源程序：
#include <iostream>
using namespace std;
void SwapValue(int a, int b)
{
int tmp;
tmp = a;
a = b;
b = tmp;
cout << "在SwapValue()函数中：\t\ta=" << a << ",b=" << b << endl;
return;
}
void SwapRef(int &a, int &b)
{
int tmp;
tmp = a;
a = b;
b = tmp;
cout << "在SwapRef()函数中：\t\ta=" << a << ",b=" << b << endl;
return;
}
int main()
{
int a = 10, b = 20;
cout << "数据交换前：\t\ta=" << a << ",b=" << b << endl << endl;
SwapValue(a,b);
cout << "调用SwapValue()后：\t\ta=" << a << ",b=" << b << endl << endl;
a = 10;
b = 20;
SwapRef(a,b);
cout << "调用SwapRef()后：\t\ta=" << a << ",b=" << b << endl;
system("pause");
return 0;
}
运行结果：
