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源码:
int n1=10, n2=20;
n1 = n1 - n2; // -10 n2 = n1 + n2; // 10 n1 = n2 - n1; // 20
C#之不借助第三变量交换两变量值
原文地址:http://www.cnblogs.com/cai1432452416/p/4672286.html