c++课设.cpp

我大一时候做的成绩管理系统 不是很成熟 希望大家指正

#include<iostream>
#include<string>
#include<fstream>
using namespace std;
class stu//////类的定义
{
  public:
	stu()
	 {  strcpy(name,"");strcpy(number,"");
        math=chinese=english=average=sum=0;
	 }
     stu(char n[200],char num[200],double ma,double chin,double eng)
	 {
        strcpy(name,n);
        for(int i=0;i<200;++i)
            number[i]=num[i];
        math=ma;
        chinese=chin;
        english=eng;
	 }
     double getsum()
	 {
        sum=chinese+english+math;
        return sum;
	 }
     double getaver()
	 {
        average=getsum()/3;
        return average;
	 }
     friend void main();
	
   private:
    char name[200],number[200];
    double math,chinese,english,average,sum;

};

void main()                                                    
{
  cout<<"                                                                           "<<endl;
  cout<<"                              ㊣━━^-^o中華人民共和國o^-^━━㊣           "<<endl;  
  cout<<"                              ┃　　　　华东交通大学　 　　　 ┃           "<<endl;
  cout<<"                              ┃ 　 软件学院软件工程八班      ┃ 　        "<<endl;
  cout<<"                              ㊣━━^-^学生成绩查询系统^-^━━㊣	        "<<endl;
  cout<<"                      ★★★★                                   ★★★★  "<<endl;                           
  cout<<"                             (0)数据录入               (1)文件读取         "<<endl;
  cout<<"                             (2)删除人员               (3)修改数据         "<<endl;
  cout<<"                             (4)总成绩查询             (5)姓名查询         "<<endl;
  cout<<"                             (6)输出学生数据           (7)总分排名         "<<endl;                  
  cout<<"                             (8)语文排名               (9)数学排名         "<<endl;   
  cout<<"                             (10)英语排名              (11)如有删除请保存  "<<endl;
  cout<<"                                                                           "<<endl;
  cout<<"                                 ★★★★请输入相应的代码★★★★          "<<endl;                            
  cout<<"                      * * * * * * * * * * * * * * * * * * * * * * * * * *  "<<endl;                                                                       
  int p;char w;
  stu *s[200]={0};
  int i=0,j=0;bool flag2=0; char c='y',nam[200],num[200];double mat,chin,eng;

  cout<<"  ▉▉▉▉▉▉▉▉▉▉▉▉▉ 99% ............."<<endl;
  cout<<"                                      "<<endl;
  cout<<"  LOADING SYSTEM:..................   "<<endl;
  cout<<"                                    "<<endl;
  cout<<"  欢迎你使用本学生成绩查询系统:"<<endl;
  cout<<"    ^-^ 请选择相应操作代码^-^: ";
  do///////////////起始指令判断
  {
    cin>>p;
    if((p>=0&&p<=11))
       flag2=1;
    else
          cout<<"指令错误！请重新输入："<<endl;
  }while(flag2==0);
  /////////////开辟存储空间
   char *infilename="测试数据.dat";
   ifstream  infile(infilename,ios::in);
   if(!infile)
	 cout<<"   指定文件名<"<<infilename<<">不存在,请仔细核对,系统将自动退出操作!"<<endl;
   else 
	  while(infile&&i<200)
	  {infile>>nam>>num>>mat>>chin>>eng;
       s[i]=new stu(nam,num,mat,chin,eng);
       ++i;
	  }
	  i=i-1;
   infile.close();
  ofstream  outfile("测试数据.dat",ios::app);
   do{
	   switch(p)
	   { 
		case 0:///数据录入
			{
		          do{ cout<<"请输入姓名:"<<endl;cin>>nam;
                      cout<<"请输入学号:"<<endl;cin>>num; 
                      cout<<"请输入数学成绩:"<<endl;cin>>mat;
                      cout<<"请输入语文成绩:"<<endl;cin>>chin;
                      cout<<"请输入外语成绩:"<<endl;cin>>eng;
                      outfile<<nam<<"   "<<num<<"  "<<mat<<"   "<<chin<<"  "<<eng<<"  "<<endl;
                           s[i]=new stu(nam,num,mat, chin, eng);
                                  i++;
                      cout<<"数据录入成功，想继续录入吗(y/n)"<<endl;
                             cin>>c;
                             flag2=0;
                          do
						  { if(c!='y'&&c!='n')
						     {cout<<"指令错误！请重新输入!"<<endl;
                              cin>>c;
						     }
                            else
                               flag2=1;
						  }while(flag2==0);
				     }while(c=='y');
                  outfile.close();system("cls");
					break;
				}   

	case 1:///文件读取
			{  string infilena; cout<<"     请输入指定输入文件名:";cin>>infilena;
				 ifstream  infile(infilena.c_str(),ios::in);cout<<endl;
				 if(!infile)
					     cout<<"   指定文件名<"<<infilename<<">不存在,请仔细核对,系统将自动退出操作!"<<endl;
				 else 
				   while(infile&&i<200)
					  {  infile>>nam>>num>>mat>>chin>>eng;
					    s[i]=new stu(nam,num,mat,chin,eng);
					     ++i;
					  }
					 infile.close();
					 break;
			 }	
	case 2:////删除人员
			{char name[20];bool flag3=0;char c;
				 do
				 {cout<<"请输入您要删除的学生姓名："<<endl;
				   cin>>name;
					 for(int h=0;h<i;h++)
					  if(strcmp(name,s[h]->name)==0)
					   {  flag3=1;
					      i--;
					    do
							{s[h]=s[h+1];
						      h++;
						    }while(h<=i);
						  }		 
					 if(flag3==0)
					cout<<"您要求删除的对象本来就不存在！请检查输入的正确性！";
					 cout<<"要继续删除吗？(y/n)"<<endl;
					 cin>>c;
					 if(c!='y'&&c!='n')
					  { cout<<"指令错误！请重新输入！"<<endl;
						   cin>>c;
					 }
				}while(c=='y');system("cls");
				break;
			}
	case 3://///修改数据  /
		{bool found=false;
				 do
				  {cout<<"请输入您要修改的学生的姓名："<<endl;
				    cin>>nam;
				    for(int h=0;h<i&&!found;++h)
					   {if(strcmp(nam,s[h]->name)==0)
					    {cout<<"请输入新的学号:"<<endl;
					      cin>>num;
					    cout<<"请输入新的数学成绩："<<endl;
					      cin>>mat;
					    cout<<"请输入新的语文成绩："<<endl;
					     cin>>chin;
						  cout<<"请输入新的外语成绩："<<endl;
					    cin>>eng;
					   strcpy(s[h]->number,num);
					   s[h]->chinese=chin;
					   s[h]->math=mat;
					   s[h]->english=eng;
					   cout<<"数据修改成功！";found=true;
					  }
					  } 
					if(!found)
					{
                     cout<<"您要修改的学生本来就不存在！请检查重新输入！"<<endl;
					}
              cout<<"想继续修改吗(y/n)"<<endl;
              cin>>c;
            if(c!='y'&&c!='n')
			{cout<<"指令错误！请重新输入！"<<endl;
            cin>>c;
			}
		}while(c=='y');
	   system("cls");
       break;
	}
case 4:////总成绩查询
  {double t;char c;
   do
     {int flag1=0;
       cout<<"请输入你要查询学生的总成绩"<<endl;
       cin>>t;
      for(int q=0;q<i;q++)
	   {if(s[q]->getsum()==t)
         {flag1=1;
           cout<<"您要查询的学生是："<<(*s[q]).name<<endl;
         }
       }
     if(flag1==0)
       cout<<"对不起！您要查询的学生不存在！"<<endl;
       cout<<"您想继续查询吗?(y/n)"<<endl;
       cin>>c;
     if(c!='y'&&c!='n')
	  {cout<<"指令错误！请重新输入！"<<endl;
       cin>>c;
	  }
	}while(c=='y');
   system("cls");
   break;
}

case 5:////////姓名查询