Question 1

#include"stdafx.h"
#include "string"
#include <iostream>
/*
using function by refrence multiple two numbers (a,b) and print the resualt in main
*/
using namespace std;
void mult(int &a, int &b) {
    a*=2;
    b*=2;
}
int main()
{
    int a, b;
    cout << "a : ";
    cin >> a;
    cout << "b : ";
    cin >> b;
    mult(a, b);
    cout<<b<<endl<<a<<endl;
    return 0;
}