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FREXP(3) Library Functions Manual FREXP(3)

frexp, frexpf, frexpl
convert floating-point number to fractional and integral components

#include <math.h>

frexp(double value, int *exp);

frexpf(float value, int *exp);

long double
frexpl(long double value, int *exp);

The frexp() function breaks a floating-point number into a normalized fraction and an integral power of 2. It stores the integer in the int object pointed to by exp. The frexpf() function is a single precision version of frexp(). The frexpl() function is an extended precision version of frexp().

The frexp(), frexpf() and frexpl() functions return the value x, such that x is a double with magnitude in the interval [1/2, 1) or zero, and value equals x times 2 raised to the power *exp. If value is zero, both parts of the result are zero.

ldexp(3), modf(3)

The frexp() function conforms to ANSI X3.159-1989 (“ANSI C89”).
June 5, 2013 OpenBSD-current