n.再交换；退汇
This paper is mainly discussed the problem of data reexchange when we exchange data using pointer variables in an example of C programming. 摘要文章主要讨论了在C语言教学中的一个数据交换实例中利用指针变量进行数据交换，而出现的数据重复置换的问题；
The client uses cash remit money, not obligate has address and connection telephone call, because remit hind is other reason by reexchange, how should handle? 客户用现金汇款，未预留有地址和联系电话，汇出后由于其他原因被退汇，应该怎样处理？
data reexchange 数据重复置换
