Abstract: It is an object of the invention to provide an electronic computing apparatus having an arithmetic processing function and an arithmetic processing method which allow an arithmetic expression to be readily inputted. A screen showing stored contents of an arithmetic expression menu table is displayed by specifying an arithmetic expression menu display command key. Then, selecting an arithmetic expression from the displayed plurality of arithmetic expressions by an input pen allows the selected arithmetic expression to be inputted. A controller executes arithmetic processing in accordance with the selected arithmetic expression and displays the result of the arithmetic processing as a graph on the display. Accordingly, the arithmetic expression may be readily inputted just by selecting the arithmetic expression from the predetermined plurality of arithmetic expressions.

Abstract: The present invention is intended to enable an electronic calculator device for calculating functions to display a mathematical expression by automatically substituting a variable-value into a variable therein in advance. An electronic device comprises an input device for inputting a mathematical expression containing a variable, a store device for storing a value of the variable and a display device for displaying a mathematical expression on a display screen. The electronic device is further provided with a converting device for reading a value for a variable contained in a mathematical expression from the store device and substituting the read-out value into the variable in the mathematical expression to be displayed on the display screen.

Abstract: The invention provides a calculator wherein it is possible to start an operation on the basis of an inputted formula and successively know the progress processes of operation until an operation result is obtained. An inputted formula edited on the basis of the data inputted from a keyboard is once displayed and the calculator is placed in the state of waiting for key entry. Then, when a Enter key is pressed down, only the operator codes selected among plural operator codes in the inputted formula in accordance with the priority order of operation are processed and a process formula as the result of the processing is displayed. Thereafter, every time the Enter key is pressed down, the operation is executed in accordance with the priority order and the process formulas obtained in the respective operations are successively displayed.

Abstract: A scientific calculator includes a conversion table memory for storing as a conversion table a combination of each kind of conversion equation and a selection number, a key board providing numeric keys and a specific key, a numeric value memory for storing the entered numeric values, a mode setting section for setting the current mode to a conversion mode, a designating section for designating the selection number during conversion mode, reading section for reading from the conversion table the conversion equation corresponding to the designated selection number, a conversion section for converting the numeric value stored in the numeric value memory from one unit to another on the basis of the read conversion equation, and a display section for displaying the converted numeric value.

Abstract: A scientific calculator capable of function calculation including: an input device for entering a numerical value and a functional formula; a calculation device for calculating two calculation result values based on the numerical value and the functional formula; a storage device for storing the numerical value entered and the calculation result values; a numerical value display unit for displaying one numerical value or one calculation result value; a guidance display unit for displaying a character and a symbol representing a calculation process and the meaning of the numerical value; a symbol display unit for displaying two types of display symbols indicating that, upon display of one of two calculation result values at the numerical value display unit, the other calculation result value is stored in the storage device; and retrieval device for retrieving, upon display of one of .

Abstract: A computer is provided which is a so-called arithmetic expression storing type computer and in which a constant calculation mode can be set without additionally installing a key and the function of the constant calculation mode has an enhanced ability. When a rightward cursor is operated under a state that a cursor is positioned at the digit rightward subsequent to an entered expression and a binary operator is entered at the last digit of the expression, an expression which has been entered before the operator is calculated, and the calculated result is scored as a constant. When the rightward cursor is operated again under a state that the constant calculation mode is set, the constant which has been set as a first operand is reset to a second operand. An expression set in the constant calculation mode is displayed on a display screen.

Abstract: An electronic computer of the invention adopts prefix unary operators, so that key operation for entering arithmetic or mathematical expressions is performed in the normal order of the operands and operators of the expression, and moreover the last calculation result can be directly used as the operand for the prefix unary operator. Therefore, sequential calculations can be performed step by step while checking the intermediate results by simple key operation.

Abstract: An electronic apparatus provided with a device of calculating complex numbers includes a keyboard for entering calculation data including a value and an imaginary number unit i, an LCD device for displaying a result of performed calculation of the complex numbers consisting of a real number and an imaginary number unit i, and a processing unit.

Abstract: A portable electronic computer for conducting fraction calculations has a display including a first multiple-digit display area for displaying the numerator of a fraction, and a second multiple-digit display area for displaying the denominator of the fraction. The numbers of digits of the numerator and denominator of a fraction to be displayed are obtained. The number of digits of the numerator is compared with the number of digits of the denominator. The difference between the number of digits of the numerator and the number of digits of the denominator is calculated. When the number of digits of the numerator is smaller than the number of digits of the denominator, the numerator is displayed on the first display area with its position shifted to an upper digit place according to the difference.

Abstract: A computer or calculator which can use a retrieved data in any position of an expression. The computer has a calculation mode and a data retrieval mode, and comprises an X register for an input data, and a Y register for an operand. In the computer, the contents of the X register is loaded into the Y register when a predetermined key operation is conducted in the calculation mode, and then the mode of the computer is set to the data retrieval mode. A retrieved data is loaded into the X register, and the mode of the computer returns to the calculation mode.

Abstract: In an electronic translator apparatus, synonymous phrases (title data) and sentences in plural languages are stored in correspondence to each other. These phrases or sentences are read out and translated. This electronic translator apparatus stores the title data as a basic phrase and the explanatory data relating to the title data, thereby allowing a wide range of translation. The title data can be translated into plural languages which are displayed simultaneously. The title data and corresponding sentences are separately stored, thereby increasing the number of sentences that can be translated. The display method is varied depending on the necessity. If the sentence to be translated is long, part of the original sentence during displaying is ommitted and the translated sentence is displayed in whole. When translating into English, an article may be added or a plural form may be expressed so as to translate properly.

Abstract: A computer having an algebraic expression reserve mode and a computation mode, and including an input key for commanding the execution of computations, the computer further including: a memory which stores an algebraic expression, if the input key is operated when the algebraic expression reserve mode has been set and the algebraic expression has not yet been stored; and a processor which conducts computations of an algebraic expression, if the input key is operated when the algebraic expression mode has been set and the algebraic expression has been stored.

Abstract: An improved electronic computer which can produce a quotient/remainder calculation. The computer has first and second memories for storing respectively a dividend and a divisor which are input for execution of division. A quotient/remainder calculation is carried out using the dividend and divisor stored respectively in the first and second memories. The computer further includes third and fourth memories for storing respectively a quotient and a remainder which are obtained in the division calculation. A detector is provided for detecting which of the contents of the third memory or the contents of the fourth memory are displayed. The contents of the third memory or the contents of the fourth memory which have not been detected as being displayed are displayed in response to a predetermined input operation.

Abstract: A calculator which can display not only numerical digits but also arithmetic operational signs and functional symbols. A display portion of the calculator has a numerical value display portion on its lower side and an expression display portion on its upper side, wherein a cursor appears only in the expression display portion. Any digit inputted from numerical keys is first displayed at the numerical value display portion, and such a digit is inputted into the expression display portion when a key for giving instructions to perform an operation is depressed. A CPU clears all of input numerical digits displayed at the numerical value display portion and shifts a cursor back to an end of a mathematical expression displayed at the expression display portion when a cursor-left-shift is operated. When a cursor-right-shift key is operated, the CPU deletes a digit located at the lowest position of the numerical value display portion.

Abstract: A multi-functional electronic desk calculator has numeral value keys for inputting a numeral value and a decimal point key for inputting a decimal point. The calculator also has a device for detecting depression of the numeral value keys to produce a first signal representative of being in a numeral value inputting mode, a device for detecting depression of the decimal point key to produce a second signal representative of input of the decimal point, a predetermined single key, and a device for operating the predetermined single key as a key used for inputting hexagesimal number when the first signal is produced and the second signal is not produced, and for operating the predetermined single key as a conversion key for performing conversion from decimal number to hexagesimal number when the first signal is not produced or when the second signal is produced.

Abstract: The desk-top calculator in accordance with the present invention comprises a constant access key, a ROM and a control unit. The ROM is arranged such that different types of constants are anteriorly stored therein and the constants are accessed through the operation of the constant access key. The control unit is arranged such that, as well as accessing successively the different types of constants stored in the ROM each time the constant access key is operated consecutively, after one of the contants is accessed through the operation of the constant access key, when another key is operated and the constant access key operated again thereafter, the control unit accesses the constant previously accessed in the first place.According to the arrangement described above, the operation of such a desk-top calculator is simplified and its operation efficiency is sharply improved.