9-5.cpp

为初学者提供的最佳的C++程序设计源程序库

#include<iostream.h>
#include<iomanip.h>
#include<string.h>
class student
{
  char name[10];
  int deg1,deg2,deg3;
public:
	student(){deg1=deg2=deg3=0;}
	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();
  s4.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
}