First C++ program unsuccessful:(

This is a discussion on First C++ program unsuccessful:( within the C++ Programming forums, part of the General Programming Boards category; Hello everyone, Am writing my first C++ program and I've hit the first roadblock as well lol Heres the code: ...

  1. #1
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    First C++ program unsuccessful:(

    Hello everyone,

    Am writing my first C++ program and I've hit the first roadblock as well lol

    Heres the code:

    Code:
    #include <iostream>
    
    class student
    
    {
    
          public:
                 char studid[5] ;
                 char stuname[20] ;
                 int age ;
    
          void accept ()
    
          {
               cout << "Enter student ID" << endl ;
               cin >> studid >> endl ;
    
               cout << "Enter your name" << endl ;
               cin >> stuname >> endl ;
    
               cout << "Enter your age" << endl ;
               cin >> age >> endl ;
    
               }
    
          void display ()
    
          {
               cout << "The entered details are as follows:" << endl ;
               cout << "studid =" << studid << endl ;
    
               }
               };
    
    
          main ()
    
          {
              student stuobj ;
              stuobj.accept() ;
              stuobj.display() ;
    
              }
    When I compile and run it I get the following errors

    In member function 'void student::accept()':

    error : 'cout' undeclared (first use this function)

    error: 'endl' undeclared (first use this function)

    error : 'cin' undeclared (first use this function)

    In member function 'void student::display()':


    same errors like above.

    Please help

  2. #2
    Programming Wraith GReaper's Avatar
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    Add "using namespace std;" after the "#include <iostream>"

    Hey, don't worry. My first 10 attempts where pure failures!
    Devoted my life to programming...

  3. #3
    printf("Hello Cboard\n"); codeprada's Avatar
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    attempting classes with your first C++ program...impressive. try get and set functions instead of asking for user input within your class though

  4. #4
    The Dragon Reborn
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    just to let you know..there is a possibility of a buffer overflow, when using char array..
    you should try the string object...if the book hasn't covered, it is simple.
    #include <string> //include the string file

    string studid will be your variable..yep just like that.

    And yes..impressive.
    You ended that sentence with a preposition...Bastard!

  5. #5
    -bleh-
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    Impressive first attempt. You still need "int main()"
    "All that we see or seem
    Is but a dream within a dream." - Poe

  6. #6
    Third Eye Babkockdood's Avatar
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    Quote Originally Posted by nimitzhunter View Post
    Impressive first attempt. You still need "int main()"
    He already has a main function. It just doesn't return anything.

    OP, that's pretty lengthy for someone's first program. Try including the string header and using string variables instead of char arrays.

  7. #7
    -bleh-
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    Quote Originally Posted by Babkockdood View Post
    He already has a main function. It just doesn't return anything.
    what he had was not a function. Without returning anything, it has the same affect as implicitly returning 0. But that is still not a proper function. The only legal main() are:
    Code:
    int main()
    or
    int main( int argc, char* argv[] )
    Last edited by nimitzhunter; 02-10-2011 at 02:04 PM.
    "All that we see or seem
    Is but a dream within a dream." - Poe

  8. #8
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    Impressive?? I dont know my C++ course starts with classes and objects
    and that exact program works fine on gpp compiler but its giving errors
    on Dev C++ and Code::Blocks compiler

    My tutor told me there needs to be a path given in the compilers that am
    using or maybe my compiler installation is wrong!!! do you think she's
    right??

    Thanks for all the help guys, this forum is too good

  9. #9
    Registered User rogster001's Avatar
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    Well what errors do you now get? assuming that you have made the suggeted changes to your code?

    if you get errors like this:
    ...undeclared (first use this function)
    With library functions then it means you are not including the required header, or if you get similar errors at the linking phase then you have not set your linking to the required libraries correctly.

    In code blocks you need to set the path for includes, and the path for library linkage via the project options menus, you also need to check if you have listed the correct libraries to link to in the build options, this is usually only for third party libraries as the OS stuff is usually added with the project creation.
    Of course you need to check that the compilers actual location is properly set in the global 'compiler / debugger' options.
    Thought for the day:
    "Are you sure your sanity chip is fully screwed in sir?" (Kryten)
    FLTK: "The most fun you can have with your clothes on."

    Stroustrup:
    "If I had thought of it and had some marketing sense every computer and just about any gadget would have had a little 'C++ Inside' sticker on it'"

  10. #10
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    After adding "using namespace std ;" (excluding " ") below #include <iostream>
    am getting new errors as follows:

    error: no match for 'operator >>' in (&std::cin)->std::basic_istream<_CharT,_Traits>:: operator>> [ with _CharT = char, _Traits = std::char_Traits

    Please help
    Last edited by exus69; 02-12-2011 at 06:37 AM.

  11. #11
    a_capitalist_story
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    You don't use endl on input streams, like you are here:

    Code:
    cin >> studid >> endl ;
    endl is for outputting a new line character and flushing the output buffer.

  12. #12
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    Problem Solved

    Ok so finally my problem is solved and these are the two changes that
    I made to the existing code :

    1) Added using "namespace std ;" (excluding " ") below #include <iostream>

    2) Removed endl after cin


    Thanks everyone for their inputs. Highly appreciated

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