C++ Program to Swap Two Numbers

Code 1: Swap Numbers (Using Temporary Variable)

#include <iostream>
using namespace std;
int main()
{
    int a = 5, b = 10, temp;
    cout << "Before swapping." << endl;
    cout << "a = " << a << ", b = " << b << endl;
    temp = a;
    a = b;
    b = temp;
    cout << "\nAfter swapping." << endl;
    cout << "a = " << a << ", b = " << b << endl;
    return 0;
}

Output

Before swapping.
a = 5, b = 10
After swapping.
a = 10, b = 5

Code 2: Swap Numbers Without Using Temporary Variables

#include <iostream>
using namespace std;
int main()
{
   
    int a = 5, b = 10;
    cout << "Before swapping." << endl;
    cout << "a = " << a << ", b = " << b << endl;
    a = a + b;
    b = a - b;
    a = a - b;
    cout << "\nAfter swapping." << endl;
    cout << "a = " << a << ", b = " << b << endl;
    return 0;
}