Usage and Example of C Library Function sqrt()

C Standard Library - <math.h>

C Library Function double sqrt(double x) Returns x square root.

Declaration

Below is the declaration of the sqrt() function.

double sqrt(double x)

Parameter

• x 　-- Floating-point value.

Return Value

This function returns the square root of x.

Online Example

This example demonstrates the usage of the sqrt() function.

#include <stdio.h>
#include <math.h>
int main()
{
　　　　printf("%lf's square root is %lf\n",　54.0, sqrt(54.0));
　　　　printf("%lf's square root is %lf\n",　38.0, sqrt(38.0));
　　　　printf("%lf's square root is %lf\n",　8.0, sqrt(8.0));
　　　　return(0);
}

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

54The square root of .000000 is　7.348469
38The square root of .000000 is　6.164414
8The square root of .000000 is　2.828427

C Standard Library - <math.h>