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2 dimentional array-airplane seating

yingkang (16)
After user choose ticket type(first class, business, or economy) and desired seat, for example row 2 A, the program will output the form:
A B C D E F
row 1 * * * * * *
row 2 X * * * * * // now user chooses row 2 A
... * * * * * *
row 13 * * * * * *

* indicates the seat is available, X indicates the seat is occupied.
my problem is after the program works the first time, then the user wants to do it again( which I use a while loop) , for example , choose row 1 B, the form will show X at row 1 B, but not the row 2 A ( which the first time the user chose) any more.

A B C D E F
row 1 * X * * * *//user this time chooses row 1 B
row 2 * * * * * *//row 2 A that user has chosen isn't showing now
... * * * * * *
row 13 * * * * * *

Can anyone give me some suggestion to fix the problem? Thank you very much.

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#include<iostream>
#include<cctype>
#include<iomanip>

using namespace std;

void getData(char& ticketType, int& row, 
             char& column);
void printForm(char form[][6], int row, char column);

int main()
{
    char ch, ticketType, column;
    int row;
    char form[13][6];
    
    cout << "This program assigns seats for a plane.\n"
         << "Do you want to start now? Y/y for yes, N/n for no." << endl;
    cin >> ch;
    
    ch = static_cast<char>(toupper(ch));
    while(ch == 'Y')     
    { 
   
        getData(ticketType, row, column);
        printForm(form, row, column);
    
        cout << "This program assigns seats for a plane.\n"
             << "Do you want to start now? Y/y for yes, N/n for no." << endl;
        cin >> ch;
        ch = static_cast<char>(toupper(ch));
        if(ch == 'N')
          return 0;     
    }// end while   
    system("PAUSE");
    return 0;
}

void getData(char& ticketType, int& row, char& column)
{   
                             
    cout << "The airplane has 13 rows, with  six seats in each row. " << endl;
           
    cout << "Enter ticket type,\n"
         << "F for first class, \n"
         << "B for business class,\n"
         << "E for economy class:" << endl;
    cin >> ticketType;
    ticketType = static_cast<char>(toupper(ticketType));
    while(ticketType != 'F' && ticketType != 'B' && ticketType != 'E')
    {
        cout << "Invalid ticket type." << endl;
        cout << "Enter ticket type,\n"
             << "F/f for first class, \n"
             << "B/b for business class,\n"
             << "E/e for economy class:" << endl;
        cin >> ticketType;
        ticketType = static_cast<char>(toupper(ticketType));
     }      
    switch(ticketType)
    {
           case 'F':
                cout <<  "Row 1 and 2 are first class,\n" ;
                break;
           case 'B':
                cout <<  "row 3 throuh 7 are business class,\n";
                break;
           case 'E':
                cout <<  "row 8 through 13 are economy class." << endl; 
                break;
    }// end switch
                
    cout << "Enter the row number you want to sit: " << endl ;
    cin >> row;  
    
    cout << "Enter the seat number (from A to F). " << endl;
    cin >> column;
    column = static_cast<char>(toupper(column));  
}    

void printForm(char form[][6], int row, char column)
{
    int i, j;
    
    cout << "* indicates that the seat is available; " << endl; 
    cout << "X indicates that the seat is occupied. " << endl;
    cout << setw(12) << "A" << setw(6) << "B" << setw(6) << "C" 
         << setw(6) << "D" << setw(6) << "E" << setw(6) << "F" << endl;
         
    for(i = 0; i < 13; i++)
    {
       cout << left << setw(3) << "Row " << setw(2)<< i+1 ;
       for(j = 0; j < 6; j++)
       {
           if(i == row - 1 && j == static_cast<int>(column)-65)
              cout << right  << setw(6) << "X";
           else      
              cout << right <<  setw(6) << "*";
             
       }
       cout << endl;  
    }              
}


Gumbercules (209)
first you need to fill the row away with '*'s, then you need to adjust printForm to put an "X" in the corresponding row and column of form, and then print each character in row. It should look more like this
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#include<iostream>
#include<cctype>
#include<iomanip>

using namespace std;

void getData(char& ticketType, int& row, 
             char& column);
void printForm(char form[][6], int row, char column);

int main()
{
    char ch, ticketType, column;
    int row;
    char form[13][6];

        // fill forums with *'s
	for (int i = 0; i < 13; ++i)
		for (int j = 0; j < 6; ++j)
			form[i][j] = '*';
    
    cout << "This program assigns seats for a plane.\n"
         << "Do you want to start now? Y/y for yes, N/n for no." << endl;
    cin >> ch;
    
    ch = static_cast<char>(toupper(ch));
    while(ch == 'Y')     
    { 
   
        getData(ticketType, row, column);
        printForm(form, row, column);
    
        cout << "This program assigns seats for a plane.\n"
             << "Do you want to start now? Y/y for yes, N/n for no." << endl;
        cin >> ch;
        ch = static_cast<char>(toupper(ch));
        if(ch == 'N')
          return 0;     
    }// end while   
    system("PAUSE");
    return 0;
}

void getData(char& ticketType, int& row, char& column)
{   
                             
    cout << "The airplane has 13 rows, with  six seats in each row. " << endl;
           
    cout << "Enter ticket type,\n"
         << "F for first class, \n"
         << "B for business class,\n"
         << "E for economy class:" << endl;
    cin >> ticketType;
    ticketType = static_cast<char>(toupper(ticketType));
    while(ticketType != 'F' && ticketType != 'B' && ticketType != 'E')
    {
        cout << "Invalid ticket type." << endl;
        cout << "Enter ticket type,\n"
             << "F/f for first class, \n"
             << "B/b for business class,\n"
             << "E/e for economy class:" << endl;
        cin >> ticketType;
        ticketType = static_cast<char>(toupper(ticketType));
     }      
    switch(ticketType)
    {
           case 'F':
                cout <<  "Row 1 and 2 are first class,\n" ;
                break;
           case 'B':
                cout <<  "row 3 throuh 7 are business class,\n";
                break;
           case 'E':
                cout <<  "row 8 through 13 are economy class." << endl; 
                break;
    }// end switch
                
    cout << "Enter the row number you want to sit: " << endl ;
    cin >> row;  
    
    cout << "Enter the seat number (from A to F). " << endl;
    cin >> column;
    column = static_cast<char>(toupper(column));  
}    

void printForm(char form[][6], int row, char column)
{
    int i, j;
    
    cout << "* indicates that the seat is available; " << endl; 
    cout << "X indicates that the seat is occupied. " << endl;
    cout << setw(12) << "A" << setw(6) << "B" << setw(6) << "C" 
         << setw(6) << "D" << setw(6) << "E" << setw(6) << "F" << endl;
        
        // update form
	form[row - 1][column - 65] = 'X';
     
    // print form    
    for(i = 0; i < 13; i++)
    {
       cout << left << setw(3) << "Row " << setw(2)<< i+1 ;
       for(j = 0; j < 6; j++)
       {
           cout << right  << setw(6) << form[i][j];   
       }
       cout << endl;  
    }              
}
kempofighter (1183)
The problem is fairly simple. I do not see any attempt to remember previous entries. Where are you updating the form array to store the '*' or 'X' character? It seems to be working fine for me. It is doing exactly what it was programmed to do which is to print a seat map based on the last selection. Do you want the program to remember every seat selection? Then you have to update the form array after each successful entry by the user.
yingkang (16)
Thank you Gumbercules. I have changed my program according to your suggestion and it works fine now. Thanks to kempofighter too for your reply.
Here is my updated program which works fine now. I hope it's helpful to others.
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#include<iostream>
#include<cctype>
#include<iomanip>

using namespace std;

void initialize( char form[][6]);
void getData(char& ticketType, int& row, 
             char& column);
void printForm(char form[][6], int row, char column);

int main()
{
    char ch, ticketType, column;
    int row;
    char form[13][6];
    
    initialize( form) ;
    cout << "This program assigns seats for a plane.\n"
         << "Do you want to start now? Y/y for yes, N/n for no." << endl;
    cin >> ch;
    
    ch = static_cast<char>(toupper(ch));
    while(ch == 'Y')     
    { 

        getData(ticketType, row, column);
        printForm(form, row, column);
        
        cout << "This program assigns seats for a plane.\n"
             << "Do you want to start now? Y/y for yes, N/n for no." << endl;
        cin >> ch;
        ch = static_cast<char>(toupper(ch));
        if(ch == 'N')
          return 0;     
    }// end while   

    system("PAUSE");
    return 0;
}

void initialize( char form[][6])
{
     for(int i=0 ;i < 13 ;i++)
       for(int j=0 ;j<6 ;j++)
         form[i][j]='*';
}



void getData(char& ticketType, int& row, char& column)
{          
    cout << "The airplane has 13 rows, with  six seats in each row. " << endl;
           
    cout << "Enter ticket type,\n"
         << "F for first class, \n"
         << "B for business class,\n"
         << "E for economy class:" << endl;
    cin >> ticketType;
    ticketType = static_cast<char>(toupper(ticketType));
    while(ticketType != 'F' && ticketType != 'B' 
          && ticketType && ticketType != 'E')
    {
        cout << "Invalid ticket type." << endl;
        cout << "Enter ticket type,\n"
             << "F for first class, \n"
             << "B for business class,\n"
             << "E for economy class:" << endl;
        cin >> ticketType;
        ticketType = static_cast<char>(toupper(ticketType));
     }      
    switch(ticketType)
    {
           case 'F':
                cout <<  "Row 1 and 2 are first class,\n" ;
                break;
           case 'B':
                cout <<  "row 3 throuh 7 are business class,\n";
                break;
           case 'E':
                cout <<  "row 8 through 13 are economy class." << endl; 
                break;
    }// end switch
                
    cout << "Enter the row number you want to sit: " << endl ;
    cin >> row;  
    
    cout << "Enter the seat number (from A to F). " << endl;
    cin >> column;
    column = static_cast<char>(toupper(column));  
    
}    

void printForm(char form[][6], int row, char column)
{
    int i, j;
  
    if(form[row-1][static_cast<int>(column-65)]=='X')
   {
       cout << "This seat already assigned. Choose another seat: " << endl;
       cin >> column;
       column = static_cast<char>(toupper(column));  
   }  
    form[ row-1 ] [static_cast<int>(column)-65]= 'X';
    
    cout << "* indicates that the seat is available; " << endl; 
    cout << "X indicates that the seat is occupied. " << endl;
    cout << setw(12) << "A" << setw(6) << "B" << setw(6) << "C" 
         << setw(6) << "D" << setw(6) << "E" << setw(6) << "F" << endl;
         
    for(i = 0; i < 13; i++)
    {
       cout << left << setw(3) << "Row " << setw(2)<< i+1 ;
       for(j = 0; j < 6; j++)
       {
          cout << right  << setw(6) << form [i][j];
       }
       cout << endl;
    }

}
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