Question

How to create a macro that swap two values in C

Answer 1

#include <stdio.h>

#define SWAP(x, y) (x ^= y ^= x ^= y)

int main() {

    int a = 3, b = 7;

    SWAP(a, b);

    printf("a = %d b = %d", a, b);

    return 0;
}



/*
run:

a = 7 b = 3

*/

 

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