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Manual Pages  — FREXP


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



Math Library (libm, -lm)


#include <math.h>

frexp(double value, int *exp);

frexpf(float value, int *exp);

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


The frexp(), frexpf() and frexpl() functions break a floating-point number into a normalized fraction and an integral power of 2. They store the integer in the int object pointed to by exp.


These 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), math(3), modf(3)


The frexp(), frexpf(), and frexpl() functions conform to ISO/IEC 9899:1999 ("ISO C99").

FREXP (3) March 4, 2005

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