ldexp

Computes a real number from the mantissa and exponent.

doubleldexp(doublex**,intexp);**

For additional compatibility information, see Compatibility in the Introduction.

Libraries

Return Value

The ldexp function returns the value of x***** 2^exp if successful. On overflow (depending on the sign of x), ldexp returns +/– HUGE_VAL; the errno variable is set to ERANGE.

Parameters

x

Floating-point value

exp

Integer exponent

Example

/* LDEXP.C */

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

void main( void )
{
   double x = 4.0, y;
   int p = 3;

   y = ldexp( x, p );
   printf( "%2.1f times two to the power of %d is %2.1f\n", x, p, y );
}

Output

4.0 times two to the power of 3 is 32.0

Floating-Point Support

See Also   frexp, modf