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当然是再找来一个临时杯子：
2）再把 b b b 杯子的水倒进 a a a 杯子里；
3）最后把临时杯子里的水倒进 b b b 杯子；
这种就是临时变量法，那么当然，还有很多很多的方法，接下来就让我们来见识一下吧。
1、正确解法1：引入临时变量
#include
int main() { int a, b, tmp; while (scanf( %d %d , &a, &b) != EOF) { tmp = a; // (1) a = b; // (2) b = tmp; // (3) printf( %d %d\n , a, b); } return 0;
} ( 1 ) (1) (1) ( 2 ) (2) (2) ( 3 ) (3) (3)
这三步，就实现了变量 a a a 和 b b b 的交换。
2、正确解法2：引入算术运算
#include
int main() { int a, b; while (scan ....
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