C Reference function frexp()

Usage of frexp():

double frexp(double x, int *exponent);

Parameters:

The floating-point number x is broken up into a mantissa and exponent.The returned value is the mantissa and the integer pointed to by exponent is the exponent. The resultant value is x=mantissa * 2^exponent.

Return value:

The mantissa is in the range of .5 (inclusive) to 1 (exclusive)

Source code example of frexp():

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

	main()
	{
		double input, output;
		int i;

		input = 10.0;
		output = frexp (input , &i);
		printf ("%lf * 2^%d = %f\n", output, i, input);
		return 0;
	}

Output of the frexp example program above:

	0.625000 * 2^4 = 10.000000