Exercise 2.17

//Exercise 2.17
//This program displays "1 2 3 4" in three different ways
#include <iostream>
using namespace std;

int main(){
    cout << "1 2 3 4" << endl;
    cout << "1 " << "2 " << "3 " << "4" << endl;
    cout << "1 ";
    cout << "2 ";
    cout << "3 ";
    cout << "4" << endl;
}