Question

How to use bitwise XOR operation with macro to swap two numbers in C

Answer 1

#include <stdio.h>
  
#define SWAP(x, y) ((&(x) == &(y)) ? (x) : ((x)^=(y), (y)^=(x), (x)^=(y)))
  
int main() {
    long x = 3;
    long y = 7;

    SWAP(x, y);
     
    printf("x = %ld, y = %ld\n", x, y);
  
    return 0;
}
 
  
  
/*
run:
  
x = 7, y = 3
  
*/

 

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Answer 2

#include <stdio.h>

#define SWAP(a, b) (((a) ^= (b)), ((b) ^= (a)), ((a) ^= (b)))
                    
int main(void) {
    int x = 8290, y = 1000;              

    SWAP(x, y);
  
    printf("x = %d y = %d\n", x, y);
      
    return 0;
}
  
  
  
  
/*
run:

x = 1000 y = 8290

*/

 

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