#include <iostream>
#include <string>
using namespace std;


int main()

{

        int a = 5;
	int b = 10;

	// use this:
	cout << static_cast<double>(a) / b << endl;   // p.24

	// older styles: do not use!
	cout << (double)a   << endl;
	cout << double(a)  << endl; 



	return 0;

}