of the scientific calculator 10.

  The electronic circuit of the scientific calculator 10 includes a CPU 21 that is a computer.

  The CPU 21 controls the operation of each circuit unit in accordance with a calculator control program stored in advance in a storage device 22 such as a ROM, and performs various arithmetic processes according to key input signals from the key input unit 11 using the RAM 23 as a working memory. Run.

  In the RAM 23, a display data memory 24, a cursor pointer memory 25, an input buffer 26, and the like are secured.

  In the display data memory 24, the mathematical expression data to be displayed on the display unit 16 and the calculation result data are stored in the mathematical natural display mode (Math I / O) or the calculator display mode (Line I / O). Accordingly, the bitmap data corresponding to the display area of the display unit 16 is expanded and stored.

  In the input buffer 26 (see FIGS. 4 and 6), key code data key-input by the key input unit 11 is sequentially stored. For example, a numeric key is a code indicating a number, a function key such as “sin” is a code indicating the function, and an arithmetic symbol key such as “+”, “−”, “×”, “÷” is a code indicating the arithmetic symbol. Remembered. Note that “MF” is a code indicating the head of the fractional expression stored in response to the input of the “a / b” (fraction) key that is a 2D function. The input buffer 26 stores a control code in addition to the code corresponding to the key. For example, in the code data shown in FIG. 4, “EZ” is a code indicating the end of the range where the fractional expression, which is the 2D function, is applied, and “EE” is a code indicating the end of the expression.

  The cursor pointer memory 25 (see FIGS. 4 and 6) 25 stores the key code data stored in the input buffer 26 and operates the cursor keys 15 for the key input data displayed on the display unit 16. The pointer data P indicating where the cursor Cu to be moved and displayed is located is stored.

  Next, a mathematical expression display / calculation function by the scientific calculator 10 having the above-described configuration will be described.

  FIG. 3 is a flowchart showing mathematical expression display / calculation processing by the scientific calculator 10.

  First, key data desired by the user is input in accordance with the key operation of the key input unit 11, and “Insert” (import input) key, “a / b” (fraction) key, “DEL” (delete) key, “EXE” In a state where it is determined that there is no (execution) key input, mathematical expression input processing corresponding to the input of the key data is executed and sequentially displayed on the display unit 16 (steps S1, S2 → S3 → S4). → S5 → S6).

  When it is determined that the “EXE” key has been operated in a state where an arbitrary mathematical expression is input and displayed (step S5 (Yes)), the key code data stored in the input buffer 26 is read out and is subject to calculation. It is checked whether there is a problem as a mathematical expression (step S7). If it is determined that there is a problem that cannot be calculated by the mathematical expression check in step S7, a syntax error is displayed. If there is no problem in the inputted mathematical formula, the calculation process is executed (step S8), and the data of the calculation result is displayed on the display unit 16 (step S9).

  For example, when the "Insert" key is operated and input in the state where the mathematical expression is input and displayed (step S2 (Yes)), the operation mode of the CPU 21 is set to the capture input mode (step S10). .

  If the “a / b” (fractional) key corresponding to the 2D function is operated (step S3 (Yes)), it is determined whether or not the capture input mode is set (step S11). . If it is determined that the capture input mode is not set (step S11 (No)), an integer part, numerator part, denominator part, or A fractional expression input process is performed in which the numerical values of the numerator part and the denominator part are divided and displayed in order (step S12).

  On the other hand, when it is determined that the capture input mode is set (step S11 (Yes)), an arithmetic symbol “+” immediately before the key code where the pointer data P (Cu) is located in the input buffer 26. It is determined whether or not the number can be divided according to whether or not there is a code (step S13).

  If it is determined that the number can be divided (step S13 (Yes)), the numerical value connected by “+” immediately before the numerical value at which the pointer data P (Cu) is located is represented by the integer part and the pointer data. A numeration process is executed in which the numerical value where P (Cu) is located is the numerator part and the immediately following numerical value is the denominator part, and the control code “MF” indicating the fractional expression is input at the head (step S14).

  On the other hand, if it is determined that the number cannot be divided (step S13 (No)), the numerical value where the pointer data P (Cu) is located is the numerator part and the immediately following numerical value is the denominator part. A fractionation process is executed by inputting the mathematical expression code “MF” (step S15).

  When the “DEL” (delete) key is operated and input (step S4), a fractional expression is shown in each code constituting a series of mathematical expressions where the pointer data P (Cu) is located in the input buffer 26. Whether there is a code “MF” and whether there is a code “,” that separates the integer part, it is determined whether or not it is an instruction to delete the mixed number expression (step S16).

  Here, when it is determined that the instruction is a deletion instruction for the mixed number mathematical expression (step S16 (Yes)), the position of the pointer data P (Cu) in the input buffer 26 is a secant dividing the numerator denominator. It is determined whether or not it is an instruction to delete the secant (step S17).

  If it is determined that the instruction is to delete the dividing line (step S17 (Yes)), the code is replaced with a code “,” that separates the integer part in the mixed number mathematical formula stored in the input buffer 26. Then, the arithmetic symbol code “+” is inserted, and the numerical value of the integer part is converted into a mathematical expression that is simply added. At the same time, the dividing line where the pointer data P (Cu) is located is deleted, so that the numerical values of the integer part are simply added and connected, and the numerical values of the numerator part and denominator part are arranged as upper and lower digits. It is converted into the normal formula (step S18).

  On the other hand, when the “DEL” (delete) key is operated and input (step S4 (Yes)), if it is determined that the instruction is not a delete instruction for the mixed number formula (step S16 (No)), the input is performed. The key code in the mathematical formula where the pointer data P (Cu) is located in the buffer 26 is simply deleted (step S19).

  FIG. 4 is a diagram showing a change in the storage state of the key code in the input buffer 26 when the dividing line of the divided mathematical expression is deleted by the mathematical expression display / calculation processing of the scientific calculator 10.

  FIG. 5 is a diagram showing an example of editing and displaying the mathematical expression in the mathematical natural display mode (Math I / O) accompanying the deletion of the dividing line of the segmented mathematical expression shown in FIGS. 4 (A) and 4 (B).

  In the state where the mixed fractional expression “2 and 3/4” as shown in FIGS. 4A and 5A is input and displayed, the cursor is used to convert the fractional expression into a normal mathematical expression. When Cu is set to the position of the dividing line and the “DEL” (delete) key is operated (step S4 (Yes)), a series of mathematical formula codes “MF” to “MF” in which the pointer data P (Cu) is located in the input buffer 26. , ”To“ / ”to“ EG ”, it is determined that it is a deletion process for the mixed number (step S16 (Yes)).

  Further, when the pointer data P (Cu) is at the position of the dividing line “/”, it is determined that it is an instruction to delete the dividing line (step S17 (Yes)).

  Then, as shown in FIG. 4B, in the mixed number mathematical formula stored in the input buffer 26, the operator code “+” is replaced with the code “,” that delimits the integer value “2”. Inserting and deleting the dividing line “/” where the cursor pointer P (Cu) is located results in the integer value “2” being simply added and connected, and the numerator “3” and the denominator “4”. The numerical value is converted into an ordinary mathematical expression “2 + 34” in which upper and lower digits are arranged. And it is displayed on the display part 16 as shown in FIG.5 (B) (step S18).

  Therefore, according to the mathematical expression display / calculation function by the scientific calculator 10 having the above-described configuration, for example, the dividing line “/” is deleted in the fractional expression “2 and 3/4” shown in FIG. In this case, the integer part “2”, the numerator part “3”, and the denominator part “4” are not simply connected to become an unnatural numerical value “234”, as shown in FIG. This is because the integer part “2” can be edited as a natural mathematical expression “2 + 34” in which “+” is connected as it is. For this reason, it becomes possible to understand the relationship between the integer part and the fractional part when the fraction of the mixed number is eliminated.

  FIG. 6 is a diagram showing a change in the storage state of the key code in the input buffer 26 accompanying the input processing of the “a / b” (fractional) key by the mathematical expression display / calculation processing of the scientific calculator 10.

  FIG. 7 shows an example of editing and displaying mathematical expressions in the mathematical natural display mode (Math I / O) accompanying the input processing of the “a / b” (fraction) key shown in FIGS. FIG.

  When an ordinary mathematical expression [2 + 34] as shown in FIG. 6A and FIG. 7A is input and displayed, if the “insert” key is operated and input to convert the mathematical expression into a mixed number (step) In S2 (Yes), the capture mode is set (step S10).

  When the cursor Cu is set to the position of “3” and the “a / b” (fraction) key is operated and input (step S3 (Yes)), it is determined that the fraction capture mode is set (step S11). (Yes)), the presence of the operator “+” immediately before the numerical value “3” at which the pointer data P (Cu) is located in the input buffer 26 is determined to be able to be divided (step S13 (step S13)). Yes)).

  Then, as shown in FIG. 6B, in the input buffer 26, a dividing line “/” is inserted between the numerical value “3” where the pointer data P (Cu) is located and the subsequent numerical value “4”. At the same time, the arithmetic symbol code “+” immediately before the numerical value “3” where the pointer data P (Cu) is located is rewritten to the code “,” for separating the integer part “2”. Then, the code “MF” of the fractional expression is input at the top of the mathematical expression, and is displayed on the display unit 16 as the fractional expression “2 and three-fourths” converted into a mixed number as shown in FIG. 7B. (Step S14).

  Therefore, according to the mathematical expression display / calculation function of the scientific calculator 10 having the above-described configuration, for example, in the normal mathematical expression “2 + 34” shown in FIG. 7A, the cursor Cu is set to “3” and a fraction is input. In this case, the numerical value “2” connected immediately before “+” is not left as it is, and the numerical value “2” is correctly set as an integer part as shown in FIG. 7B. It is now possible to generate fractional expressions for the captured fractions. For this reason, it is not necessary to newly generate a mixed number.

  In the above embodiment, for example, as shown in FIGS. 5 and 7, an example of editing and displaying a fractional expression in the mathematical natural display mode (Math I / O) has been described, but as shown in FIG. Even in the calculator display mode (Line I / O), the fractional expression can be edited in the same manner as described above.

  FIG. 8 is a diagram showing an example of editing and displaying mathematical expressions in the calculator-like display mode (Line I / O) accompanying the dividing line removal of the divided mathematical expressions by the mathematical expression display / calculation processing of the scientific calculator 10.

  For example, in the fractional expression “1 and 2/3” shown in FIG. 8A, the cursor Cu is placed between its numerator [2] and denominator [3] as shown in FIG. 8B. When the deletion instruction is issued by the “DEL” key in accordance with the division symbol [”], the integer part [1], the numerator part [2], and the denominator part [3] are simply connected and an unnatural numerical value“ 123 ”is obtained. As shown in FIG. 8C, it is possible to edit as a natural mathematical expression “1 + 23” in which the integer part [1] is directly connected by [+].

  Note that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation. Further, each of the embodiments includes inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in each embodiment or some constituent elements are combined in different forms, the problems described in the column of the problem to be solved by the invention If the effects described in the column “Effects of the Invention” can be obtained, a configuration in which these constituent requirements are deleted or combined can be extracted as an invention.

1 is a front view showing an external configuration of an electronic calculator (functional calculator) 10 according to an embodiment of a fraction display device of the present invention. FIG. 2 is a block diagram showing a configuration of an electronic circuit of the scientific calculator 10. 7 is a flowchart showing mathematical expression display / calculation processing by the scientific calculator 10; The figure which shows the memory | storage change state of the key code in the input buffer 26 accompanying the dividing line deletion of the division | segmentation formula by the numerical formula display of the said scientific calculator 10, and calculation processing. The figure which shows the example of an edit display of the numerical formula in the mathematical natural display mode (Math I / O) accompanying the dividing line deletion of the division | segmentation formula shown to the said FIG. 4 (A) (B). The figure which shows the memory | storage change state of the key code in the input buffer 26 accompanying the acquisition input process of the "a / b" (fraction) key by the numerical formula display and calculation process of the scientific calculator 10. FIG. 7 is a diagram showing an example of editing and displaying mathematical expressions in a mathematical natural display mode (Math I / O) accompanying the input processing of “a / b” (fraction) key shown in FIGS. 6A and 6B. The figure which shows the example of an edit display of the numerical formula in the calculator-like display mode (Line I / O) accompanying the dividing line deletion of the divisional mathematical formula by the mathematical formula display / calculation processing of the scientific calculator 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Scientific calculator 11 ... Key input part 12 ... Numerical value / arithmetic symbol key group 13 ... Function function key group 14 ... Mode setting key group 15 ... Cursor key 16 ... Display part 21 ... CPU
22 ... Storage device 23 ... RAM
24 ... Display data memory 25 ... Cursor pointer memory 26 ... Input buffer Cu ... Cursor P ... Pointer data

Claims (3)

Formula input means for inputting a formula including a mixed number in response to a user operation;
Formula display means for displaying the formula input by the formula input means,
A secant deleting unit that deletes the dividing line of the mixed number displayed by the formula display unit in response to a user operation;
When the dividing line of the mixed number is deleted by the dividing line deleting means, a mathematical expression that inserts an arithmetic symbol of “+” between the integer part of the mixed number and the numerical value part of the fraction from which the dividing line thereafter is deleted Editing means,
A fraction display device characterized by comprising: Formula input means for inputting a formula including an arithmetic symbol “+” in response to a user operation;
Formula display means for displaying the formula input by the formula input means,
With respect to the mathematical formula displayed by the mathematical formula display means, a capture instruction means for instructing capture of a mixed number according to a user operation;
In the case where the acquisition of the mixed number is instructed by the capturing instruction means, the mixed number converting means for converting the numerical value before “+” included in the mathematical expression into an integer part and converting the subsequent numerical value into a fractional part. When,
A fraction display device characterized by comprising: Formula position designation means for designating an arbitrary position of the formula displayed by the formula display means according to a user operation,
In the state where the numerical value after the “+” included in the mathematical expression is designated by the mathematical expression position designating means, and the capture instruction means instructs to capture the mixed number, The numerical value before “+” is an integer part, and after “+”, the numerical value specified by the mathematical expression position specifying means is converted to a mixed number with a numerator part and a subsequent numerical value as a denominator part.
The fraction display device according to claim 2.

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