Hệ thống kết quả đơn giản trong lập trình C

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teacher.h
project /

1 #ifndef TEACHER_H
2 #define TEACHER_H
3
4 #include<fstream>
5 #include"student.h"
6 #include<iostream>
7
8 using namespace std;
9 class teacher
10 {
11   char name[20];
12   char subject[20];
13   int subcode;
14   int teacherid;
15 public:
16   void input()
17   {
18     cout<<"\nEnter the name of teacher: ";
19     cin>>name;
20     cout<<"Enter teacher id number: ";
21     cin>>teacherid;
22     cout<<"\nEnter subject name: ";
23     cin>>subject;
24     cout<<"\nEnter subject code (1-5): ";
25     cin>>subcode;
26     subcode = subcode-1;
27   }
28
29   int idcompare(int id)
30   {
31     if(teacherid == id)
32       return 1;
33
34       else
35         return 0;
36   }
37
38   void display()
39   {
40     cout<<"\nName of teacher: ";
41     puts(name);
42     cout<<"Teacher id number: "<<teacherid;
43     cout<<"\nSubject name: ";
44     puts(subject);
45     cout<<"Subject code: "<<subcode;
46   }
47
48   void updateMarks()
49   {
50     fstream fio("student.dat", ios::in|ios::out|ios::binary);
51     int count = 0, marks;
52     student S;
53     long pos;
54
55     cout<<"\n\nUpload marks of all students for the subject "<<subject;
56
57     pos = fio.tellg();
58
59     while(fio.read((char*)&S,sizeof(S)))
60     {
61       cout<<"\nEnter marks of student roll number "<<S.getroll()<<" : ";
62       cin>>marks;
63       S.entermarks(subcode, marks);
64       fio.seekp(pos);
65       fio.write((char*)&S,sizeof(S));
66       count++;
67       pos = fio.tellg();
68     }
69
70     if(count == 0)
71       cout<<"\n\nNo students enrolled";
72
73     else
74       cout<<"\nAll student marks have been uploaded successfully";
75
76       fio.close();
77   }
78 };
79
80 #endif