C sqrt() function

C sqrt() function - Calculate Square Root

Syntax:

double sqrt(double x)

The sqrt() function is used to calculate the nonnegative value of the square root of x.

Parameters:

Return value from sqrt()

• Returns the square root result.
• Returns 0 if x is negative.

Example: sqrt() function

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

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

int main( void )
{
   double val = 66.34, result;
   result = sqrt( val );
   if( val < 0 )
      printf( "Error: sqrt returns %f\n", result );
   else
      printf( "The square root of %.2f is %.2f\n", val, result );
      
   val = -100;
   result = sqrt( val );
   if( val < 0 )
      printf( "\nError: sqrt returns %f\n", result );
   else
      printf( "\nThe square root of %.2f is %.2f\n", val, result );
}

Output:

The square root of 66.34 is 8.14

Error: sqrt returns -1.#IND00

C Programming Code Editor:

Previous C Programming: C pow()
Next C Programming: C ceil()