Displayed Value vs Internal Storage
The accuracy of a calculating device is determined by the number of digits used for computations. To provide the precision required by a professional calculator, the RPD-95 stores all values internally to 13 digits.
The Numeric Display Register
Numbers that you see in the calculator's display are also stored internally in a special memory location called the numeric display register. As you use the numeric functions of the calculator, be aware that what you see in the display and what is stored internally can differ. The number of digits shown in the display depends upon the display format that you have selected.The numeric functions of the calculator, whether executed from the keyboard, or in a program, always use the value stored in the numeric display register. In most cases, the difference between a displayed value and the value stored internally is not important, because the internally stored value is used for subsequent calculations.
The possibility of different values can be important when numbers are compared in a program for decision-making purposes. For details on comparison tests, refer to Chapter 5 of the RPD-95 Programming Guide.
If you want to see the 13 digits stored internally in the numeric display register, use the [ 2nd ] [ 13d ] key sequence described in the section on Math Operations, Selecting the Format of Displayed Values. If you want to force the calculator to store the same value internally that is displayed, use the [ NUM ] { RND } key sequence described in the section on Math Operations, Integer Portion, Fractional Portion, and Rounding.
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