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C LIBRARY FUNCTIONS->Detailed Descriptions->frexp() frexpl()

Summary

#include <math.h>
    

double frexp(double x, int *exp)	Break into fraction and exponent
long double frexpl(long double x, int *exp)	Break into fraction and exponent to long double precision

Parameter
    

x	Floating point value
exp	Pointer to integer to receive the exponent

Description

These functions break the floating point value of x into a mantissa (m) and an exponent (e) such that the mantissa is in the range 0.5 to 1.0 and x equals 2 to the power e times m.

Return

These functions return the mantissa.  If x is zero, then both parts of the result (mantissa and exponent) are zero.  There is no error return.