index.cpp

#include<fstream>
#include<stdio.h>
#include<iostream>
#include<cstring>

using namespace std;

void ShowRecord();

class STUDENT
{
private:
	int ST_ID;
	char ST_Name[50];
	float ST_Marks;
public:
	int GETST_ID()
	{
		return ST_ID;
	}
	void ReadDetails()
	{
		cout<<"\tEnter Student ID : ";
		cin>>ST_ID;
		cin.ignore();
		cout<<" \tEnter Name of Student : ";
		cin.getline(ST_Name,50);
		cout<<"\tEnter SGPA : ";
		cin>>ST_Marks;
	}

	void ShowDetails()
	{
		cout<<"\tID student : "<<ST_ID<<endl;
		cout<<"\tStudent Name : "<<ST_Name<<endl;
		cout<<"\tStudent SGPA : "<<ST_Marks<<endl;
	}

	void ADDRECORD()
	{
		fstream fin;
		fin.open("Student.dat",ios::in|ios::binary|ios::app);
		STUDENT S;
		S.ReadDetails();
		fin.write((char*)&S,sizeof(S));;
		fin.close();
	}


	void SEARCH(int id)
	{ 
		STUDENT S;
		int flag=0;
		fstream fin;
		fin.open("Student.dat",ios::in|ios::binary|ios::app) ;
		while(fin.read((char*)&S,sizeof(S)))
		{
			if(id==S.GETST_ID())
			{
				if(flag == 0)
				cout<<"\n\t**Data Found**\n";
				S.ShowDetails();
				cout<<endl;
				flag=1;
			}
		} 
		fin.close();
		if(flag!=1)
			 cout<<"\t***No match Found***";
	}

	void DELETE()
	{
		int dID,choice3;
		STUDENT S;
		int ff=0;
		label2:
		cout<<"\tEnter The Student ID whose record is to be DELETED : ";
		cin>>dID;
		fstream fin2;
		fin2.open("temp.dat",ios::out|ios::binary|ios::in|ios::app);
		fstream fin;
		fin.open("Student.dat",ios::in|ios::binary|ios::app);
		while(fin.read((char*)&S,sizeof(S)))
		{
			if(dID==S.GETST_ID())
			{ 
				cout<<"\n\tDATA FOUND : "<<endl;
				ff=1;
				S.ShowDetails();
			}
			else
				fin2.write((char*)&S,sizeof(S)) ;
		}
		if(ff==0)
		{
			cout<<"\n\tDATA NOT FOUND\n\n";
		}
		else
		{
			cout<<"\n\tDo You Want to continue (1 for YES and 0 for NO) : ";
			cin>>choice3;
			if(choice3==1)
			{
				fin2.close();
				fin.close();
				remove("Student.dat");
				rename("temp.dat","Student.dat");
				cout<<endl;
			}
	}
	}
	void MODIFY()
	{
		cout<<"\tEnter new details \n\n";
		int NewID;
		char Newname[50];
		float Newmarks;
		cout<<"\tEnter new Student ID : ";
		cin>>NewID;
		cout<<"\tEnter new Student's Name : ";
		cin.ignore();
		cin.getline(Newname,50);
		cout<<"\tEnter new Student's SGPA : ";
		cin>>Newmarks;
		ST_ID=NewID;
		strcpy(ST_Name,Newname);
		ST_Marks=Newmarks;
		cout<<"\n\tData Updated. Thank You.\n";
	}
};

void ShowRecord()
{
	STUDENT S;
	fstream fin;
	int ff=0;
	fin.open("Student.dat",ios::in|ios::binary|ios::app) ;
	while(fin.read((char*)&S,sizeof(S)))
	{
		ff=1;
		S.ShowDetails();
		cout<<endl;
	}
	fin.close();
	if(ff==0)
		cout<<"\tNO DATA FOR NOW\n";
}

int main()
{
	cout<<"\t\t***STUDENT'S RECORD***\n";
	label:
	STUDENT S;
	int choice,sID;
	char choice2;
	cout<<"\tEnter Your Choice"<<endl;
	cout<<"\t1.Add Record of Student \n\t2.Search for Student \n\t3. Delete a particular record \n\t4.Modify a record \n\t5. See All Records\n\t6.Exit\n\n\tYour Choice : ";
	cin>>choice;
	if(choice == 6)
		return 0;
	if(choice==1)
	{
		S.ADDRECORD();
		cout<<"\n\tDo you want to see all records (Y) : ";
		cin>>choice2;
		if(choice2=='Y' || choice2=='y')
			ShowRecord();
		cout<<endl;
		cout<<endl<<endl;
		goto label;
	}
	else if(choice==2)
	{
		cout<<"\n\tEnter the Student ID to be Searched : ";
		cin>>sID;
		S.SEARCH(sID);
		cout<<endl;cout<<endl<<endl;
		goto label;
	}
	else if(choice==3)
	{
	 	S.DELETE();
		cout<<endl;
		cout<<endl<<endl;
		goto label;
	}
	else if (choice==4)
	{
		fstream fin;
		fin.open("Student.dat",ios::in|ios::out|ios::binary|ios::app);
		fin.seekg(0);
		int MID,location;
		cout<<"\n\tEnter Student ID  to modify : ";
		cin>>MID;
		while(fin.read((char*)&S,sizeof(S)))
		{
			location=fin.tellg();
			if(MID==S.GETST_ID())
			{
				S.MODIFY();
				fin.seekg(location);
				fin.write((char*)&S,sizeof(S));
			}
		}
		fin.close();
		cout<<endl<<endl;
		goto label;
	}
	else if(choice==5)
	{
		ShowRecord();
		cout<<endl<<endl;
		goto label;
	}
	else  return 0;
}