1 #include <iostream> 2 using namespace std; 3 #define exchange(a,b,x) x=a;a=b;b=x 4 int main() 5 { 6 int m,n,t; 7 cin>>m>>n; 8 exchange(m,n,t); 9 cout<<m<<" "<<n<<endl; 10 return 0; 11 }
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原文：http://www.cnblogs.com/wangmengmeng/p/4547612.html
