HP 35s HP 35s scientific calculator - User Guide - Page 164
The Representation of Numbers, Negative Numbers
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b Changes to base 2; BIN annunciator on. This terminates digit entry, so no is needed between the numbers. Result in binary base. Result in hexadecimal base. Restores decimal base. The Representation of Numbers Although the display of a number is converted when the base is changed, its stored form is not modified, so decimal numbers are not truncated - until they are used in arithmetic calculations. When a number appears in hexadecimal, octal, or binary base, it is shown 36 bits (12 octal digits or 9 hexadecimal digits). Leading zeros are not displayed, but they are important because they indicate a positive number. For example, the binary representation of 12510 is displayed as: 1111101b which is the same as these 36 digits: 000000000000000000000000000001111101b Negative Numbers The leftmost (most significant or "highest") bit of a number's binary representation is the sign bit; it is set (1) for negative numbers. If there are (undisplayed) leading zeros, then the sign bit is 0 (positive). A negative number is the 2's complement of its positive binary number. Keys: Display Description: Enters a positive, decimal number; then converts it to hexadecimal. 11-6 Base Conversions and Arithmetic and Logic