C语言交换两个int变量值（不使用第三个变量）

#include <stdio.h>

void swap(int *a, int *b) {
    *a = *a + *b;
    *b = *a - *b;
    *a = *a - *b;
}

int main() {
    int a = 3, b = 5;
    printf('Before swap: a = %d, b = %d\n', a, b);
    swap(&a, &b);
    printf('After swap: a = %d, b = %d\n', a, b);

    return 0;
}