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:

Quote:

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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)

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when I try to compile it (in Dev-C++).

Here is the source code:

Code:

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#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;
}

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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...

insert the line:

using namespace std;

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

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

We wouldn't even have to answer it if you browser the FAQ a little.

Quote:

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Originally Posted by CornedBee

We wouldn't even have to answer it if you browser the FAQ a little.

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I'm sorry... I didn't see the FAQ... -.-

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

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

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

So does it works like this?

Code:

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using namespace something;
// all the code here has something::
using namespace something2;
// all the code here has something2::

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, or like this :

Code:

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using namespace something;
// all the code here has something::
using namespace something2;
// all the code here has something::
// all the code here has something2::

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