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How to convert from public class to struct?

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dejah0308

Programmer
Jul 3, 2022
1
MY
Hi, so i try to convert code that has public class to struct, so for the initial code it will be like this:

Code:
#include<iostream>
using namespace std;
#include<conio.h>
#include<string.h>
#include<process.h>
#include<stdio.h>
#include<fstream>
class car
{
	public:
	int vno;
	float count;
	char  dname[15],x,l[50];
	void input()
	{
		system("CLS");
			int d;
		cout<<"\n\n\t\tEnter the name of driver : ";
		cin>>dname;
		cout<<"\n\n\t\tEnter the car no : ";
		cin>>vno;
		cout<<"\n\n\t\tEnter the no of hours of stay : ";
		cin>>count;
		cout<<"\n\n\t\tEnter the time slot : ";
		cin>>l;
		if(d<20&&count<8)
   			{
   				cout<<"\n\n\t\tParking Available! You can park your car. ";
   			}
   			else
   				cout<<"\n\n\t\t Parking not possible!!";
   			cout<<"\n\n\t\tCar got parked!!";
		
	}
	void cal()
	{
			
		cout<<"\n\t\n\tAre you a V.I.P: y/n ";
		cin>>x;
		if(x=='y')
	{
		system("CLS");
		cout<<"\n\t\n\tThe total expense during parking  ";
		cout<<count*20<<" rupees";
	}
	else 
	{
		system("CLS");
		cout<<"\n\t\n\tThe total expenses during parking  ";
		cout<<count*25<<" rupees";
		
	}
}	
	void output()
	{
		cout<<"\n\n\t\tThe Driver Name : "<<dname<<endl;
		cout<<"\n\n\t\tThe Car No : "<<vno<<endl;
		cout<<"\n\n\t\tThe Hours Of Stay : " <<count;
		cout<<"\n\n\t\tThe Time Slot Of Parking : " <<l;
	
	}
	

		
}a,a1;
//brought to you by code-projects.org
void delete_record()
{
	int n;
	system("CLS");
	cout<<"\n\n\t\tEnter the car no you want to get depart : ";
	cin>>n;
	ifstream inFile;
    inFile.open("parking3.dat", ios::binary);
	ofstream outFile;
    outFile.open("temp.dat", ios::out | ios::binary);
    while(inFile.read((char*)&a, sizeof(a)))
    {
        if(a.vno!= n)
        {	
        	
            outFile.write((char*)&a, sizeof(a));
        }
         
    }
    cout<<"\n\n\t\t Parking Record Deleted";

    inFile.close();
    outFile.close();
    
    remove("parking3.dat");
    rename("temp.dat", "parking3.dat");
}

int main()
{
	int login();
    login();
	int choice,vno1,d;
	while(1) {
	system("CLS");

     cout << "\n\n\t\t ====== CAR PARKING RESERVATION SYSTEM ======";
     cout <<"\n\n                                          ";
     cout<<" \n\t\t\t======================";
     cout << "\n\n\t\t\t  1. Arrival of a Car";
     cout << "\n\n\t\t\t  2. Total no of cars Arrived";
     cout << "\n\n\t\t\t  3. Total parking charges of all cars with details";
     cout << "\n\n\t\t\t  4. Departure of the car";
     cout << "\n\n\t\t\t  5. Exit Program";
     cout<<" \n\t\t\t======================";
     cout << "\n\n";
     cout << "\t\t\t Select Your Choice ::";
     cin>>choice;
     switch(choice)
     {
      case 1 :
        {		
        		char f;
        		cout<<"\n\n\t\t==Do You Want to continue==y/n ";
        		cin>>f;
        		if(f=='y')
        		{
        		
				ofstream f1("parking3.dat",ios::binary|ios::out|ios::app);
                a.input();
                f1.write((char*)&a,sizeof(a));
        }
            	break;
        }
       case 2 :
           {
           	system("CLS");
  		   cout << "\n\n\t\t=== View the Records in the Parking Database ===";
           cout << "\n";
           ifstream infile("parking3.dat",ios::binary|ios::in);
           int d=1;
           while (infile.read((char *)&a,sizeof (a)))
		   {
		system("CLS");
           cout << "\n";
           cout<<"\n\n\tThe Car position in parking lot : "<<d;
           d++;
           a.output();
           cout<<"\n";
           cout<<"\n\n\n";
           system("PAUSE");
           cout<<endl;
       	   }
       
           break;
       	   }
       	case 4:	
		   {
		   
		   delete_record();
		   break;
	}
    	case 3:
		{
				ifstream infile("parking3.dat",ios::binary|ios::in);
           while (infile.read((char *)&a,sizeof (a)))
		   {
             cout << "\n";
			 a.cal();
			 a.output();
			 cout<<"\n";
			 cout<<endl;
			 
       		}
       		break;
   }
   		
   		case 5: 
		   {
		   	system("CLS");
		   	cout<<"\n\n\n\t\t\tBrought To You By: code-projects.org \n";
		   exit(0);
   			break;
   		}
   		default : 
		   {
		   cout<<"\n\n\t\t Invalid input";
			cout<<"\n\n\t\tPress Enter to continue";
			 
   	
   	}
   }
getch();
}}
//cpo
int login(){
   string pass ="";
   char ch;
   cout <<"\n\n\n\n\n\n\n\t\t\t\t\tCar Parking Reservation System Login";
   cout << "\n\n\n\n\n\n\n\t\t\t\t\t\tEnter Password: ";
   ch = _getch();
   while(ch != 13){//character 13 is enter
      pass.push_back(ch);
      cout << '*';
      ch = _getch();
   }
   if(pass == "pass"){
      cout << "\n\n\n\n\t\t\t\t\t  Access Granted! Welcome To Our System \n\n";
      system("PAUSE");
      
   }else{
      cout << "\n\n\n\n\t\t\t\t\tAccess Aborted...Please Try Again!!\n";
      system("PAUSE");
      system("CLS");
      login();
   }
}

however, I try to convert to struct directly but the choice 2,3 and 4 doesn't work :(
Code:
//password admin system: pass
#include<iostream>
using namespace std;
#include<conio.h>
#include<string.h>
#include<process.h>
#include<stdio.h>
#include<fstream>
#include<cstdlib>
#include<process.h>
class car
{
	public: //public member function can access any private, protected and public member of it's class//
	int VehicleNo;
	float Hours;
	char  DriverName[30],Time[50],VIP;
	void input() //fetch data needed from the user
	{
		system("cls"); //to clear the screen
		int i;
		cout<<"\n\n\t\tEnter the name of driver : ";
		cin>>DriverName;
		cout<<"\n\n\t\tEnter the car no : ";
		cin>>VehicleNo;
		cout<<"\n\n\t\tEnter the no of hours of stay : ";
		cin>>Hours;
		if(i<20 && Hours<8)
   	     {
   		     cout<<"\n\n\t\tParking slot available. You can park your car.";
   		 }
   		else
   			cout<<"\n\n\t\t Sorry, parking slot not available for your car.";
   			
		
	}
 
 void cal() //function to calculate parking fees
	{
			
		cout<<"\n\t\n\tAre you registered as a V.I.P?: y/n ";
		cin>>VIP;
		if(VIP=='y')
	  {
		system("cls");
		cout<<"\n\t\n\t[VIP] The total of parking fees: ";
		cout<<Hours*20<<" ringgit"; //calculate payment for vip member
	  }
	else 
	  {
		system("cls");
		cout<<"\n\t\n\t[NON-VIP] The total of parking fees: ";
		cout<<Hours*25<<" ringgit"; //calculate payment for non-vip member
		
	  }
    }	
	void output() //details statement to the user
	{
		cout<<"\n\n\t\tThe Driver Name : "<<DriverName<<endl;
		cout<<"\n\n\t\tThe Car No : "<<VehicleNo<<endl;
		cout<<"\n\n\t\tThe Hours Of Stay : " <<Hours;
	}
			
}

a,a1;
void delete_record() //function to delete record after user depart
{
	int depart;
	system("cls");
	cout<<"\n\n\t\tEnter the car no you want to get depart : ";
	cin>>depart;
	ifstream inFile; //read from the file
    inFile.open("parking3.dat", ios::binary); //makes sure the data is read/written without translating new line characters//
	ofstream outFile; //write to the file
    outFile.open("temp.dat", ios::out | ios::binary);  
    while(inFile.read((char*)&a, sizeof(a)))
    {
        if(a.VehicleNo!= depart)
        {	
        	
            outFile.write((char*)&a, sizeof(a));
        }
         
    }
    cout<<"\n\n\t\t Deleting your parking record...Successful.";

    inFile.close(); //close the file
    outFile.close();
    
    remove("parking3.dat"); //remove old data file
    rename("temp.dat", "parking3.dat"); //rename new data file
}

int main() // main function for the menu 
{
	int login();
    login(); // using login function
	int choice,VehicleNo1,i;
	while(1) 
	{
	 system("cls"); //clear the screen
	     //printing menu page statement
	     cout << "\n\n\t\t ====== CAR PARKING RESERVATION SYSTEM ======";
	     cout <<"\n\n                                          ";
	     cout<<" \n\t\t\t======================";
	     cout << "\n\n\t\t\t  1. Arrival of a Car"; //input new data from new car
	     cout << "\n\n\t\t\t  2. Total no of cars Arrived"; //view total cars arrived
	     cout << "\n\n\t\t\t  3. Total parking charges of all cars with details"; //view payment data for all car
	     cout << "\n\n\t\t\t  4. Departure of the car"; //input car departure
	     cout << "\n\n\t\t\t  5. Exit Program"; //exit the program
	     cout<<" \n\t\t\t======================";
	     cout << "\n\n";
	     cout << "\t\t\t Select Your Choice ::"; //admin input choice either 1,2,3,4 or 5
	     cin>>choice;
     switch(choice) //using switch structure
     {
      case 1 : //choice 1: car arrival
        {		
		    char f;
		    cout<<"\n\n\t\t==Do You Want to continue==Yes(y)/No(n) ";
		    cin>>f;
		    if(f=='y')
		    {
		        ofstream f1("parking3.dat",ios::binary|ios::out|ios::app);
			    a.input();
			    f1.write((char*)&a,sizeof(a));
		    }
		    break;
        }
       
	   case 2 : //choice 2: viewing total car arrived
        {
           system("cls");
  		   cout << "\n\n\t\t== Viewing Record in the Parking Database ==";
           cout << "\n";
           ifstream infile("parking3.dat",ios::binary|ios::in); //reading data from the file
           int i=1;
           while (infile.read((char *)&a,sizeof (a)))
		   {
			   system("cls");
	           cout << "\n";
	           cout<<"\n\n\tThe Car position in parking lot : "<<i; //determine car position in the parking
	           i++; 
	           a.output();
	           cout<<"\n";
	           cout<<"\n\n\n";
	           system("PAUSE");
	           cout<<endl;
       	   }
       
           break;
       	}	
	   
	   case 3: //choice 3: details of parking charges of all cars
		{
		   ifstream infile("parking3.dat",ios::binary|ios::in); //reading from the file
           while (infile.read((char *)&a,sizeof (a)))
		   {
             cout << "\n";
			 a.cal(); //function call, which for calculating the payment
			 a.output();
			 cout<<"\n";
			 cout<<endl;	 
       	   }
       		break;
       	
    
        }
   		
		case 4:	//choice 4: car departure
		{
			delete_record(); //function call to delete the record of car departing
			break;
	    }
	    
	    case 5: //exit the program
		{
		   	system("CLS");
		   	exit(0);
   			break;
   	    }
		   
		default : //default option if admin choose option other than 1,2,3,4 or 5
	    {
		   cout<<"\n\n\t\t Invalid input";
		   cout<<"\n\n\t\tPress Enter to continue";
	    }
   	
   	 }
     getch();
     
     
	}
}

//function admin login menu 
int login()
{
   string pass ="";
   char ch;
   cout <<"\n\n\n\n\n\n\n\t\t\t\t\tCar Parking Reservation System Login";
   cout << "\n\n\n\n\n\n\n\t\t\t\t\t\tEnter Password: "; // admin enter the password: pass
   ch = _getch();
      
	while(ch != 13) //character 13 is enter
	   { 
	      pass.push_back(ch);
	      cout << '*'; //password entered will be in **** form
	      ch = _getch();
	   }
	   
	if(pass == "pass") //the password entered match
	   { 
	      cout << "\n\n\n\n\t\t\t\t\tAccess Granted! Welcome To The System \n\n";
	      system("PAUSE");
	      
	   }
	   
	else  //the password entered not match
	  { 
	      cout << "\n\n\n\n\t\t\t\t\tAccess Aborted. Please Try Again\n";
	      system("PAUSE");
	      system("cls");
	      login();
	  }
}

how to make it work, please help me :(
 
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