Student Report Card Project

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Student Report Card Project

Student Report Card Project

Hi guys!
I have made this "Student-report Card Project" in C++ for my project in school.
The Program works completely fine and has no errors in it.
But I do experience some problem at run-time.
This project is for making a student report card by the teacher and many other functions for the teacher to handle. And one option for showing it to the parents.
It is clear to anyone that in a class, no 2 students have the same roll. no. That's where my program gets affected. Supposedly the teacher while entering student data mistakingly enters two same roll. nos for different students. Then the file data for both the students (having same roll no) gets effected. And the effect takes place in subsequent places too. Like in the option where the teacher can edit the students marks, name etc if he/she has made a mistake while entry.

can anyone tell me how to correct this error and avoid corruption of data, even in the file where it saves all the data.

Any other help would be appreciated.

The code is put in the next text box as it the total no. of characters had exceeded the limit.

absawis (27)

//                   HEADER FILE USED IN PROJECT

#include<fstream.h>
#include<iomanip.h>
#include<stdio.h>
#include<conio.h>

//                   CLASS USED IN PROJECT

class student
{
	int rollno;
	char name[50];
	int p_marks, c_marks, m_marks, e_marks, cs_marks;
	float per;
	char grade;
	void calculate();	//function to calculate grade
public:
	void getdata();	//function to accept data from user
	void showdata();	//function to show data on screen
	void show_tabular();
	int retrollno();
}; //class ends here


void student::calculate()
{
	per=(p_marks+c_marks+m_marks+e_marks+cs_marks)/5.0;
	if(per>=60)
		grade='A';
	else if(per>=50)
		grade='B';
	else if(per>=33)
		grade='C';
	else
		grade='F';
}

void student::getdata()
{
	cout<<"\nEnter The roll number of student ";
	cin>>rollno;
	cout<<"\n\nEnter The Name of student ";
	gets(name);
	cout<<"\nEnter The marks in Physics out of 100 : ";
	cin>>p_marks;
	cout<<"\nEnter The marks in Chemistry out of 100 : ";
	cin>>c_marks;
	cout<<"\nEnter The marks in Maths out of 100 : ";
	cin>>m_marks;
	cout<<"\nEnter The marks in English out of 100 : ";
	cin>>e_marks;
	cout<<"\nEnter The marks in Computer Science out of 100 : ";
	cin>>cs_marks;
	calculate();
}

void student::showdata()
{
	cout<<"\nRoll number of Student : "<<rollno;
	cout<<"\nName of Student : "<<name;
	cout<<"\nMarks in Physics : "<<p_marks;
	cout<<"\nMarks in Chemistry : "<<c_marks;
	cout<<"\nMarks in Maths : "<<m_marks;
	cout<<"\nMarks in English : "<<e_marks;
	cout<<"\nMarks in Computer Science :"<<cs_marks;
	cout<<"\nPercentage of Student is  :"<<per;
	cout<<"\nGrade of Student is :"<<grade;
}

void student::show_tabular()
{
	cout<<rollno<<setw(6)<<" "<<name<<setw(10)<<p_marks<<setw(4)<<c_marks<<setw(4)<<m_marks<<setw(4)<<e_marks<<setw(4)<<cs_marks<<setw(6)<<per<<setw(6)<<" "<<grade<<endl;
}

int student::retrollno()
{
	return rollno;
}


//    	function declaration

void write_student();	//write the record in binary file
void display_all();		//read all records from binary file
void display_sp(int);	//accept rollno and read record from binary file
void modify_student(int);	//accept rollno and update record of binary file
void delete_student(int);	//accept rollno and delete selected records from binary file
void class_result();	//display all records in tabular format from binary file
void result();	//display result menu
void intro();	//display welcome screen
void entry_menu();	//display entry menu on screen

//    	THE MAIN FUNCTION OF PROGRAM

int main()
{
	char ch;
	cout.setf(ios::fixed|ios::showpoint);
	cout<<setprecision(2); // program outputs decimal number to two decimal places
	clrscr();
	intro();
	do
	{
		clrscr();
		cout<<"\n\n\n\tMAIN MENU";
		cout<<"\n\n\t01. RESULT MENU";
		cout<<"\n\n\t02. ENTRY/EDIT MENU";
		cout<<"\n\n\t03. EXIT";
		cout<<"\n\n\tPlease Select Your Option (1-3) ";
		cin>>ch;
		clrscr();
		switch(ch)
		{
			case '1': result();
				break;
			case '2': entry_menu();
				break;
			case '3':
				break;
			default :cout<<"\a";
		}
	 }while(ch!='3');
	return 0;
}

//    	function to write in file

void write_student()
{
	student st;
	ofstream outFile;
	outFile.open("student.dat",ios::binary|ios::app);
	st.getdata();
	outFile.write((char *) &st, sizeof(student));
	outFile.close();
	 cout<<"\n\nStudent record Has Been Created ";
	cin.ignore();
	getch();
}

//    	function to read all records from file

void display_all()
{
	student st;
	ifstream inFile;
	inFile.open("student.dat",ios::binary);
	if(!inFile)
	{
		cout<<"File could not be open !! Press any Key...";

		getch();
		return;
	}
	cout<<"\n\n\n\t\tDISPLAY ALL RECORD !!!\n\n";
	while(inFile.read((char *) &st, sizeof(student)))
	{
		st.showdata();
		cout<<"\n\n====================================\n";
	}
	inFile.close();

	getch();
}

//    	function to read specific record from file

void display_sp(int n)
{
	student st;
	ifstream inFile;
	inFile.open("student.dat",ios::binary);
	if(!inFile)
	{
		cout<<"File could not be opened !! Press any Key...";

		getch();
		return;
	}
	int flag=0;
	while(inFile.read((char *) &st, sizeof(student)))
	{
		if(st.retrollno()==n)
		{
			 st.showdata();
			 flag=1;
		}
	}
	inFile.close();
	if(flag==0)
		cout<<"\n\nRecord does not exist";

	getch();
}

//    	function to modify record of file

void modify_student(int n)
{
	int found=0;
	student st;
	fstream File;
	File.open("student.dat",ios::binary|ios::in|ios::out);
	if(!File)
	{
		cout<<"File could not be opened !! Press any Key...";

		getch();
		return;
	}

	while(File.read((char *) &st, sizeof(student)) && found==0)
	{
		if(st.retrollno()==n)
		{
			st.showdata();
			cout<<"\n\nPlease Enter The New Details of Student"<<endl;
			st.getdata();
			 int pos=(-1)*sizeof(st);
			 File.seekp(pos,ios::cur);
			 File.write((char *) &st, sizeof(student));
			 cout<<"\n\n\t Record Updated";
			 found=1;
		}
	}
	File.close();
	if(found==0)
		cout<<"\n\n Record Not Found ";
	getch();
}

//    	function to delete record of file

void delete_student(int n)
{
	student st;
	ifstream inFile;
	inFile.open("student.dat",ios::binary);
	if(!inFile)
	{
		cout<<"File could not be opened !! Press any Key...";
		getch();
		return;
	}
	ofstream outFile;
	outFile.open("Temp.dat",ios::out);
	inFile.seekg(0,ios::beg);
	while(inFile.read((char *) &st, sizeof(student)))
	{
		if(st.retrollno()!=n)
		{
			outFile.write((char *) &st, sizeof(student));
		}
	}
	outFile.close();
	inFile.close();
	remove("student.dat");
	rename("Temp.dat","student.dat");
	cout<<"\n\n\tRecord Deleted ...";

	getch();
}

//    	function to display all students grade report

void class_result()
{
	student st;
	ifstream inFile;
	inFile.open("student.dat",ios::binary);
	if(!inFile)
	{
		cout<<"File could not be opened !! Press any Key...";

		getch();
		return;
	}
	cout<<"\n\n\t\tALL STUDENTS RESULT \n\n";
	cout<<"==========================================================\n";
	cout<<"R.No       Name        P   C   M   E   CS   %age   Grade"<<endl;
	cout<<"==========================================================\n";
	while(inFile.read((char *) &st, sizeof(student)))
	{
		st.show_tabular();
	}

	getch();
	inFile.close();
}

//    	function to display result menu

void result()
{
	char ch;
	int rno;
	cout<<"\n\n\n\tRESULT MENU";
	cout<<"\n\n\n\t1. Class Result";
	cout<<"\n\n\t2. Student Report Card";
	cout<<"\n\n\t3. Back to Main Menu";
	cout<<"\n\n\n\tEnter Choice (1/2/3)? ";
	cin>>ch;
	clrscr();
	switch(ch)
	{
	case '1' :	class_result(); break;
	case '2' :	cout<<"\n\n\tEnter Roll Number Of Student : "; cin>>rno;
				display_sp(rno); break;
	case '3' :	break;
	default:	cout<<"\a";
	}
}

//    	INTRODUCTION FUNCTION

void intro()
{
	cout<<"\n\n\n\t\t  STUDENT";
	cout<<"\n\n\t\tREPORT CARD";
	cout<<"\n\n\t\t  PROJECT";
	cout<<"\n\n\n\tMADE BY : ABS";
	cout<<"\n\tSCHOOL : AWIS";
	getch();
}

//    	ENTRY / EDIT MENU FUNCTION

void entry_menu()
{
	char ch;
	int num;
	clrscr();
	cout<<"\n\n\n\tENTRY MENU";
	cout<<"\n\n\t1.CREATE STUDENT RECORD";
	cout<<"\n\n\t2.DISPLAY ALL STUDENTS RECORDS";
	cout<<"\n\n\t3.SEARCH STUDENT RECORD ";
	cout<<"\n\n\t4.MODIFY STUDENT RECORD";
	cout<<"\n\n\t5.DELETE STUDENT RECORD";
	cout<<"\n\n\t6.BACK TO MAIN MENU";
	cout<<"\n\n\tPlease Enter Your Choice (1-6) ";
	cin>>ch;
	clrscr();
	switch(ch)
	{
	case '1':	write_student(); break;
	case '2':	display_all(); break;
	case '3':	cout<<"\n\n\tPlease Enter The roll number "; cin>>num;
				display_sp(num); break;
	case '4':	cout<<"\n\n\tPlease Enter The roll number "; cin>>num;
				modify_student(num);break;
	case '5':	cout<<"\n\n\tPlease Enter The roll number "; cin>>num;
				delete_student(num);break;
	case '6':	break;
	default:	cout<<"\a"; entry_menu();
	}
}
//   END OF PROJECT

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