frexp() - math.h

The C library function double frexp(double x, int *exponent) return value is the mantissa, and the integer pointed to by exponent is the exponent. The resultant value is x = mantissa * 2 ^ exponent.

Syntax

double frexp(double x, int *exponent)

Example

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

int main ()
{
   double x = 1024, fraction;
   int e;
   
   fraction = frexp(x, &e);
   printf("x = %.2lf = %.2lf * 2^%d\n", x, fraction, e);
   
   return(0);
}

Output / Return Value

x = 1024.00 = 0.50 * 2^11

Limitations

Alternatives / See Also

Reference