C program swap two number using third variable

In this tutorial, we are going to learn new program which is Swapping of two numbers and most commonly used in exams or in interviews.

Implementation of this program is very simple.

What is swapping: Swapping of two numbers means replacing the numbers.

How to swap two numbers using the third variable?

For swapping number first we have 2 numbers and using the third variable we swap numbers by doing following steps

Steps for swapping using the third variable

Take two variable with numbers stores in it and one-third variable  (a temporary variable )

Variable a, b, temp

1. Copy first variable value in a temporary variable.

temp  = a

2. Copy the second variable value in the first variable.

a = b

3. Copy temporary variable value to the first variable.

b = temp

Example

First number = 10

Second number = 20

Temp number

Now swap numbers using above steps

Temp number = First number

=> Temp number = 10

First number = second number

=> First number = 20

Second number = Temp number

=> second number = 10

We got the swapped number as,

First number = 20

Second number = 10

In this way, we implement swapping of two numbers using the third variable

C program swap two number using the third variable

Output :

Explanation

1. First Here we initialized first, second and temp variable

first –> for storing 1st number

second –>for storing the second number

temp  ->for storing temporary variable

2. Now here goes the logic(let us take first=10 and second=20)

temp = first  ,  Therefore, temp =10

first = second , Therefore first = 20

second = temp, Therefore  second =10

3. Now the values of first and second are 20 and 10

4. The values of first and second after swapping are printed.

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