Answer to Question #152430 in C++ for Usama Saleem

Question

Write a program which takes two integers as input and displays the result of subtracting the second number from the first. You are not allowed to use the "-" operator. You can only use a for loop and the increment and decrement operators.

Answer 1

#include<stdio.h>
#include <iostream>
using namespace std;

int subtract(int x, int y)
{
    if (y == 0)
        return x;
    return subtract(x ^ y, (~x & y) << 1);
}

int main()
{
    int x, y;
    cout << "Enter two integers:";
    cin>>x>>y;
    printf("x - y is %d", subtract(x, y));
    return 0;
}