C++ Program to Swap Two Numbers without using Third Variable1 min read

In this tutorial, we will write a program to swap numbers without using a temporary variable in C++. . There are two ways to swap variables.

  1. Using + and
  2. Using * and /

Let us go through each of them with a C program. You may check out the following program.

Both of the programs take the user input for two integers and swap those two values in two separate ways without using a temporary variable.


C++ Program to Swap Two Numbers without using Third Variable

1. Using + and –

Output:

Enter the first number: 10
Enter the second number: 20

Result after Swapping Two Numbers:
num1: 20
num2: 10


2. Using * and /

Output:

Enter the first number: 5
Enter the second number: 10

Result after Swapping Two Numbers:
num1: 10
num2: 5

Note that the swapping using / and * will not work if one of the swapping values is zero (0).

You may go through the following program in C++:


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