sqrt

Calculates the square root.

doublesqrt(doublex**);**

For additional compatibility information, see Compatibility in the Introduction.

Libraries

Return Value

The sqrt function returns the square-root of x. If x is negative, sqrt returns an indefinite (same as a quiet NaN). You can modify error handling with _matherr.

Parameter

x

Nonnegative floating-point value

Example

/* SQRT.C: This program calculates a square root. */

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

void main( void )
{
   double question = 45.35, answer;

   answer = sqrt( question );
   if( question < 0 )
      printf( "Error: sqrt returns %.2f\n, answer" );
   else
      printf( "The square root of %.2f is %.2f\n", question, answer );
}

Output

The square root of 45.35 is 6.73

Floating-Point Support Routines

See Also   exp, log, pow