A calculator is really a special purpose computer containing a number of fixed program routines which may be initiated by entering such commands as +, –, ×, ÷. Numerical data are entered for the programs to operate on. Since the calculator is essentially a special kind of computer, it has a similar internal structure. This structure is illustrated in Fig. 46.1.




Fig. 46.1 Basic calculator structure


Input Devices : The most common, input device to a calculator is keyboard. This is merely a group of keyswitches, each representing a digit or an operation, which will be understood by the calculator when a key is depressed. ...

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