Code: #include<iostream> #include<fstream> #include<string> struct emp{ int eno; char name[50],address[50]; float basic,allowence,deduction; }; void addEmp(); //adds new record to data file void disEmp(); //displays all records from file void delEmp(); //asks empNo and removes that record from file void updEmp(); //asks empno and lets you reenter that data void cls(); //just clear screen int main(){ string dummy; int choice; cout<<"===== Main Menu ====="<<endl; cout<<endl<<endl; cout<<"1 -> Add Record "<<endl; cout<<"2 -> Display Record"<<endl; cout<<"3 -> Delete Record"<<endl; cout<<"4 -> Update Record"<<endl; cout<<endl; cout<<"0 -> Exit"<<endl; cout<<endl<<endl<<"Selection "; cin>>choice; if(choice<0 || choice>4){ cls(); main(); } switch(choice){ case 0: break; case 1: addEmp(); break; case 2: disEmp(); break; case 3: delEmp(); break; case 4: updEmp(); break; } } void addEmp(){ fstream data; string dummy; emp e; int choice; do{ cls(); cout<<"===== Enter New Record ====="<<endl; cout<<endl<<endl; cout<<"Eno :\t\t"; cin>>e.eno; getline(cin,dummy); //just to clear input buffer cout<<"\nName :\t\t"; gets_s(e.name,50); cout<<"\nAddress :\t"; gets_s(e.address,50); cout<<"\nBasic Salary :\t";cin>>e.basic; cout<<"\nAllowence :\t";cin>>e.allowence; cout<<"\nDeductions :\t";cin>>e.deduction; cout<<endl<<endl; cout<<"1 -> Save | 2 -> Cancel"<<endl; cin>>choice; }while(!(choice==1 || choice==2)); if(choice==1){ data.open("data.dat",ios::out|ios::app); data.write((char*)&e,sizeof(e)); data.close(); cout<<"\nRecord Saved "<<endl<<endl; }else{ cout<<"\n\nRecord Cancelled"<<endl<<endl; } cout<<"Enter another record?"<<endl; cout<<"1 -> Yes | 2 -> No"<<endl; cin>>choice; if(choice==1) addEmp(); else return; main(); } void disEmp(){ fstream data; emp e; data.open("data.dat",ios::in); cls(); while(data.read((char*) &e, sizeof(e))){ cout<<"\n\n-----Displaying record for ENO " <<e.eno<<endl; cout<<"\nName :\t\t"<<e.name; cout<<"\nAddress :\t"<<e.address; cout<<"\nBasic Salary :\t"<<e.basic; cout<<"\nAllowence :\t"<<e.allowence; cout<<"\nDeductions :\t"<<e.deduction<<endl; cout<<endl<<"\nTotal Salary :\t"<<e.basic+e.allowence; cout<<"\nNet Paid :\t"<<e.basic+e.allowence-e.deduction; cout<<endl; } data.close(); main(); } void delEmp(){ fstream data, temp; emp e; int eno; cls(); cout<<"===== Delete Record ====="<<endl; cout<<endl<<endl<<endl; cout<<"Enter ENO to delete record ";cin>>eno; rename("data.dat","temp.dat"); data.open("data.dat",ios::app); temp.open("temp.dat",ios::in); temp.seekg(0,ios::beg); while(temp.read((char*)&e,sizeof(e))){ if(!(e.eno==eno)){ cout<<"Record to delete "<<e.eno; data.write((char*) &e,sizeof(e)); } } data.close(); temp.close(); system("Del temp.dat"); main(); } void updEmp(){ fstream data, temp; emp e; string dummy; int eno; cls(); cout<<"===== Update Record ====="<<endl; cout<<endl<<endl<<endl; cout<<"Enter ENO :_";cin>>eno; rename("data.dat","temp.dat"); data.open("data.dat",ios::app); temp.open("temp.dat",ios::in); temp.seekg(0,ios::beg); while(temp.read((char*)&e,sizeof(e))){ if(e.eno==eno){ cout<<"-----Current data for ENO: "<<e.eno; cout<<"\nName :\t\t"<<e.name; cout<<"\nAddress :\t"<<e.address; cout<<"\nBasic Salary :\t"<<e.basic; cout<<"\nAllowence :\t"<<e.allowence; cout<<"\nDeductions :\t"<<e.deduction<<endl; cout<<endl<<"\nTotal Salary :\t"<<e.basic+e.allowence; cout<<"\nNet Paid :\t"<<e.basic+e.allowence-e.deduction; cout<<endl<<endl; cout<<"-----Enter New Values-----"<<endl; cout<<"\nEno :\t\t"; cin>>e.eno; getline(cin,dummy); //just to clear input buffer cout<<"\nName :\t\t"; gets_s(e.name,50); cout<<"\nAddress :\t"; gets_s(e.address,50); cout<<"\nBasic Salary :\t";cin>>e.basic; cout<<"\nAllowence :\t";cin>>e.allowence; cout<<"\nDeductions :\t";cin>>e.deduction; } data.write((char*) &e,sizeof(e)); } data.close(); temp.close(); system("Del temp.dat"); main(); } void cls(){ for (int i=0;i<50;i++) cout<<"\n"; } At least must answer one. Please Comment each and every line in this program. Also how to convert this C++ object-oriented code in just C++ so that it could be complied on "Turbo C++ IDE" i.e. it can be able to use header files of .h extesion. Thanks in advance. Thanks a lot.