Programming Forums > Application Development > C++

ivan · Dec 4th, 2005, 9:49 AM

As said for about 1000 times try to not use those old header files...

jayme · Dec 4th, 2005, 9:55 AM

i get undeclared function whenever i leave out the .h

with this simple code for example..

#include <iostream>

int main()
{
    cout << "hello ";
}

ill get this error

Quote:

Compiler: Default compiler
Executing g++.exe...
g++.exe "C:\Documents and Settings\jay\Desktop\dg.cpp" -o "C:\Documents and Settings\jay\Desktop\dg.exe" -I"d:\Dev-Cpp\lib\gcc\mingw32\3.4.2\include" -I"d:\Dev-Cpp\include\c++\3.4.2\backward" -I"d:\Dev-Cpp\include\c++\3.4.2\mingw32" -I"d:\Dev-Cpp\include\c++\3.4.2" -I"d:\Dev-Cpp\include" -L"d:\Dev-Cpp\lib"
C:\Documents and Settings\jay\Desktop\dg.cpp: In function `int main()':
C:\Documents and Settings\jay\Desktop\dg.cpp:5: error: `cout' undeclared (first use this function)
C:\Documents and Settings\jay\Desktop\dg.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)

Execution terminated

EDIT: well.. someone could have told me "using namespace::std;" always had to be included :o

Ooble · Dec 4th, 2005, 10:01 AM

cout is in the std namespace. It's std::cout now. You can leave off the "std::" part by putting:

(Toggle Plain Text)

using std::cout;

at the top of the functions you use it in.

You can also put the using declaration or:

(Toggle Plain Text)

using namespace std;

at the top of your programs (usually underneath your #includes), but this is generally not advisable.

lectricpharaoh · Dec 4th, 2005, 10:02 AM

Quote:

Originally Posted by Symptom

It very common to handle every incoming connection to the server, not in the parent process, but with child processes using

(Toggle Plain Text)

fork();

That way when the client is done with the server, the child process ends and, furthermore, the client is able to handle more than one connections simultaneously.
If you're programming under windows though, I don't know if you have a POSIX-like environment that supports these system calls...

To my knowledge, the gcc/gpp ports to DOS/Win32 don't support fork().

That said, why wouldn't you just use threads, POSIX or otherwise?

DaWei · Dec 4th, 2005, 10:15 AM

Quote:

EDIT: well.. someone could have told me "using namespace::std;" always had to be included

You're not reading enough of the threads, or reading them thoroughly enough, at least. You're still misconstruing scads of posts.

Dec 4th, 2005, 10:01 AM	#13
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	cout is in the std namespace. It's std::cout now. You can leave off the "std::" part by putting: (Toggle Plain Text) using std::cout; using std::cout; at the top of the functions you use it in. You can also put the using declaration or: (Toggle Plain Text) using namespace std; using namespace std; at the top of your programs (usually underneath your #includes), but this is generally not advisable. __________________ Me :: You :: Them

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Dec 4th, 2005, 9:49 AM	#11
ivan Professional Programmer Join Date: Sep 2005 Location: serbia & montenegro Posts: 484 Rep Power: 4	As said for about 1000 times try to not use those old header files...

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