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I Need Help with Cases in C++.

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I Need Help with Cases in C++.

 
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  #1
Oct 27th, 2008
I am gonna start off saying that I am new to C++, and I have little programming knowledge (just Q Basic, and it has been a while since I have used that), and I need help on an assignment in my C++ class.

We have to use a case function to collect information for an order and display the total, but I have no clue how to get the case to work at all. I am sure the solution is simple, but as I have said I really do not know much about what I am doing.

And... here is the code:

C++ Syntax (Toggle Plain Text) 
  1. double S=2.50;
  2. double C=1.00;
  3. double B=2.00;
  4. double R=1.00;
  5. double L=1.50;
  6. double &T;
  7.  
  8. int menu();
  9. int choices();
  10. int main()
  11. {
  12.     menu();
  13.     choices();
  14.     system ("pause");
  15.     return 0;
  16.  
  17. }
  18. int choices()
  19. {
  20.     for (n=1, n++)
  21.         {
  22.          do
  23.            {
  24.               case 'S'
  25.               case 's':
  26.                    T=T+S;
  27.                    break;
  28.               case 'C'
  29.               case 'c':
  30.                    T=T+C;
  31.               case 'B'
  32.               case 'b':
  33.                    T=T+B;
  34.                    break;
  35.               case 'R'
  36.               case 'r':
  37.                    T=T+R;
  38.                    break;
  39.               case 'L'
  40.               case 'l':
  41.                    T=T+L;
  42.                    break;
  43.               case 'X'
  44.               case 'x'
  45.                    T=0;
  46.                    cout << "The Order Has Been Canceled. \n"
  47.                    break;
  48.            }                                 
  49.          }
  50. }

I already have the int menu() function working fine, it is the case stuff I am struggling with.
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Re: I Need Help with Cases in C++.

 
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  #2
Oct 27th, 2008
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Originally Posted by NinjaDude007 View Post
I am gonna start off saying that I am new to C++, and I have little programming knowledge (just Q Basic, and it has been a while since I have used that), and I need help on an assignment in my C++ class.

We have to use a case function to collect information for an order and display the total, but I have no clue how to get the case to work at all. I am sure the solution is simple, but as I have said I really do not know much about what I am doing.

And... here is the code:

C++ Syntax (Toggle Plain Text) 
  1. double S=2.50;
  2. double C=1.00;
  3. double B=2.00;
  4. double R=1.00;
  5. double L=1.50;
  6. double &T;
  7.  
  8. int menu();
  9. int choices();
  10. int main()
  11. {
  12.     menu();
  13.     choices();
  14.     system ("pause");
  15.     return 0;
  16.  
  17. }
  18. int choices()
  19. {
  20.     for (n=1, n++)
  21.         {
  22.          do
  23.            {
  24.               case 'S'
  25.               case 's':
  26.                    T=T+S;
  27.                    break;
  28.               case 'C'
  29.               case 'c':
  30.                    T=T+C;
  31.               case 'B'
  32.               case 'b':
  33.                    T=T+B;
  34.                    break;
  35.               case 'R'
  36.               case 'r':
  37.                    T=T+R;
  38.                    break;
  39.               case 'L'
  40.               case 'l':
  41.                    T=T+L;
  42.                    break;
  43.               case 'X'
  44.               case 'x'
  45.                    T=0;
  46.                    cout << "The Order Has Been Canceled. \n"
  47.                    break;
  48.            }                                 
  49.          }
  50. }

I already have the int menu() function working fine, it is the case stuff I am struggling with.
I don't understand your for loop (which is also syntactically erronous) , or the do loop. Just get rid of them for now, and implement them later if need be.

Hmm you are using the switch syntax wrong...try this:

C++ Syntax (Toggle Plain Text) 
  1. switch(tolower(choice))
  2. {              case 's':
  3.                    T=T+S;
  4.                    break;
  5.               case 'c':
  6.                    T=T+C;
  7.               case 'b':
  8.                    T=T+B;
  9.                    break;
  10.               case 'r':
  11.                    T=T+R;
  12.                    break;
  13.               case 'l':
  14.                    T=T+L;
  15.                    break;
  16.               case 'x'
  17.                    T=0;
  18.                    cout << "The Order Has Been Canceled. \n"
  19.                   break;
  20.               default:
  21.                    cout << "Invalid choice";
  22.                    break;
  23. }

Also, you should either be passing choice an argument, or have a cin input a char to use in the switch statement. Perhaps have menu() return a char, and pass it to choices for testing. Here's what I mean :

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. using std::cin;
  3. using std::cout;
  4. double S=2.50;
  5. double C=1.00;
  6. double B=2.00;
  7. double R=1.00;
  8. double L = 1.50;
  9. double T(0);
  10.  
  11. char Menu();
  12. void Choices(char);
  13. int main()
  14. {
  15.      Choices(Menu());
  16.      return 0;
  17. }
  18.  
  19. char Menu()
  20. {
  21.      char cChoice(0);
  22. 	 cout << "Menu:\n\nA)Do Something\nB)Do Something\nC)Quit\n\nChoice:";
  23.      do { 
  24.      cin.clear();
  25.      cin.ignore(cin.rdbuf()->in_avail());
  26.      cin >> cChoice;
  27. 	 } while (!cin.fail() && cin.rdbuf()->in_avail() > 1);
  28.     //just makes sure you didn't screw up the input buffer with some crappy input
  29.      return cChoice;
  30. }
  31.  
  32. void Choices(char choice)
  33. {
  34. switch(tolower(choice))
  35. {              case 's':
  36.                    T=T+S;
  37.                    break;
  38.               case 'c':
  39.                    T=T+C;
  40.               case 'b':
  41.                    T=T+B;
  42.                    break;
  43.               case 'r':
  44.                    T=T+R;
  45.                    break;
  46.               case 'l':
  47.                    T=T+L;
  48.                    break;
  49. 			  case 'x':
  50.                    T=0;
  51.                    cout << "The Order Has Been Canceled. \n";
  52.                   break;
  53.               default:
  54.                    cout << "Invalid choice";
  55.                     break;
  56.      }
  57. }

Don't expect this to compile; I didn't test it. But try and learn from it, as you had alot of syntax errors!
Last edited by skatamatic; Oct 27th, 2008 at 9:15 pm.
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NinjaDude007 NinjaDude007 is offline Offline
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Re: I Need Help with Cases in C++.

 
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  #3
Oct 28th, 2008
Thanks. I finally got it figured out and working right... somehow.
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