C library function - ldexp()

Description

The C library function double ldexp(double x, int exponent) returns x multiplied by 2 raised to the power of exponent.

Declaration

Following is the declaration for ldexp() function.

double ldexp(double x, int exponent)

Parameters

• x − This is the floating point value representing the significand.

• exponent − This is the value of the exponent.

Return Value

This function returns x * 2 ^exp

Example

The following example shows the usage of ldexp() function.

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

int main () {
   double x, ret;
   int n;

   x = 0.65;
   n = 3;
   ret = ldexp(x ,n);
   printf("%f * 2^%d = %f\n", x, n, ret);
   
   return(0);
}

Let us compile and run the above program that will produce the following result −

0.650000 * 2^3 = 5.200000