C++ program to show binary file operation using classes and Objects and perform Addition, Deletion, Modification, searching, Display of records.

/*	Program to write student record using class and binary files
	made by		: rakesh kumar
*/

#include
#include
#include
using namespace std;
class student{
	private:
			int roll;
			char name[30];
			char address[100];
	public:
			void input(){
				fflush(stdin);
				cout<<"\n Enter Roll No:"; cin>>roll;
				fflush(stdin);
				cout<<"\n Enter Name :"; cin>>name;
				fflush(stdin);
				cout<<"\n Enter address :"; cin>>address;
			
			}
			void output(){
				cout<<"\n\n Roll No :"<<roll;
				cout<<"\n Name :"<<name;
				cout<<"\n Address :"<<address;
			}
			int ret_roll()
			{
				return roll;				
			}
			
};

//global functions to write data in a binary file
void write_data()
{
	ofstream fout("student.dat",ios::app|ios::binary);
	student s;
	s.input();
	fout.write((char*)&s,sizeof(student));
	fout.close();
}

//global functions to write data in a binary file
void read_data()
{
	ifstream fin("student.dat",ios::binary);
	student s;
	while(fin.read((char*)&s,sizeof(student)))
	    s.output();   
		
	fin.close();
}

//global function to modify record in a binary file
void modify_data()
{
	int troll;
	int found=0;
	student s;
	ofstream fout("temp.dat",ios::binary);
	ifstream fin("student.dat",ios::binary);
	cout<<"\n Enter roll No to modify :"; cin>>troll;
	while(fin.read((char*)&s,sizeof(student)))
	  {
	  	 if(troll==s.ret_roll())
	  	    {			  
	  	   	    cout<<"\n Enter New Values \n";
				s.input();
				found++;
			}
		fout.write((char*)&s,sizeof(student));
	  }
	fin.close();
	fout.close();
	
	remove("student.dat");
	rename("temp.dat","student.dat");
	
	if(found!=0)
		cout<<"\n Record Modified....";
	else
		cout<<"\n Record does not exist...";
}

//global function to delete record from a binary file
void delete_data()
{
	int troll;
	int found=0;
	student s;
	ofstream fout("temp.dat",ios::binary);
	ifstream fin ("student.dat",ios::binary);
	cout<<"\n Enter roll No to delele :"; cin>>troll;
	while(fin.read((char*)&s,sizeof(student)))
	  {
	  	 if(troll!=s.ret_roll())
	  	    fout.write((char*)&s,sizeof(student));
	  }
	fin.close();
	fout.close();
	
	remove("student.dat");
	rename("temp.dat","student.dat");
	
	if(found!=0)
		cout<<"\n Record Deleted....";
	else
		cout<<"\n Record does not exist...";
}


int main(){
	int choice;
	do{
		system("cls");
		cout<<"\n\n\n\n\t\t\t File operations";
		cout<<"\n\n\t\t\t1.	Add New Record";
		cout<<"\n\n\t\t\t2.	Modify Record";
		cout<<"\n\n\t\t\t3.	Delete Record";
		cout<<"\n\n\t\t\t4.	Display Records";
		cout<<"\n\n\t\t\t5.	Quit Application";
		cout<<"\n\n\n\n\t\t Enter your choice (1..5) :"; cin>>choice;
		switch(choice)
		 {
		 	case 1:		
			 			write_data(); 
			 			break;
		 	case 2:		
			 			modify_data();
		 				break;
		 	case 3:
		 				delete_data();
		 				break;
		 	case 4:
		 				read_data();
		 				getch();
		 				break;
		 	case 5:		
			 			break;
			default:
		 				cout<<"\n Wrong Choice....Try again";
		 				getch();
		 }
	}while(choice!=5);
	return 0;
}

The output of the program is as follows. The whole program was developed on Windows 10 using Dev C++ IDE.

Though we tried our best to keep our code clean. If you need any explanation of above code. Do not hesitate to contact us.