C++ Program To Swap Two Numbers ( 3 Best Ways )

In this tutorial, we are going to write a C++ program to swap two numbers. This is the most asked question of any programming languages, So in this article, we will see different-different ways to swap two numbers using C++.

If you are beginner in C++, Then this tutorial will very helpful for you.

In previous tutorial, we have seen how to add two numbers using C++.

In this guide we will see different techniques to write a c++ program to swap two numbers, Here we will swap two numbers using the third variable as well as without using the third variable

Headings of Contents

1 C++ Program To Swap Two Numbers
2 Conclusion:

C++ Program To Swap Two Numbers

C++ provides various options to write C++ Program To Swap Two Numbers. Here we will write a different C++ program to swap two numbers. This swapping program is mostly asked by the interviewer in C++ coding round interviews.

Example 1:

In this example we will write C++ program to swap two numbers.

// Online C++ compiler to run C++ program online
#include <iostream>
using namespace std;

int main()
{

int first, second, temp;

// get first number from user
cout<<"Enter First Number:- ";
cin>>first;

//get second number from user
cout<<"Enter Second Number:- ";
cin>>second;

//Display both number before swapping
cout<<"\n\nBefore swapping";
cout<<"\nFirst Number is:- "<<first;
cout<<"\nSecond Number is:- "<<second;


// Swapping logic
temp = first;
first  = second;
second = temp;

//Display both number after swapping
cout<<"\n\nAfter swapping";
cout<<"\nFirst Number is:- "<<first;
cout<<"\nSecond Number is:- "<<second;

return 0;

}

Output

Enter First Number:- 56
Enter Second Number:- 78


Before swapping
First Number is:- 56
Second Number is:- 78

After swapping
First Number is:- 78
Second Number is:- 56

Explain Code:

We have explained our code according to the above example.

First, we create three variables first, second, and temp.
Asked two values from the user and store them inside the first and second variables.
Print both first and second variables value on the screen.
Then, we assigned the first variable value inside the temp variable using temp = first code. temp value becomes 56.
Then, we store the second variable value inside the first variable using the first = second code. first become 78.
Again, we stored the temp variable value inside the second variable using second = temp code. second become 56.
Print both variables first and second value after swapping.

Example 2:

In this example, we will write a C++ program to swap two numbers without third variable.

#include <iostream>
using namespace std;

int main()
{

int first, second;

// get first number from user
cout<<"Enter First Number:- ";
cin>>first;

//get second number from user
cout<<"Enter Second Number:- ";
cin>>second;

//Display both number before swapping
cout<<"\n\nBefore swapping";
cout<<"\nFirst Number is:- "<<first;
cout<<"\nSecond Number is:- "<<second;

//Display both number after swapping
// Swapping logic
first = first * second;
second  = first/second;
first = first/second;


cout<<"\n\nAfter swapping";
cout<<"\nFirst Number is:- "<<first;
cout<<"\nSecond Number is:- "<<second;

return 0;

}

Output

Enter First Number:- 10
Enter Second Number:- 15


Before swapping
First Number is:- 10
Second Number is:- 15

After swapping
First Number is:- 15
Second Number is:- 10

Explain Code

First, we create three variables first, second, and temp.
Asked two values from the user and store them inside the first and second variables.
Print both first and second variables value on the screen.
We multiply both first and second variable value and assigned into the first variable using first = first * second; code.
Now, we divide first by second variable and store quotient into second using second = first/second; code.
Then, Again we divide first by second and store quotient into the first variable using first = first/second; code.
Print both variables first and second value after swapping.

Example 3:

Here we will write C++ program to swap two numbers without third variable.

#include <iostream>
using namespace std;

int main()
{

int first, second;

// get first number from user
cout<<"Enter First Number:- ";
cin>>first;

//get second number from user
cout<<"Enter Second Number:- ";
cin>>second;

//Display both number before swapping
cout<<"\n\nBefore swapping";
cout<<"\nFirst Number is:- "<<first;
cout<<"\nSecond Number is:- "<<second;

//Display both number after swapping
// Swapping logic
first = first + second;
second  = first - second;
first = first - second;


cout<<"\n\nAfter swapping";
cout<<"\nFirst Number is:- "<<first;
cout<<"\nSecond Number is:- "<<second;

return 0;

}

Output

Enter First Number:- 12
Enter Second Number:- 22


Before swapping
First Number is:- 12
Second Number is:- 22

After swapping
First Number is:- 22
Second Number is:- 12

Conclusion:

In this tutorial, you have learned how to write C++ program to swap two numbers. If you are a beginner in C++ programming, Then this C++ program to swap two numbers example most important for you because this question mostly asked by any interviewer.

I hope this tutorial will help you. If you like this article, please comment and share it with your friends who want to learn C++ programming and write this type of C++ example.