Question

How to swap values with subtraction and addition in C

Answer 1

#include <stdio.h>

#define SWAP(a, b) ((&(a) == &(b)) || \
                    (((a) -= (b)), ((b) += (a)), ((a) = (b) - (a))))
                    
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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