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Integers are positive or negative whole numbers, or zero. Integer values within the range from -9,,,,,, -2 63 to 9,,,,,, 2 63 - 1 can be held in Analytica exactly, without any loss of precision. When an integer literal within this range is entered, it is stored as an integer value, and results of integer arithmetic operations result in integer results, as long as the operands do not involve non-integer values, or potentially non-integer values.
Once an operation is encountered that involves a floating point number or would be expected to produce a floating point number, resulting values are stored as bit floating point numbers, known as double s, with an integer range from -9,,,,, -2 52 to 9,,,,, 2 52 -- meaning that every integer within this range can be held exactly without a loss of precision.
Each atomic value in Analytica has a data type. There are four data types for numeric values: Floating point real aka double , integer, fixed-point real and complex number. As long as you use integer operations on the integer datatype, you retain bits of integer value from -2 63 to 2 63 - 1. We normally write integers in base 10, or decimal notation, using the digits from 0 to 9. When you select the Integer number format , integers are shown to full precision without resorting to exponential notation, as long as the underlying value is an integer data type.
Non-integer values are shown in exponential format once they have a magnitude of 10 16 or larger. Integers are sometimes written or entered in base 16, known as hexadecimal and colloquially shortened to just hex, in which the digits 0 thru 9 and letters A thru F are used.
When hex notation is used to enter or display an integer value in Analytica, it is always preceded with 0x , as in these examples with the same value in decimal notation shown. The Number Format Dialog does not provide an option for displaying values in hex notation, but you can set this from the Typescript Window by typing:.
When coercing numbers to text, you can use, e. When you type hex values up to 0x7fffffffffffffff , the value is an integer at full precision. Above that, the positive values are greater than 2 63 and are stored as floating point reals with a possible loss in precision. To type a negative value, simply place a minus-sign in front, e. However, when negative numbers are displayed in hex notation, they display in hex using two's complement, where the most significant bit is set, and hence it will have 16 hex digits.
In binary notation, base 2, integers are written using only 0s and 1s. In Analytica, numbers in binary notation are always preceded with 0b , as in these examples. Numbers entered in binary notation having 64 bits with the first bit 1 are interpreted as negative numbers. It is usually much simpler, however, to type a minus sign in front.
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