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C++ project on Doctor appointment

/*
Author: https://www.cppbuzz.com
Date: 20th Jan 2018
Compiled on: Dev C++/ g++
About: 
1. This project is used to book doctor appointment.
2. The record is maintend even if application is closed

For more projects please visit : https://www.cppbuzz.com
*/

#include <iostream>
#include <string>
#include <fstream>
#include <cstring>

using namespace std;

int bookAppointment()
{
    system("cls");
	
    cout<<"\n ----- Book Your Appointment ---- \n";	
    cout<<"\n ----- Availbale slots ---- \n";	 

    //check if record already exist..
    ifstream read;
    read.open("appointment.dat");
    
    int hoursbook = 8;
    
    int arr[13] = {0,0,0,0,0,0,0,0,0,0,0,0,0};
    int recordFound =0; 
     
    if(read)
    {     
	string line;
	char key = 'A';
	int i = 9;
	       
	while(getline(read, line)) {
		char temp = line[0];
		int index = (temp - 65);
		arr[index]=1;  
		recordFound = 1;
	}
	if(recordFound == 1)
	{
		cout<<"\n Appointment Summary by hours:";
		char key = 'A';
		int hours = 9;
		for(int i = 0; i<=12; i++)
		{
			if(i == 0){
			if(arr[i] == 0) 
			cout<<"\n "<<key<<"-> 0"<<hours<<" - Available";
			else
			cout<<"\n "<<key<<"-> 0"<<hours<<" - Booked";
			}
			
			else
			{								           	
			if(arr[i] == 0) 
			cout<<"\n "<<key<<"->"<<hours<<" - Available";
			else
			cout<<"\n "<<key<<"->"<<hours<<" - Booked";
			}
			hours++; key++;
		}
            
	}
		
	read.close();
    }
	if(recordFound == 0){
		cout<<"\n Appointment Available for following hours :";
		char key = 'A';
		for(int i = 9; i<=21; i++)
		{
			if(i==9)
			cout<<"\n "<<key<<" -> 0"<<i<<" - Available";
			else
			cout<<"\n "<<key<<" -> "<<i<<" - Available";
			key++;
		}
		
	}
   
   char choice;
   cout<<"\n\n Input your choice : ";
   cin>>choice;
   
   if( !(choice >= 'A' && choice <='Z'))
   {
   	cout<"\n Error : Invalid Selection";
   	cout<<"\n Please selction correct value from menu A- Z";
   	cout<"\n Press any key to continue";
   	getchar();getchar();
   	system("cls");
   	bookAppointment();
   	
   }
   
   int index = (choice-65 );
   int isBooked = 1;
   if(arr[index] == 0) 
      isBooked = 0;
      
   if(isBooked ==1)
   {
   	cout<<"\n Error : Appointment is already booked for this Hour";
   	cout<<"\n Please select different time !!";
   	cout<<"\n Press any key to continue!!";
   	getchar();getchar();
   	system("cls");
   	bookAppointment();
   }
   
   string name;
   cout<<"\n Enter your first name:";
   cin>>name;  
   
     
    ofstream out;
   out.open("appointment.dat", ios::app);
	
   if(out){
	   out<<choice<<":"<<name.c_str()<<"\n";
	   out.close();
	   cout<<"\n Appointment booked for Hours : "<< (choice-65) + 9 <<" successfully !!";
    }
    else
    {
    	cout<<"\n Error while saving booking";
    }

    cout<<"\n Please any key to continue..";
	getchar(); getchar();
	return 0;		
}

int existingAppointment()
{
    system("cls");
	
    cout<<"\n ----- Appointments Summary ---- \n";	
    
    //check if record already exist..
    ifstream read;
    read.open("appointment.dat");
    
    int hoursbook = 8;
    
    int arr[13] = {0,0,0,0,0,0,0,0,0,0,0,0,0};
     int recordFound =0; 
     
    if(read)
    {     
	string line;
	char key = 'A';
	int i = 9;
	       
	   while(getline(read, line)) {
	   	   char temp = line[0];
	   	   int index = (temp - 65);
	   	   arr[index]=1;  
		   recordFound = 1;
	  }
        if(recordFound == 1)
        {
            cout<<"\n Appointment Summary by hours:";
            char key = 'A';
            int hours = 9;
            for(int i = 0; i<=12; i++)
            {
            	if(arr[i] == 0) 
            	cout<<"\n "<<key<<"->"<<hours<<" - Available";
            	else
            	cout<<"\n "<<key<<"->"<<hours<<" - Booked";
            	hours++; key++;
	   }
            
	}
		
	read.close();
    }
    else
    {
    	char key = 'A';
		for(int i = 9; i<=21; i++)
		{
			if(i==9)
			cout<<"\n "<<key<<" -> 0"<<i<<" - Available";
			else
			cout<<"\n "<<key<<" -> "<<i<<" - Available";
			key++;
		}
    }
    
    cout<<"\n Please any key to continue..";
    getchar(); getchar();
    return 0;	 
}
int main(int argc, char** argv) {
	while(1)
	{
		system("cls");
		cout<<"\t\t\tDoctor Appointment System\n";
		cout<<"-------------------------------------------------------------------------\n\n";
		
		cout<<"1. Book Appointment\n";
		cout<<"2. Check Existing Appointment\n";
		cout<<"0. Exit\n";
		int choice;
		
		cout<<"\n Enter you choice: ";
		cin>>choice;
		
		switch(choice)
		{
			case 1: bookAppointment(); break;
			case 2: existingAppointment(); break;
			case 0: 
			        while(1)
			        {
					 system("cls");
			        	cout<<"\n Are you sure, you want to exit? y | n \n";
			        	char ex;
			        	cin>>ex;
			        	if(ex == 'y' || ex == 'Y')
			        		exit(0);
			        	else if(ex == 'n' || ex == 'N')
	                     		{
	                     		 break;
	                    		}
	                     else{
	                     	cout<<"\n Invalid choice !!!";
	                     	getchar();
	                     }
                 	 }	break;
                 	 
            default: cout<<"\n Invalid choice. Enter again ";
                     getchar();
                 	
		}   		        

	}
	return 0;
}