C Program to Swap two integers value without using third variable

C Program to Swap Two Integers Without Using Third Variable (Arithmetic Operators)

This c program is used to swap two integers value using arithmetic logic and without using the third variable

#include<stdio.h>                                                               
                                                                               
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);                               
   a = a + b;                                                                   
   b = a - b;                                                                   
   a = a - b;                                                                   
   printf("After Swap: b = %d, b = %d\n", a, b);                                
}                                                                                        
Output:
$ cc swap1.c 
$ ./a.out 
Enter a: 23
Enter b: 43
Before swap: a = 23, b = 43
After Swap: b = 43, b = 23

C Program To Swap Two Integers Without Using Third Variable (Bitwise XOR Logic)

This c program is used to swap two integers value using bitwise XOR logic and without using the third variable

#include<stdio.h>                                                               
                                                                                                                                                                                                                       
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);                               
   a = a ^ b;                                                                   
   b = a ^ b;                                                                   
   a = a ^ b;                                                                   
   printf("After Swap: b = %d, b = %d\n", a, b);                                
}                                                                                                                                                                     
Output:
$ cc swap2.c 
$ ./a.out 
Enter a: 45
Enter b: 53
Before swap: a = 45, b = 53
After Swap: b = 53, b = 45

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