Summary: In this tutorial, we will learn different ways to swap two numbers without using the third variable in the C programming language.

Method 1: Using + and – Operator

Output:

Before Swap:
a: 5
b: 6
After Swap:
a: 6
b: 5


In this method, we have used plus (+) and minus (-) operator to swap the values of a and b without declaring the third variable.

We add both numbers and assign a new value for each variable by subtracting the value of the other correspondent from the sum.

Method 2: Using * and / Operator

Output:

Before Swap:
a: 4
b: 3
After Swap:
a: 3
b: 4


This method applies the same approach as the previous method to swap two numbers but is implemented using the multiplication (*) and division (/) operator.

We multiply both the numbers and assign a new value for each variable by dividing the value of the other correspondent from the product.

Method 3: Using XOR (^) Operator

Output:

Before Swap:
a: 12
b: 9
After Swap:
a: 9
b: 12


In this method, we store XOR’s hybrid value (i.e. a^b) in a and then we extract another correspondent value using the same expression,

i.e. Second Variable = (XOR Hybrid of Both) ^ (First Variable).

These were some of the ways we can swap two numbers without using any temporary variables in programming.

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