e8.cpp

这是一些c＋＋的代码和测试题

#include<iostream.h> 
#include<iomanip.h> 
#include<string.h> 
class student 
{ 
  char name[10]; 
  int deg1,deg2,deg3; 
public: 
  student(){} 
  student(char na[],int d1,int d2,int d3) 
  { 
   strcpy(name,na); 
   deg1=d1;deg2=d2;deg3=d3; 
  } 
  friend student operator+(student s1,student s2) 
  { 
   static student st; 
   st.deg1=s1.deg1+s2.deg1; 
   st.deg2=s1.deg2+s2.deg2; 
   st.deg3=s1.deg3+s2.deg3; 
   return st; 
  } 
  void disp() 
  { 
   cout<<setw(10)<<name<<setw(5)<<deg1<<setw(5)<<deg2<<setw(5)<<deg3<<endl; 
  } 
  friend void avg(student &s,int n) 
  { 
   cout<<setw(10)<<"平均分"<<setw(5)<<s.deg1/n<<setw(5)<<s.deg2/n<< setw(5)<<s.deg3/n <<endl; 
  } 
}; 
void main() 
{ 
student s1("Li",78,82,86),s2("Zheng",75,62,89); 
student s3("Ma",89,87,95),s4("Xu",54,78,66),s; 
cout<<"输出结果"<<endl; 
s1.disp(); 
s2.disp(); 
s3.disp(); 
s4.disp(); 
s=s1+s2+s3+s4; // 调用重载运算符 
avg(s,4); // 友元函数求平均分 
}