Simplest question you will ever have to answer...

This is a discussion on Simplest question you will ever have to answer... within the C++ Programming forums, part of the General Programming Boards category; Hi, I'm learning C++, and I copied the code below out of a book I am learning from. It gives ...

  1. #1
    2 days into C++
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    Simplest question you will ever have to answer...

    Hi, I'm learning C++, and I copied the code below out of a book I am learning from. It gives me the errors:
    15 C:\Dev-Cpp\Projects\FirstProject\main.cpp `cout' undeclared (first use this function)
    15 C:\Dev-Cpp\Projects\FirstProject\main.cpp `endl' undeclared (first use this function)
    when I try to compile it (in Dev-C++).

    Here is the source code:

    Code:
    #include <iostream>
    #include <stdlib.h>
    int AddOne(int start)
    {
        int newnumber;
        newnumber = start + 1;
        return newnumber;
    }
    int main(int argc, char *argv[])
    {
        int testnumber;
        int result;
        testnumber = 20;
        result = AddOne(testnumber);
        cout << result << endl;
        system("PAUSE");
        return 0;
    }
    Can you tell me what's causing the problem? I just started learning C++ a day ago, and I haven't a clue what is wrong with this source code. Thank you soooo much!! It is probably a silly thing that I forgot to put in...
    Last edited by mattOmynameO; 12-17-2005 at 03:33 PM.

  2. #2
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    insert the line:

    using namespace std;

    right under the line: #include <stdlib.h>

    I'll let someone else explain what a namespace is.

  3. #3
    Cat without Hat CornedBee's Avatar
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    We wouldn't even have to answer it if you browser the FAQ a little.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  4. #4
    2 days into C++
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    Quote Originally Posted by CornedBee
    We wouldn't even have to answer it if you browser the FAQ a little.
    I'm sorry... I didn't see the FAQ... -.-

    And thank you for the helpful reply, ghosttownvoid. I appreciate it a lot.

  5. #5
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    Opening completly a namespace in the global scope is not a such good idea.
    Consider using the using namespace directive inside the main block

    or just using using std::cout and using std::endl

  6. #6
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    looks so messy using std::cout, one line to solve and make code more readable

  7. #7
    the Great ElastoManiac's Avatar
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    So does it works like this?
    Code:
    using namespace something;
    // all the code here has something::
    using namespace something2;
    // all the code here has something2::
    , or like this :
    Code:
    using namespace something;
    // all the code here has something::
    using namespace something2;
    // all the code here has something::
    // all the code here has something2::
    lu lu lu I've got some apples lu lu lu You've got some too lu lu lu Let's make some applesauce Take off our clothes and lu lu lu

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