C实例 不使用第三个变量交换

#include <stdio.h>



int main() {

   int a, b;



   a = 11;

   b = 99;



   printf("Values before swapping - \n a = %d, b = %d \n\n", a, b);



   a = a + b;  // ( 11 + 99 = 110)

   b = a - b;  // ( 110 - 99 = 11)

   a = a - b;  // ( 110 - 11 = 99)



   printf("Values after swapping - \n a = %d, b = %d \n", a, b);

}