C++ Exercises: Swap the values of two variables not using third variable

C++ Basic: Exercise-48 with Solution

Write a C++ program that swaps two variables without using a third variable.

Pictorial Presentation:

Sample Solution:

C++ Code :

#include <iostream>
using namespace std;
 
int main()
{
	cout << "\n\n Swap two numbers without using third variable:\n";
	cout << "---------------------------------------------------\n";
	int num1, num2, temp;
	cout << " Input 1st number : ";
	cin >> num1 ;
	cout << " Input 2nd number : ";
	cin >> num2;	
	num2=num2+num1;
	num1=num2-num1;
	num2=num2-num1;
    cout << " After swapping the 1st number is : "<< num1 <<"\n" ; 
    cout << " After swapping the 2nd number is : "<< num2 <<"\n\n" ; 	
}

Sample Output:

Swap two numbers without using third variable:                        
---------------------------------------------------                    
 Input 1st number : 25                                                 
 Input 2nd number : 20                                                 
 After swapping the 1st number is : 20                                 
 After swapping the 2nd number is : 25

Flowchart:

C++ Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a program in C++ to calculate the sum of all even and odd numbers in an array.
Next: Write a program in C++ to print the code (ASCII code / Unicode code etc.) of a given character.