How Do I Display The Record That Has Been Created

001	#include<iostream>
002	#include<fstream>
003	#include<iomanip>
004	using namespace std;
005	 
006	 
007	class student
008	{
009	        protected:
010	        char name[50];
011	//      int p_marks, c_marks, m_marks, e_marks, cs_marks;
012	//      double per;
013	//      char grade;
014	//      void calculate();       //function to calculate grade
015	public:
016	        int rollno;
017	        virtual void getdata();         //function to accept data from user
018	        virtual void showdata() ;       //function to show data on screen
019	//      friend void show_tabular();
020	        int retrollno() ;
021	}; //class ends here
022	 
023	class marks:public student
024	{
025	         int p_marks, c_marks, m_marks, e_marks, cs_marks;
026	        double per;
027	        char grade;
028	        void calculate();
029	        public:
030	                //int retrollno();
031	                void getdata();
032	                void showdata();
033	                //friend void show_tabular();
034	 
035	};
036	 
037	 
038	void marks::calculate()
039	{
040	        per=(p_marks+c_marks+m_marks+e_marks+cs_marks)/5.0;
041	        if(per>=60)
042	                grade='A';
043	        else if(per>=50)
044	                grade='B';
045	        else if(per>=33)
046	                grade='C';
047	        else
048	                grade='F';
049	}
050	 
051	void student::getdata()
052	{
053	        cout<<"\nEnter The roll number of student ";
054	        cin>>rollno;
055	        cout<<"\n\nEnter The Name of student ";
056	 
057	        cin>>name;
058	}
059	void marks::getdata()
060	{
061	 
062	        cout<<"\nEnter The marks in physics out of 100 : ";
063	        cin>>p_marks;
064	        cout<<"\nEnter The marks in chemistry out of 100 : ";
065	        cin>>c_marks;
066	        cout<<"\nEnter The marks in maths out of 100 : ";
067	        cin>>m_marks;
068	        cout<<"\nEnter The marks in english out of 100 : ";
069	        cin>>e_marks;
070	        cout<<"\nEnter The marks in computer science out of 100 : ";
071	        cin>>cs_marks;
072	        calculate();
073	}
074	 
075	void marks::calculate()
076	{
077	        per=(p_marks+c_marks+m_marks+e_marks+cs_marks)/5.0;
078	        if(per>=60)
079	                grade='A';
080	        else if(per>=50)
081	                grade='B';
082	        else if(per>=33)
083	                grade='C';
084	        else
085	                grade='F';
086	}
087	 
088	void student::getdata()
089	{
090	        cout<<"\nEnter The roll number of student ";
091	        cin>>rollno;
092	        cout<<"\n\nEnter The Name of student ";
093	 
094	        cin>>name;
095	}
096	void marks::getdata()
097	{
098	 
099	        cout<<"\nEnter The marks in physics out of 100 : ";
100	        cin>>p_marks;
101	        cout<<"\nEnter The marks in chemistry out of 100 : ";
102	        cin>>c_marks;
103	        cout<<"\nEnter The marks in maths out of 100 : ";
104	        cin>>m_marks;
105	        cout<<"\nEnter The marks in english out of 100 : ";
106	        cin>>e_marks;
107	        cout<<"\nEnter The marks in computer science out of 100 : ";
108	        cin>>cs_marks;
109	        calculate();
110	}
111	 
112	void student::showdata()
113	{
114	        cout<<"\nRoll number of student : "<<rollno;
115	        cout<<"\nName of student : "<<name;
116	}
117	void marks::showdata()
118	{
119	        cout<<"\nMarks in Physics : "<<p_marks;
120	        cout<<"\nMarks in Chemistry : "<<c_marks;
121	        cout<<"\nMarks in Maths : "<<m_marks;
122	        cout<<"\nMarks in English : "<<e_marks;
123	        cout<<"\nMarks in Computer Science :"<<cs_marks;
124	        cout<<"\nPercentage of student is  :"<<per;
125	        cout<<"\nGrade of student is :"<<grade;
126	}
127	 
128	//show_tabular()
129	//{
130	//      cout<<rollno<<setw(6)<<" "<<name<<setw(10)<<p_marks<<setw(4)<<c_marks<<setw(4)<<m_marks<<setw(4)
131	//              <<e_marks<<setw(4)<<cs_marks<<setw(8)<<per<<setw(6)<<grade<<endl;
132	//}
133	 
134	int student::retrollno()
135	{
136	        return rollno;
137	}
138	 
139	 
140	//***************************************************************
141	//      function declaration
142	//****************************************************************
143	 
144	void write_student();   //write the record in binary file
145	void display_all();     //read all records from binary file
146	void display_sp(int);   //accept rollno and read record from binary file
147	void modify_student(int);       //accept rollno and update record of binary file
148	void delete_student(int);       //accept rollno and delete selected records from binary file
149	void class_result();    //display all records in tabular format from binary file
150	void result();          //display result menu
151	void intro();           //display welcome screen
152	void entry_menu();      //display entry menu on screen
153	 
154	 
155	//***************************************************************
156	//      THE MAIN FUNCTION OF PROGRAM
157	//****************************************************************
158	 
159	 
160	int main()
161	{
162	        char ch;
163	        cout.setf(ios::fixed|ios::showpoint);
164	        cout<<setprecision(2); // program outputs decimal number to two decimal places
165	        intro();
166	        do
167	        {
168	 
169	                cout<<"\n\n\n\tMAIN MENU";
170	                cout<<"\n\n\t01. RESULT MENU";
171	                cout<<"\n\n\t02. ENTRY/EDIT MENU";
172	                cout<<"\n\n\t03. EXIT";
173	                cout<<"\n\n\tPlease Select Your Option (1-3) ";
174	                cin>>ch;
175	                switch(ch)
176	 
177	      {
178	                        case '1': result();
179	                                break;
180	                        case '2': entry_menu();
181	                                break;
182	                        case '3':
183	                                break;
184	                        default :cout<<"\a";
185	                }
186	    }while(ch!='3');
187	        return 0;
188	}
189	 
190	//***************************************************************
191	//      function to write in file
192	//****************************************************************
193	 
194	void write_student()
195	{
196	        marks st;
197	        student st2;
198	        ofstream outFile;
199	        outFile.open("student.dat",ios::binary|ios::app);
200	        st2.getdata();
201	        st.getdata();
202	        outFile.write(reinterpret_cast<char> (&st), sizeof(student));
203	        outFile.close();
204	        cout<<"\n\nStudent record Has Been Created ";
205	        cin.ignore();
206	        cin.get();
207	}
208	 
209	//***************************************************************
210	//      function to read all records from file
211	//****************************************************************void display_all()
212	{
213	        student st2;
214	        marks st;
215	        ifstream inFile;
216	        inFile.open("student.dat",ios::binary);
217	        if(!inFile)
218	        {
219	                cout<<"File could not be open !! Press any Key...";
220	                cin.ignore();
221	                cin.get();
222	                return;
223	        }
224	        cout<<"\n\n\n\t\tDISPLAY ALL RECORD !!!\n\n";
225	        while(inFile.read(reinterpret_cast<char> (&st), sizeof(student)))
226	        {
227	                st2.showdata();
228	                st.showdata();
229	                cout<<"\n\n====================================\n";
230	        }
231	        inFile.close();
232	        cin.ignore();
233	        cin.get();
234	}
235	 
236	//***************************************************************
237	//      function to read specific record from file
238	//****************************************************************
239	 
240	void display_sp(int n)
241	{
242	        cout<<n<<"\n";
243	        marks st;
244	        student st2;
245	        ifstream inFile;
246	        inFile.open("student.dat",ios::binary);
247	 if(!inFile)
248	        {
249	                cout<<"File could not be open !! Press any Key...";
250	                cin.ignore();
251	                cin.get();
252	                return;
253	        }
254	        bool flag=false;
255	        while(inFile.read(reinterpret_cast<char> (&st), sizeof(student)))
256	        {
257	cout<<"THEEEEEEEEEEEEE\n";// i did these two lines to know where im wrong
258	cout<<st.rollno<<"\n";//the ouput of this line is 49 no matter which roll no is entered
259	if(st2.retrollno()==n)
260	                {
261	                        cout<<st2.rollno;
262	                         st2.showdata();
263	                        st.showdata();
264	                         flag=true;
265	                }
266	        }
267	        inFile.close();
268	        if(flag==false)
269	                cout<<"\n\nrecord not exist";
270	        cin.ignore();
271	        cin.get();
272	}
273	 
274	//***************************************************************
275	//      function to modify record of file
276	//****************************************************************
277	 
278	void modify_student(int n)
279	{
280	        bool found=false;
281	        marks st;
282	        student st2;
283	        fstream File;
284	        File.open("student.dat",ios::binary|ios::in|ios::out);
285	        if(!File)
286	        {
287	                cout<<"File could not be open !! Press any Key...";
288	                cin.ignore();
289	                cin.get();
290	                return;
291	        }
292	        while(!File.eof() && found==false)
293	        {
294	 
295	                File.read(reinterpret_cast<char> (&st), sizeof(student));
296	                if(st.retrollno()==n)
297	                {
298	                        st2.showdata();
299	                        st.showdata();
300	                        cout<<"\n\nPlease Enter The New Details of student"<<endl;
301	                        st2.getdata();
302	                        st.getdata();
303	                        int pos=(-1)*static_cast<int>(sizeof(st));
304	                        File.seekp(pos,ios::cur);
305	                        File.write(reinterpret_cast<char> (&st), sizeof(student));
306	                        cout<<"\n\n\t Record Updated";
307	                        found=true;
308	                }
309	        }
310	        File.close();
311	        if(found==false)
312	                cout<<"\n\n Record Not Found ";
313	        cin.ignore();
314	        cin.get();
315	}
316	 
317	//***************************************************************
318	//      function to delete record of file
319	//****************************************************************
320	 
321	void delete_student(int n)
322	{
323	 
324	        marks st;
325	        ifstream inFile;
326	        inFile.open("student.dat",ios::binary);
327	        if(!inFile)
328	        {
329	                cout<<"File could not be open !! Press any Key...";
330	                cin.ignore();
331	                cin.get();
332	                return;
333	        }
334	        ofstream outFile;
335	        outFile.open("Temp.dat",ios::out);
336	        inFile.seekg(0,ios::beg);
337	        while(inFile.read(reinterpret_cast<char> (&st), sizeof(student)))
338	        {
339	                if(st.retrollno()!=n)
340	                {
341	                        outFile.write(reinterpret_cast<char> (&st), sizeof(student));
342	                }
343	        }
344	        outFile.close();
345	        inFile.close();
346	        remove("student.dat");
347	        rename("Temp.dat","student.dat");
348	        cout<<"\n\n\tRecord Deleted ..";
349	        cin.ignore();
350	        cin.get();
351	}
352	 
353	//***************************************************************
354	//      function to display all students grade report
355	//****************************************************************
356	 
357	void class_result()
358	{
359	 
360	        marks st;
361	        ifstream inFile;
362	        inFile.open("student.dat",ios::binary);
363	        if(!inFile)
364	        {
365	                cout<<"File could not be open !! Press any Key...";
366	                cin.ignore();
367	                cin.get();
368	                return;
369	        }
370	        cout<<"\n\n\t\tALL STUDENTS RESULT \n\n";
371	        cout<<"==========================================================\n";
372	        cout<<"R.No       Name        P   C   M   E   CS   %age   Grade"<<endl;
373	        cout<<"==========================================================\n";
374	        //while(inFile.read(reinterpret_cast<char> (&st), sizeof(student)))
375	        //{
376	        //      st.show_tabular();
377	        //}
378	        cin.ignore();
379	        cin.get();
380	        inFile.close();
381	}
382	 
383	//***************************************************************
384	//      function to display result menu
385	//****************************************************************
386	 
387	void result()
388	{
389	        char ch;
390	        int rno;
391	marks st;
392	        cout<<"\n\n\n\tRESULT MENU";
393	        cout<<"\n\n\n\t1. Class Result";        cout<<"\n\n\t2. Student Report Card";
394	        cout<<"\n\n\t3. Back to Main Menu";
395	        cout<<"\n\n\n\tEnter Choice (1/2/3)? ";
396	        cin>>ch;
397	 
398	        switch(ch)
399	        {
400	        case '1' :      class_result(); break;
401	        case '2' :      cout<<"\n\n\tEnter Roll Number Of Student : "; cin>>rno;st.rollno=rno;
402	                                display_sp(rno); break;
403	        case '3' :      break;
404	        default:        cout<<"\a";
405	        }
406	}
407	 
408	//***************************************************************
409	//      INTRODUCTION FUNCTION
410	//****************************************************************
411	 
412	void intro()
413	{
414	        cout<<"\n\n\n\t\t  STUDENT";
415	        cout<<"\n\n\t\tREPORT CARD";
416	        cout<<"\n\n\t\t  PROJECT";
417	 
418	        cout<<"\n\n\n\tMADE BY : SULABH AGRAWAL";
419	        cout<<"\n\tSCHOOL : CAMBRIDGE SCHOOL";
420	        cin.get();
421	}
422	 
423	//***************************************************************
424	//      ENTRY / EDIT MENU FUNCTION
425	//****************************************************************
426	 
427	void entry_menu()
428	{
429	        char ch;
430	        int num;
431	        cout<<"\n\n\n\tENTRY MENU";
432	        cout<<"\n\n\t1.CREATE STUDENT RECORD";
433	        cout<<"\n\n\t2.DISPLAY ALL STUDENTS RECORDS";
434	        cout<<"\n\n\t3.SEARCH STUDENT RECORD ";
435	        cout<<"\n\n\t4.MODIFY STUDENT RECORD";
436	        cout<<"\n\n\t5.DELETE STUDENT RECORD";
437	        cout<<"\n\n\t6.BACK TO MAIN MENU";
438	        cout<<"\n\n\tPlease Enter Your Choice (1-6) ";
439	        cin>>ch;
440	 
441	        switch(ch)
442	{
443	        case '1':       write_student(); break;
444	        case '2':       display_all(); break;
445	        case '3':       cout<<"\n\n\tPlease Enter The roll number "; cin>>num;
446	                        display_sp(num); break;
447	        case '4':       cout<<"\n\n\tPlease Enter The roll number "; cin>>num;
448	                        modify_student(num);break;
449	        case '5':       cout<<"\n\n\tPlease Enter The roll number "; cin>>num;
450	                        delete_student(num);break;
451	        case '6':       break;
452	        default:        cout<<"\a"; entry_menu();
453	        }
454	}