How to swap two numbers in C Language ?

Introduction: How to swap/Interchange the value of two numbers/values in C Language is very basic task. There are a number of ways to swap the value of two numbers in C Language.  In this article I am going to use a temporary variable or we can say third variable to help in swapping. In the article How to swap two numbers without using temporary variable in C Language?  I have explained how to swap two numbers without using temporary variable and there is also my another article Another way to swap two numbers without using temporary variable in C Language?  that explains another way to swap two numbers in C Language.

Program example: Let's understand by an program

#include<stdio.h>

#include<conio.h>

void main()

{

 int a,b,temp;

  clrscr();

 printf("Enter the value of a= ");

 scanf("%d",&a);

 printf("\nEnter the value of b= ");

 scanf("%d",&b);

 printf("\nValue of a before swapping= %d",a);

 printf("\nValue of b before swapping= %d",b);

 temp=a;

 a=b;

 b=temp;

 printf("\nValue of a after swapping= %d",a);

 printf("\nValue of b after swapping= %d",b);

 getch();

 }

Run the program using ctrl+F9

Output:

Enter the value of a=10

Enter the value of b=20

Value of a before swapping=10

Value of b before swapping=20

Value of a after swapping=20

Value of b after swapping=10

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