A Simple for Statement - generate the square root of 1 to 10

#include <iostream>
#include <math.h> // for newer compilers, use <cmath>
using namespace std;

int main()
{
  int num;
  double sq_root;

  for(num=1; num < 10; num++) {
    sq_root = sqrt((double) num); //casting num from integer to double 
    				  // then taking its square root
    cout << num << "  " << sq_root << '\n';
  }

  return 0;
}