#include<iostream>
using namespace std;
class Student
{
public:
Student(int n,float s):num(n),score(s){}
void change(int n,float s){num = n;score = s;}
void display(){cout<<num<<" "<<score<<endl;}
private:
int num;
float score;
} ;
void fun(Student &t)
{t.display();
t.change(101,80.5);
t.display();
}
int main()
{Student t1(101,78.5);
fun(t1);
return 0;
}
一个C++程序
原文：http://blog.51cto.com/13615683/2106604
