Menu Help

[smr0930]

So I need help with a menu for an airline program. (yes i am obviously a newbie :p) The problem I have is that i have to have a menu. one option is to enter an id. the second option is to enter a seat for that specific user ID. Im really confused here. I had a program but i cant use if statements.
ex.

if (choice ==1)
{
cout << "please enter an id"
cin >> user[num].id; 
}

because the struct is only available for that function.

how would you go about doing this?
i just need a push in a good direction.
im not looking for saving memory or anthing. this is for homework obviously.
i thought about using classes but im not too proficient with them yet.

i also have to output the id along with the seat to a file because an option is to read in a previous file with previous users and seats.

I'm sorry if this is too confusing. ill try to explain it more if i need to.

thanks in advanced for any help.

[ascii]

please post all your code because we wont be able to understand unless we see atleast the struct. are you getting compiler errors or runtime errors or what? also i personally recommend against using structs cause i find they lead to trouble more then they help ;)

[mobat]

Its a good idea to show us all of your code, if not this might help.

using namespace std;
#include <iostream>

int main()
{
    string choice;
    cout << "----Menu----\n";
    cout << "1. This\n";
    cout << "2. That\n";
    cout << "3. Who\n";
    while (choice != "done")
    {
        cout << "Your choice: ";
        cin >> choice;
        if (choice == "1")
        {
            //Do function
        }
        else if (choice == "2")
        {
            //Do
        }
        else if (choice == "3")
        {
            //do
        }
    }
}

or

using namespace std;
#include <iostream>

void menu();

int main()
{
    menu();
}

void menu()
{
    string choice;
    cout << "----Menu----\n";
    cout << "1. This\n";
    cout << "2. That\n";
    cout << "3. Who\n";
    while (choice != "done")
    {
        cout << "Your choice: ";
        cin >> choice;
        if (choice == "1")
        {
            //Do function
        }
        else if (choice == "2")
        {
            //Do
        }
        else if (choice == "3")
        {
            //do
        }
    }
}

[smr0930]

ok so here is what i have so far. I saw that you used else if's mobat.
would that be a lot better than just using if statements? would i be able to use cin's from one of those else if functions in another function?

im not getting any errors except for the fact that i cannot use an id to match the flight seat.
so when i enter a seat it erases from memory when i go back to the main menu. when i print out the seating chart the seat is now not occupied with the "X".

by the way here is my code.

/*CSC 160

This is a program where a user picks a customer ID and picks his or her seat on 
an airplane flight. It is menu driven and does a series of tasks regarding 
airline seating. */

#include <iostream>
#include <fstream>
#include <string>
using namespace std; 


//declare struct called user
struct user
{
       string pin; 
       string seat; 
      
       };
//declare mad amounts of struct users       
const int maxsize = 21; 
int main()
{  
    
   //declare file to read from and to save to
    ofstream outdata("manifest.dat");
    ifstream indata("manifest.dat"); 
   
   //declare two dimensional array of seats
    char seats[7][4] =
    
    {   {'1', 'A', 'B', 'C'},
        {'2', 'A', 'B', 'C'},
        {'3', 'A', 'B', 'C'},
        {'4', 'A', 'B', 'C'},
        {'5', 'A', 'B', 'C'},
        {'6', 'A', 'B', 'C'},
        {'7', 'A', 'B', 'C'}
        
        
      
        };      
       

        //declare ints and struct called users. 
    int row = 0; 
    int column = 0; 
    int choice; 
    int num = 1; 
    user you, users[maxsize]; 
    
  //clear screen when i return to main from choices. 
  
    system("cls"); 
    
    //menu of the airline program.
    cout <<"1. Enter Customer ID" << endl; 
    cout <<"2. Enter Requested Seat" <<endl; 
    cout <<"3. View Assigned Seats" <<endl; 
    cout <<"4. Print Manifest" <<endl; 
    cout <<"5. Save to File" <<endl; 
    cout <<"6. Read Saved file" <<endl; 
    cout <<"7. Exit" <<endl; 
    cout <<"Please enter a choice 1-7: " <<endl; 

    //choice from 1-7
    cin >> choice; 
    
    
    //choice number 1
    if (choice == 1)
    {
               //clear screen first
               system("cls"); 
               
               //enter id of 4 numbers 
     cout << "Please enter a customer id of 4 numbers: "<<endl; 
          cin >> users[num].pin; 
          //send pin number to the file
          outdata << users[num].pin;
          
          
          cout<< "Returning to main menu...."<<endl; 
          
          
          system ("pause");
          return main();
          }
          
          //for choice 2
          if (choice == 2)
          { 
                     
                     system("cls");
                  
                     
                   
                    // enter seat you wish to sit in
          cout << "Please enter the seat you want to be placed in, starting with"<<endl; 
          cout << "the row. (For example for seat 1 B, enter: 1 2)"<<endl; 
          cout <<"Enter choice now: "<<endl; 
          //out put row and column to file. 
          cin >> row>>column; 
          outdata << row << " " << column; 
          
          // printing out seating chart for varification
         row = row - 1; 
   
          seats[row][column] = 'X'; 
          
           for (int i = 0; i < 7; i++)
          {
               for (int j = 0; j < 4; j++)
               
             cout <<  " " << seats[i][j]<< " "; 
             cout <<endl; 
          
          
        
         } 
         //change user to the next one
          num++;     
          system("pause");
          return main(); 
          }
          //print out seats
    if (choice == 3)
    { 
               system ("cls"); 
       cout << "Seats taken are marked with an 'X'" <<endl; 
          for (int i = 0; i < 7; i++)
          {
               for (int j = 0; j < 4; j++)
               
             cout <<  " " << seats[i][j]<< " "; 
             cout <<endl; 
         }    
         cout << "Returning to main screen"<<endl; 
            system ("pause"); 
            return main(); 
     
     }
     /* print out manifest
     for ex. 
     
     Manifest for flight. 
     1111 1B
     2321 3C
     etc. */
     
    if (choice == 4)
    { 
               system("cls"); 
   
    cout << users[0].pin<<endl; 
               
               cout << "Manifest for Flight 13 - F" << endl; 
               for (int i =1; i < num; i++)
                  {
                        cout << users[i].pin<<endl; 
                             cout << " " << users[i].seat << endl; 
                             }
               cout << "returning to home screen.." << endl; 
               
               system("pause");
               
               return main();
               }
               
    if (choice == 5)\
    { //save to file
               outdata << users[num].pin<<" " <<users[num].seat<<endl; 
               }
    if (choice == 6) 
    {
               //read from file which i do not know how to do
               }
               
               //exit
    if (choice == 7)
    {
               return 0; 
               }
               
system("pause");
return 0;   
 
}

[cristi121]

You could make a function for each operation in the menu and then use a switch statement to implement the menu.

[smr0930]

Yea thats what i eventually had to do cristi. Thanks a lot you guys for your help. =]