Hệ thống kết quả đơn giản trong lập trình C

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main.cpp
project /

1 #include<iostream>
2 #include<fstream>
3 #include<stdio.h>
4 #include "admin.h"
5 #include "teacher.h"
6 #include "student.h"
7
8 using namespace std;
9
10 admin ad;
11
12 int main()
13 {
14   fstream fs, f;
15
16   cout<<"\n\nWelcome to Kendriya Vidyalaya Results";
17   int opt=0, subopt=0, id, found=0;
18
19   student St;
20
21   while(opt!=4)
22   {
23     cout<<"\n\nMenu:\n1. Admin\n2. Teacher: Update Marks\n3. Student: Check Results\n4. Exit\n\nEnter option: ";
24     cin>>opt;
25
26     switch(opt)
27     {
28       case 1: cout<<"\n\nSub Menu:\n1. Add teacher\n2. Add student\n\nEnter option: ";
29               cin>>subopt;
30               switch(subopt)
31               {
32                 case 1: ad.addteacher();
33                         break;
34                 case 2: ad.addstudent();
35                         break;
36                 default: cout<<"\n\nInvalid choice";
37                          break;
38               }
39               break;
40
41       case 2: cout<<"\n\nEnter teacher id: ";
42               cin>>id;
43
44               f.open("teacher.dat", ios::in);
45               teacher T; found = 0;
46
47               while(!f.eof()&&found==0)
48               {
49                 f.read((char*)&T, sizeof(T));
50
51                 if(T.idcompare(id))
52                 { T.updateMarks();
53                   found=1;
54                 }
55               }
56
57               if(found == 0)
58                 cout<<"\n\nInvalid ID";
59
60               f.close();
61               break;
62
63       case 3: cout<<"\n\nEnter student roll no: ";
64               cin>>id;
65
66               fs.open("student.dat", ios::in);
67               found = 0;
68
69               while(!fs.eof()&&found==0)
70               {
71                 fs.read((char*)&St, sizeof(St));
72
73                 if(id == St.getroll())
74                 { St.display();
75                   found=1;
76                 }
77               }
78
79               if(found == 0)
80                 cout<<"\n\nInvalid roll number";
81
82               fs.close();
83               break;
84
85       case 4: return 0;
86
87       default: cout<<"\n\nInvalid choice";
88                break;
89     }
90
91   }
92
93 return 0;
94 }