C Program to Swap two integers using call by reference

C Program to Swap Two Integers Using Call By Reference Function

This c program defines a call by reference swap function which is used to swap two integer variables value.

Swapping variable data type can be float, character as well. this example is based on integer variables.

C Program Call by Reference Example:

#include<stdio.h>                                                               
                                                                                                                                        
// Swap function declaration                                                    
void swap(int*, int*);                                                          
                                                                                
void main()                                                                     
{                                                                               
   int a, b;                                                                    
                                                                                
   printf("Enter a: ");                                                         
   scanf("%d", &a);                                                             
   printf("Enter b: ");                                                         
   scanf("%d", &b);                                                             
                                                                                
   printf("Before swap: a = %d, b = %d\n", a, b);                               
   swap(&a, &b);                                                                
   printf("After Swap: b = %d, b = %d\n", a, b);                                
}                                                                               
//Swap function definition                                                      
void swap(int *a, int *b)                                                       
{                                                                               
   int temp;                                                                    
   temp  = *b;                                                                  
   *b = *a;                                                                     
   *a = temp;                                                                   
}                                                                                      

$ cc swap.c
$ ./a.out 
Enter a: 34
Enter b: 54
Before swap: a = 34, b = 54
After Swap: b = 54, b = 34