NAME

frexp, ldexp, modf − split into mantissa and exponent

SYNOPSIS

double frexp(value, eptr)
double value;
int ∗eptr;

double ldexp(value, exp)
double value;

double modf(value, iptr)
double value, ∗iptr;

DESCRIPTION

frexp returns a mantissa x and (indirectly through eptr) an exponent n such that x multiplied by 2 raised to n is equal to value:

value = x∗2n

ldexp returns the quantity value∗2exp. 

modf returns the positive fractional part of value and stores the integer part indirectly through iptr. 

7th Edition  —  May 15, 1985