#include <iostream>
#include <fstream>

using namespace std;

// global variable storing the names and tel no.
string names[100];
string tel[100];

int readFile(){	// read the names and tel no. from the text file
        int i=0;	// count the total number of records read from the text file
        ifstream f("q7.txt");
        do{
		// ....	
	




        }while(!f.eof());	// !f.eof() --> not end of file yet

        f.close();
        return i-1;	// avoid count extra record;

}

void writeFile(int total){	// save the updated data back to the text file for permanent storage
	




}
void listRecord(int total){


}
int insertRecord(int total){
        if(_________________){
                cout << "The storage is full!" << endl;
                return __________;
        }
        else{
                cout << "Inserting record..." << endl;
		// ...



                return __________;
        }
}
int deleteRecord(int total){

	// declare some variables ...

        if(total==____){
                cout << "The storage is empty" << endl;
                return ____;
        }
        else{
                cout << "Deleting record..." << endl;
		// get the name to delete
		// ...


		// search the name
		// ...



                if(__________________){
                        cout << "Name Not Found" << endl;
                        return _______________;
                }
                else{	// delete the name and tel
			// ...
	

                        return _____;
                }
        }

}
void updateRecord(int total){

	// declare some variables ...

        cout << "Updating record..." << endl;
	// get the name to update
	// ...



	// search the name
	// ...


        if(__________________){
                cout << "Name Not Found" << endl;
        }
        else{
		// print old tel
		// input new tel
		// update tel
		// ...
        }
}

int getMenuChoice(){
        int choice;
	cout << "Telephone Enquiry System\n1) List Records\n2) Insert Record\n3) Delete Record\n4) Update Record\n5) Exit\n";

        do{
                cout << "Choice :";
                cin >> choice;
        }while(choice<0||choice>5);

        return choice;
}
int main(){

        int total, choice;
        total=readFile();

        do{
                choice=getMenuChoice();

                if(choice==1)
                        listRecord(total);
                else if(choice==2)
                        total=total+insertRecord(total);
                else if(choice==3)
                        total=total-deleteRecord(total);
                else if(choice==4)
                        updateRecord(total);
                else
                        writeFile(total);

        }while(choice!=5);

        return 0;

}