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#include<iostream>
using namespace std;
void swap(int &a, int &b);
int main()
{
int num1 = 10;
int num2 = 20;
cout<<num1<<" "<<num2<<endl;
swap(num1, num2);
cout<<num1<<" "<<num2<<endl;
return 0;
}
void swap(int &a, int &b)
{
int temp = a;
a = b;
b = temp;
}
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原文地址：http://www.cnblogs.com/flywolf601/p/5874100.html
