- NAME
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frexp - convert floating-point number to fractional and integral components.
- SYNOPSIS
#include <math.h>
double frexp(double x, int *exp);- DESCRIPTION
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The function frexp() is used to decompose num into two parts: a mantissa between 0.5 and 1 (returned by the function) and an exponent returned as exp. Scientific notation works like this:
num = mantissa * (2 ^ exp)
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Warning
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You’ll also need to link the program against the math library (see example below) using the -lm compile/link option.
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- RETURN VALUE
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The frexp() function returns the normalized fraction. If the argument x is not zero, the normalized fraction is x times a power of two, and is always in the range 1/2 (inclusive) to 1 (exclusive). If x is zero, then the normalized fraction is zero and zero is stored in exp.
- SEE ALSO
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ldexp, modf
- EXAMPLE
link:src/frexp.c[role=include]- OUTPUT
$ gcc -Wall -lm frexp.c $ ./a.out 0.950000 * 2^4 = 15.200000