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==Calculate square root: how to use sqrt==


   
<source lang="cpp">

#include <stdio.h>
#include <math.h>
int main ()
{
  double param, result;
  param = 1024.0;
  result = sqrt (param);
  printf ("sqrt(%lf) = %lf\n", param, result );
  return 0;
}

           
       </source>


==Get the square root==


   
<source lang="cpp">
#include <stdio.h>
#include <math.h> /* needed by sqrt() */
int main(void)
{
  double answer;
  answer = sqrt(20.0);
  printf("%f", answer);
  return 0;
}
 
           
       </source>