frexp(3) Library Functions Manual frexp(3)
Name
frexp, ldexp, modf - split into mantissa and exponent
Syntax
#include <math.h>
double frexp(value, eptr)
double value;
int *eptr;
double ldexp(value, exp)
double value;
double modf(value, iptr)
double value, *iptr;
Description
The subroutine returns the mantissa of a double value as a double quantity, x, of magnitude less than 1.0 and greater than or equal to 0.5
(0.5 <= |x| < 1) and stores an integer n such that value = x*2**n indirectly through eptr.
The returns the quantity value*2**exp.
The returns the positive fractional part of value and stores the integer part indirectly through iptr.
Return Values
If would cause overflow, +-HUGE_VAL is returned (according to the sign of value) and errno is set to ERANGE. If would cause underflow, 0
is returned and errno is set to ERANGE.
frexp(3)
