My new programm......having problems.

This is a discussion on My new programm......having problems. within the C++ Programming forums, part of the General Programming Boards category; So I started this new program and I can't seem to get past the first step. Code: #include <iostream> using ...

  1. #1
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    Exclamation My new programm......having problems.

    So I started this new program and I can't seem to get past the first step.

    Code:
     
    #include <iostream>
    using namespace std;
    
    int main()
    {
    char Menu, Start, Recall, Exit,choice;
    
    cout <<"Hello, how are we today?" <<endl;
    cout <<"|===================|" <<endl;
    cout <<"|       (M)enu                          |" <<endl;
    cout <<"|       (S)tart                           |" <<endl;
    cout <<"|       (R)ecall                          |" <<endl;
    cout <<"|       (E)xit                             |" <<endl;
    cout <<"|______________________|" <<endl;
    cout <<"Please choose a destination" <<endl;
    cin >>choice;
       if (choice == Menu)
       {
           cout <<"You are in menu now!" <<endl;
       }
    system("pause");
    return 0;
    }
    The menu choice option won't work. Any ideas?
    Knowledge is power and I want it all

    -0RealityFusion0-

  2. #2
    Registered User
    Join Date
    Jul 2003
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    28
    I think it's the if statement. It should be

    if(choice == 'M')
    cout << "You are in menu now!" << endl;

  3. #3
    Registered User
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    Posts
    12

    Re: My new programm......having problems.

    Originally posted by RealityFusion
    So I started this new program and I can't seem to get past the first step.

    Code:
     
    #include <iostream>
    using namespace std;
    
    int main()
    {
    char Menu, Start, Recall, Exit,choice;
    
    const char Menu = 'M';
    const char Start = 'S';
    const char Recall = 'R';
    const char Exit = 'E';
    char choice;
     
    cout <<"Hello, how are we today?" <<endl;
    cout <<"|===================|" <<endl;
    cout <<"|       (M)enu                          |" <<endl;
    cout <<"|       (S)tart                           |" <<endl;
    cout <<"|       (R)ecall                          |" <<endl;
    cout <<"|       (E)xit                             |" <<endl;
    cout <<"|______________________|" <<endl;
    cout <<"Please choose a destination" <<endl;
    cin >>choice;
       if (choice == Menu)
       {
           cout <<"You are in menu now!" <<endl;
       }
    system("pause");
    return 0;
    }
    The menu choice option won't work. Any ideas?
    If you make a comparison (choice == Menu) you have to have declared both variables before. In your program you declared choice when typing it in, but you never declared what Menu is.
    I added const in front of the variables, since I'm guessing that they won't be changed...

  4. #4
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    I changed the code a bit and it still won't work.

    Code:
    #include <iostream>
    using namespace std;
    
    int main()
    {
     char m,s,r,e,choice;
     
    
    cout <<"Hello, how are we today?" <<endl;
    cout <<"|======================|" <<endl;
    cout <<"|       (M)enu         |" <<endl;
    cout <<"|       (S)tart        |" <<endl;
    cout <<"|       (R)ecall       |" <<endl;
    cout <<"|       (E)xit         |" <<endl;
    cout <<"|______________________|" <<endl;
    cout <<"Please choose a destination" <<endl;
    cin >>choice;
       if (choice == m)
       {
           cout <<"You are in menu now!" <<endl;
       }
    system("pause");
    return 0;
    }
    Knowledge is power and I want it all

    -0RealityFusion0-

  5. #5
    Cheesy Poofs! PJYelton's Avatar
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    Location
    Boulder
    Posts
    1,728
    Change this:
    Code:
    if (choice == m)
    {
        cout <<"You are in menu now!" <<endl;
    }
    to:
    Code:
    if (choice == 'm')
    {
        cout <<"You are in menu now!" <<endl;
    }
    Without the apostrophe's, you are comparing it to a variable, not a value. The VARIABLE m doesn't equal anything unless you initialize it.

  6. #6
    carry on JaWiB's Avatar
    Join Date
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    Location
    Seattle, WA
    Posts
    1,972
    Your checking to see if the user's input is equal to an uninitialized variable. You have to assign some kind of value to your chars:
    Code:
    char m='m'; //one way to do it
    const char s='s'; //this way the value assigned to the variable cant change
    or if you want you can:
    Code:
    #define m 'm'
    at the top of your program.

    or even simpler (but without variables)

    Code:
    if (choice=='m') //but remember if the user inputs 'M' this wont work since it is case sensitive ('m' is a different character)
    "Think not but that I know these things; or think
    I know them not: not therefore am I short
    Of knowing what I ought."
    -John Milton, Paradise Regained (1671)

    "Work hard and it might happen."
    -XSquared

  7. #7
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    Join Date
    Aug 2003
    Posts
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    Thanks, that fixed the problem!
    So the single aposthropy's (sp?) initialize things. I was kind of thinging that. Since M was declared as a char as well as choice it wouldn't output my if statement because choice and m are not the same value. It makes sense. Thank you.
    Knowledge is power and I want it all

    -0RealityFusion0-

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