frexp

Name

frexp, frexpf, frexpl
- convert floating-point number to fractional and integral components

Library

libm.lib

Synopsis

#include <math.h>

double frexp (double value, int *exp);

float frexpf (float value, int *exp);

long double frexpl (long double value, int *exp);

Return values

These functions return the value x, such that x is a double with magnitude in the interval [1/2, 1) or zero, and value equals x times 2 raised to the power *exp. If value is zero, both parts of the result are zero.

Detailed description

The frexp, frexpf, and frexpl functions break a floating-point number into a normalized fraction and an integral power of 2. They store the integer in the int object pointed to by exp. As there is no long double is not supported by SYMBIAN, frexpl (is, aliased, to, the);
frexp

Examples

void main( void )
{
   double x1 = 4.0 , y;
   int res;
   y = frexp( x1, &res );
   printf( "frexp(%f , &res):: Int Part: %d and Fractional Part: %f \n", x1, res, y );
   y = frexpf( x1, &res );
   printf( "frexpf(%f , &res):: Int Part: %d and Fractional Part: %f \n", x1, res, y );
   y = frexpl( x1, &res );
   printf( "frexpl(%f , &res):: Int Part: %d and Fractional Part: %f \n", x1, res, y );
}

Output

frexp ( 4.0 , &res ) :: Int Part: 3 and Fractional Part: 0.5
frexpf( 4.0,  &res ) :: Int Part: 3 and Fractional Part: 0.5
frexpl( 4.0,  &res ) :: Int Part: 3 and Fractional Part: 0.5

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