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

int main(int argc, char *argv[]) { 
   int i;
   double x;


   for (i = 2;  i < 10;  ++i) {
      x = sqrt((double) i);
      printf("%d^2 = %2d, sqrt(%d) = %20.16f\n", i, i * i, i, x);
   }


   return 0; 
}