Extract the mantissa and exponent.

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <math.h>

double frexp(double value, int *exp);

float frexpf(float, int *);

long double frexpl(long double, int *);

Parameters for this function are:

x	double, float or long double	The value to compute
exp	int	Exponent

The frexp() function extracts the mantissa and exponent of value based on the formula x*2n, where the mantissa is 0.5 £ |x| < 1.0 and n is an integer exponent.

frexp() returns the double mantissa of value. It stores the integer exponent value at the address referenced by exp.

"ldexp"

"fmod"

#include <math.h>
#include <stdio.h>

int main(void)
{
	double m, value = 12.0;
	int e;

	m = frexp(value, &e);

	printf("%f = %f * 2 to the power of %d.\n",value, m, e);

	return 0;
}
Output:
12.000000 = 0.750000 * 2 to the power of 4.





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Last updated: August 16, 2000