// This program reads a number x from the standard input
// and writes the square root of x.
#include <cstdio>
#include <cmath>
using namespace std;
int main()
{
double x;
printf("Square root of what number? ");
scanf("%lf", &x);
printf("The square root of %lf is %lf\n", x, sqrt(x));
return 0;
}