6_58.cpp

几个C++程序设计实例

# include <iostream.h>
# include<iomanip.h>
class stu
{
	int no;
	char name[10];
	class cmarks
	{
        float Eng;int xfEng;
		float Chi;int xfChi;
		float Mat;int xfMat;
	public:
		float aver;
		void setdata()
		{
			float En,Ch,Ma;
			int xfEn,xfCh,xfMa;
			cout<<"English mark:";   cin>>En; 
			setmarksE(En);
			cout<<"English credit:";  cin>>xfEn; 
			setxfE(xfEn);
			cout<<"Chinese mark:"; cin>>Ch; 
			setmarksC(Ch);
			cout<<"Chinese credit:"; cin>>xfCh; 
			setxfC(xfCh);
			cout<<"Maths mark:"; cin>>Ma; 
			setmarksM(Ma);
			cout<<"Maths credit:"; cin>>xfMa; 
			setxfM(xfMa);
		}
		void setmarksE(float E)
		{Eng=E;}
		void setxfE(int xfE)
		{
			xfEng=xfE;
		}
		void setmarksC(float C)
		{
			Chi=C;
		}
		void setxfC(int xfC)
		{
			xfChi=xfC;
		}
		void setmarksM(float M)
		{
			Mat=M;
		}
        void setxfM(int xfM)
		{
			xfMat=xfM;
		}
	    float getEng()
		{
			return Eng;
		}
        float getChi()
		{
			return Chi;
		}
		float getMat()
		{	return Mat;
		}
	    float getave()
		{
			return (Eng*xfEng+Chi*xfChi+Mat*xfMat)/(xfEng+xfChi+xfMat);
		}		
	}marks;
	public:
		void setstd()
		{
		   cout<<"NO:"; cin>>no;
		   cout<<"Name:"; cin>>name;
           marks.setdata();
		}
		void disp1()
		{
			cout<<"NO.  ";
			cout<<"Name  ";
			cout<<"English mark  ";
			cout<<"Chinese mark  ";
			cout<<"maths mark  ";
            cout<<"average mark  ";
			cout<<endl;
		}
		void disp2()
		{
			cout<<setiosflags(ios::left);
			cout<<setiosflags(ios::fixed);  //删除科学标记
            cout<<setprecision(2);  //输出精度设置
			cout<<setw(5)<<no<<"  ";
			cout<<setw(6)<<name<<"  ";
			cout<<setw(12)<<marks.getEng()<<"  ";
			cout<<setw(12)<<marks.getChi()<<"  ";
			cout<<setw(10)<<marks.getMat()<<"  ";
			cout<<setw(10)<<marks.getave();
		}
};
void main()
{
	int n;
	cout<<"请输入学生人数，n=";  //也可直接给定数组大小stu A[2];
	cin>>n;
    stu *ptr=new stu[n]; //动态创建对象数组
	for(int i=0;i<n;i++)
	{
		ptr[i].setstd();
	}
    ptr[0].disp1();
	for(i=0;i<n;i++)
	{
		ptr[i].disp2();
		cout<<endl;
	}
	delete[] ptr; //删除整个对象数组
}