【例4.1】 交换两个数的位置
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说明
现有两个整型变量和，分别存放了整数和，编程实现交换两个变量里的数，并输出结果。
输入格式
无
输出格式
如题
样例
无a=22
b=20
You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.
现有两个整型变量和，分别存放了整数和，编程实现交换两个变量里的数，并输出结果。
无
如题
无a=22
b=20