Usage and Example of C Library Function ldexp()

C Standard Library - <math.h>

C Library Function double ldexp(double x, int exponent) returns x multiplied by 2 of exponent power

Declaration

Below is the declaration of the ldexp() function.

double ldexp(double x, int exponent)

parameter

• x 　-- represents the floating-point value of the significant digits.

• exponent 　-- to the power of the exponent.

Return Value

This function returns the value of x * 2 ^exp.

Online Example

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

#include <stdio.h>
#include <math.h>
int main ()
{
　　　double x, ret;
　　　int n;
　　　x =　1.65;
　　　n =　5;
　　　ret = ldexp(x, n);
　　　printf("%f　*　2^%d = %f\n", x, n, ret);
　　　
　　　return(0);
}

Let's compile and run the above program, which will produce the following result:

1.650000　*　2^5　=　52.800000

C Standard Library - <math.h>