after i tried many times to solf this program i couldnt do it
this is the sorce of my program and it is about sell and rent a care.
my problem is when i run do progrm it works but when i try to see the car i want buy or rent cant . i created text file for rent and sell and it has all information about all cars and also i created anther file for member to save username and password.

2- i want to add a fuction for rent that multuple a days that user choose and the price of car???

plz help me and i will be thankfull to all

i hope you got it ???why it is not display cars ???it show me 0 0 0 for all cars??

#include <iostream>
#include <iomanip>
#include <cmath>
#include <string>
#include <fstream>

using namespace std;
 
 
struct member													// This structure is made for the member
{
	string member_name;											// Each member will have a member's name
	string member_pass;											// password and
	double balance;												// balance
};																// This will make things easier for organizing the data


struct item														// This structure is made for the items
{
	int id;														// Each item will have an id
	char name[100];												// name and
	double price;												// price
};																// This will make things easier for organizing the data 


//After making the structures then we initialize the needed variables as types of the structures 
item personal_cars[20];											// Initialize personal cars	variable						
item rent_cars[10];												// Initialize rent cars variable
item cart[10];													// Initialize cart variable
member members[20];												// Initialize members variable


//Initializing these global variables to 0 is necesary each time the program is run
int position=0;													// Position is a counter that will stop at the user that logs in
int size=0;														// Size will determine the position of the item, i.e if size is at 3 then there are 3 items in cart
int counter=0;													// Counter will count the total number of members
fstream log_member;												// Initializes file for both reading and writing
 

//These are the user defined functions
void intro();
void start();
void login();
void new_member();
void options();
void view_account();
void view_cart();
void add_to_cart(char);
void check_out();
void drop();
void order();
void logout();
void display_items(char);
void Add_to_balance();
void receipt(double total);
void update();



//*********************************************************************************************************************

//##############################              MAIN FUNCTION          ##################################################

int main()
{
	intro();
    start();
    options();
    
    system("PAUSE");    
    return 0;
}

//##############################              END MAIN              ###################################################

//*********************************************************************************************************************



//The start function Prints out the Welcome screen and gives the user his first choices in the program
//The choices chosen are other functions thenselves

void intro()
{
	cout <<endl;
	cout << "  ***************************************************************************" <<endl;
	cout << "  *                     <<<Welcome to SMW Company>>>                        *\n" <<endl;
	cout << "  *  This program takes your to buy a car that you are looking for          *" << endl;
	cout << "  *  and returns the answer to the screen. If an illegal operator is        *" << endl;
	cout << "  *  selected, an error message will be displayed. Be careful which         *" <<endl;
	cout << "  *  number you select because the program depends on you for input.        *" <<endl;
	cout << "  *  The only error check function it has, is for unacceptable opreators.   *" <<endl;
	cout << "  *  Acceptable operators are : (1 , 2 , 3 and 4). The character c sets     *" <<endl;
	cout << "  *  the value stored to ZERO. ENJOY YOUR PROGRAM !!!!!!                    *" <<endl;
	cout << "  ***************************************************************************" <<endl;
	cout <<endl;
}



void start()
{
	char choice;
     
	cout<<"\n\n1. New Account Sign Up\n2. Login\n"<<endl;
    cin >> choice;
	
	if(choice=='1')
		new_member();
	else if(choice=='2')
		login();
	else
	{
		cout<<"Invalid input"<<endl;
		start();
	}
}


//The new user function as implied in the name adds a new user to the record

void new_member()
{
     fstream log_member;										//Initializing file
     log_member.open ("members.txt");							// opening a file
     
     int i=0;													//Loop used to read all existing members into memory
     
	 
	 while(log_member>>members[i].member_name && log_member>>members[i].member_pass && log_member>>members[i].balance)
	 {
      i++;
     }
     
     //20 is the max number of members, so if i is >= 20 then that means there is no more space, but hopefully not :)
	 if(i<20)
     {
	  cout<<"Enter new Username (Max 12 Characters) : ";
      cin >> members[i].member_name;
     
      cout<<"Enter new Password (Max 10 Characters) : ";
      cin >> members[i].member_pass;
      
	  members[i].balance=0;										//Initializes new user balance to RM 0
	  position=i;
      counter=position;
      
      log_member.close();
	 }

	 else
	 {
		 cout<<"Maximum limit of members reached"<<endl;
	 }
     
     
}


//Login function logs in an existing member by reading the member name and password, 
//and then checking it with existing member names and passwords

void login()
{
	fstream log_member;											//Initilizing and opening a file
	char member_name[12],password[10];							//Initializing arrays to store member name and password
	position = -1;
	
	cout<<"Member's name : ";
	cin >> member_name;
	cout<<"Password      : ";
	cin >> password;
	
	log_member.open("members.txt");
	
	//This loops reads throuhg all existing member names and pasword sets,
	//and if any set mathces the one entered then it allocates to variable position
	//and then continues the loop till it reads all
	
	for (int i = 0; log_member>>members[i].member_name && log_member>>members[i].member_pass && log_member>>members[i].balance; i++)
	{
		if(members[i].member_name == member_name && members[i].member_pass == password)
		{
			position = i;
		}
		else
		{
			position = position;
		}
	}
	
	if(position>=0)												//This checks to see if the member has been found
	{
		log_member.close();
	}
	else														//This alerts the user that the details he/she entered were not found
	{
		cout<<"Incorrect username or password!"<<endl;			//cout<<"Position: "<< position <<endl;
		
		log_member.close();
		start();
	}
	
	log_member.close();
}


void options()													//Options functions comes after login and it gives the member his next options
{
	char option;
	
	cout<<"\n\nWelcome to your account "<<members[position].member_name<<endl;
	cout<<"\nChoose an option :"<<endl;
	cout<<"\n1. View Account Summary\n2. Order\n3. View Shopping Cart\n4. Logout\n"<<endl;
	cin >> option; 
	
    switch (option)												//Switch is used to select his chosen option 
	{
		case '1':
			view_account();
			break;
		case '2':
			order();
			break;
		case '3':
			view_cart();
			break;
		case '4':
			logout();
			break;
		default:
			cout<<"Invalid input"<<endl;
			options();
	}
}


//View account function gives the member some options to look into his/her account details like balance, Add_to_balance money and loging out

void view_account()
{
	char option;
	
	cout<<"\n1. Balance\n2. Add to my balance\n3. Return to Previous Menu\n4. Logout"<<endl;
	cin >> option;
	
	switch (option)
	{
		case '1':
			{
				cout<<"\nYour Available Balance is RM "<< members[position].balance <<endl;
				view_account();
			}
			break;
		case '2':
			{
				Add_to_balance();
			}
			break;
		case '3':
			{
				options();
			}
			break;
		case '4':
			{
				logout();
			}
			break;
		default:
			{
				view_account();
			}
	}
}


//Add_to_balance function adds money to the member existing balance
//We assume the member has a valid third party bank account
//So all that is need to be done is to specify the amount and add to
//his/her balance

void Add_to_balance()
{
	float Add_to_balancement=0;

	cout<<"The amount : ";
	cin>>Add_to_balancement;
	
	members[position].balance += Add_to_balancement;
	
	cout<<"The Add_to_balancement has been successful added :)"<<endl;
	cout<<members[position].member_name<<" current balance is RM "<< members[position].balance <<endl;
	
	view_account();
}


void order()
{
	//Gives member options to choose whic list to view
	
	char option, choice;
	cout<<"\nChoose which list you would like to view"<<endl;
	cout<<"\n1. Buy car\n2. Rent car\n3. Return to Previous Menu"<<endl;
	cin >> option;
	
	//The option chosen is passed to another function used to display the items
	
	display_items(option);
	
	cout<<"1.Add item to the order\n2.Retun to previous menu"<<endl;
	cin >> choice;
	
	if (choice == '1')
	{
		//Option chosen passed on to another function to add to cart
		add_to_cart(option);
	}
	else
	{
		//Directs to the view the list option
		order();
	}
	
	//After a member adds a item then he/she is immediately shown his/her cart
	view_cart();
}


//view_cart function shows the member his/her cart

void view_cart()
{
	char choice;
	cout<<"\n"<<members[position].member_name<<" item(s) :\n"<<endl;
	cout<<"**********************************************************************"<<endl;
	cout<<"ID"<<"\t\t"<<" Item Name"<<"\t\t\t"<<"Price"<<endl;
	cout<<"**********************************************************************"<<endl;
	
	
	for (int i = 0; i < size; i++)								//This loop prints out all items in cart
	{
		cout<<cart[i].id<<"\t\t"<<cart[i].name<<"\t\t"<<cart[i].price<<endl;
	}
	
	//More options avaliable since use may want to check out right away
	cout<<"\n1.Checkout Item(s)\n2.Drop item(s)\n3.Add item(s)\n4.Return to previous menu"<<endl;
	cin >> choice;

	switch (choice)
	{
		case '1':
			check_out();
			break;
		case '2':
			drop();
			break;
		case '3':
			order();
			break;
		case '4':
			options();
			break;
		default:
			cout<<"Invalid input"<<endl;
			view_cart();
	}
}


//Drop function drops last item added, since we are storing added items to cart in arrays
//we have only enough knowledge to drop the last one entered

void drop()
{
	//Since variable 'size' it what we use to store the number of elements in the cart array
	//all we need to to is rollback one step in order to remove the last item 
     size -= 1;
     cout<<"You last item has been dropped succesfully :)"<<endl;
     options();
}

//Display items function displays the items the member wants, 
//the function is passed a value which it acts on to show the required item 

void display_items(char option)
{
      switch (option)
     {
            case '1':
				{
					//Initializes file for reading n writing
					ifstream personal_cars_file ("personal cars.txt");
					
					for(int i=0; i<20; i++)						//loops through the whole file
					{
						//Stores the first value before a space in the line as 'id'
						personal_cars_file>>personal_cars[i].id;
						
						//Stores the next after the space as name until it reaches a tab
						personal_cars_file.get(personal_cars[i].name, 100 ,'\t');
						
						//Then stores the next as price
						personal_cars_file>>personal_cars[i].price;
						
						//It then prints out what it just read to the screen
						cout<<personal_cars[i].id<<"\t"<<personal_cars[i].name<<"\t"<<personal_cars[i].price<<endl;
					}
					personal_cars_file.close();					//Closes the file
				}
				break;
				
			//Same as above happens on the rest, exept it does it with different files
			case '2':
				{
					int days;

					cout<<"How many day(s) you want to rent the car?"<<endl;
					cin>>days;

					fstream rent_cars_file ("rent_cars.txt");
					
					for(int i=0; i<10; i++)
					{
						rent_cars_file>>rent_cars[i].id;
						rent_cars_file.get(rent_cars[i].name, 100 ,'\t');
						rent_cars_file>>rent_cars[i].price;
						cout<<rent_cars[i].id<<"\t"<<rent_cars[i].name<<"\t"<<(rent_cars[i].price)*days<<endl;
					}

					rent_cars_file.close();
				}
				break;
            
			case '3':
				options();
				break;
            
            default:
				{
					cout<<"\nInvalid Input"<<endl;
					order();
				}
	  }
}


void add_to_cart(char option)									//This function adds a selected item to the cart
{																//It is passed a value which determines which list the member is refereing to
	int id;

	//The if statement is a validity checker that check if the cart is full or not
	if (size < 10)
	{
		switch (option)
		{
			case '1':
				{
					cout<<"Enter the item ID: ";
					cin >> id;
					
					
					cart[size] = personal_cars[id-1];			//This maps the selected item to the cart
					size++;
					cout<<"Your item has been added to "<<members[position].member_name<<" cart successfully :)"<<endl;
				}
				break;
			case '2':
				{
					cout<<"Enter the item ID: ";
					cin >> id;
					
					cart[size] = rent_cars[id-1];
					size++;
					cout<<"Your item has been added to "<<members[position].member_name<<" cart successfully :)"<<endl;
				}
				break;
			default:
				cout<<"Invalid input"<<endl;
				order();
		}
	}
	
	//This means the cart is full so it alerts the member
	else
	{
		cout<<"Cart full"<<endl;
		order();
	}
}

//Checkout is like buying the item(s)
void check_out()
{
	char choice;
	double total = 0;
	
	
	for (int i = 0; i < size; i++)								//This loop sums the total of the item(s) added to the cart
	{
		total += cart[i].price;
	}
	
	if ( total > members[position].balance)						//This statement checks whether the member has enouhgh balance
	{
		cout<<"\n\nSorry you have insufficient funds to continue the transaction"<<endl;
		cout<<"\n\n1.Add_to_balance\n2.Drop last item\n3.Order\n4.Logout"<<endl;
		cin >> choice;
		
		switch (choice)
		{
			case '1':
				Add_to_balance();
				break;
			case '2':
				drop();
				break;
			case '3':
				order();
				break;
			case '4':
				logout();
				break;
			default:
				cout<<"Invalid input"<<endl;
				check_out();
		}
	}
	else
	{
		members[position].balance -= total;						//It deducts the total sum of the items from his/her balance

		cout<<members[position].member_name<<" cart have been checked out successfully :)"<<endl;
		
		cout<<"The remaining balance is   : "<< members[position].balance <<endl;
		
		receipt(total);
		update();
		size=0;
		counter=0;
		position=0;
		
		for (int i = 0; i < size; i++)
		{
			cart[i].id=('0');
		}
		main();
	}
     
}

//Update function writes all the edited information of the member back to the text file

void update()
{
	fstream log_member;
	log_member.open ("members.txt");
	
	//Loop used to get to the member info
	for (int i = 0; i <= position; i++)
	{
		log_member<< members[i].member_name <<" ";
		log_member<< members[i].member_pass <<" ";
		log_member<< members[i].balance <<" ";
	}
	log_member.close();
}

void receipt(double total)
{
	cout<<"\nPrinting "<<members[position].member_name<<" receipt.."<<endl;
	cout<<"***********************************************************************"<<endl;
	cout<<"\t\t\tSMW Company\n";
	cout<<"\t\t  TEL: +60173784877"<<endl;
	cout<<"\t\t    IIUM, Gombak"<<endl;
	cout<<"----------------------------------------------------------------------"<<endl;
	cout<<"ID"<<"\t\t"<<" Car Name"<<"\t\t\t"<<"Price"<<endl;
	cout<<"----------------------------------------------------------------------"<<endl;
	
	for (int i = 0; i < size; i++)
	{
		cout<<cart[i].id<<"\t\t"<<cart[i].name<<"\t\t"<<cart[i].price<<endl;
	}

	cout<<"***********************************************************************"<<endl;
	cout<<"Cart Total\t\t\t\t"<<total<<endl;
	cout<<"Tax 2%\t\t\t\t\t"<<(total*2)/100<<endl;
	
	cout<<"Total\t\t\t\t\t"<<(total)+((total*2)/100)<<endl;

	cout<<"\t\tTHANK YOU "<<members[position].member_name<<"\n\tIT WAS OUR PLEASURE SERVING YOU\n";
}

//Logout finally updates the member info and then exits the program
             
void logout()
{
	update();
	size=0;
	counter=0;
	position=0;
	
	for (int i = 0; i < size; i++)
	{
		cart[i].id=('0');
	}
	
	cout<<"\nYou have succesfully logged out\n\n\n\n"<<endl;
	main();
}

To build on what Sci@phy siad, narrow it down to a small section of code aswell. Don't expect us to read all of that when we may only need to look at 5 lines of it!

Chris

guys iam still new
alright dont warry next time i will follow the stractures

NOW are you going to help me or just add some Comments

guys iam still new
alright dont warry next time i will follow the stractures

NOW are you going to help me or just add some Comments

Next time is good but what about this time, If you take into consideration what we said then we can help you. Until then we are pretty much just taking radom stabs in the dark.

Chris

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