交换变量方法

1.通过中间临时变量来交换：

void change1()
{
int a = 100;
int b = 200;
printf("a=%d,b=%d\n", a, b);
int temp = 0;
temp = a;
a = b;
b = temp;
printf("a=%d,b=%d", a, b);
getchar();
}

2.不利用中间临时变量：

void change2()
{
int a = 100;
int b = 200;
printf("a=%d,b=%dAAA\n", a, b);
a = a + b;
b = a - b;
a = a - b;
printf("a=%d,b=%dAAA\n", a, b);
getchar();
}

void change3()
{
int a = 100;
int b = 200;
printf("a=%d,b=%dAAA\n", a, b);
a = a * b;
b = a / b;
a = a / b;
printf("a=%d,b=%dAAA\n", a, b);
getchar();
}