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   sqrt

   Usage
   #include <math.h>
   double sqrt(double x);

   Description
   sqrt  returns  the square root of x. If x is negative  then  a  DOMAIN
   error occurs.

   Example
   #include <stdio.h>
   #include <math.h>
   main()
   {
   double x;
        for(x = 1.0; x < = 20.0; ++x)
             printf("The square root of %.4f is %.4f\n",x,sqrt(x));
   }

   Return Value
   sqrt returns the double result.