Programming Forums > Application Development > C++

gemini_shooter · Mar 3rd, 2005, 8:13 PM

Hi !

I am newbie trying to learn to code in C and I recently installed the Dev-C++ compiler I had a few questions about the compiler :

I tried to use some C++ syntax and the compiler gave me an error, in the documentation i read that the MiniGW which is the compiler system used gcc for C compiling and g++ for C++ compiling

The code is listed as follows :

(Toggle Plain Text)

#include<iostream>

main()
{
      cout << "Hello World";
      return 0;
}

The error I received was this :

Quote:

C:\Documents and Settings\Saurav Batra\My Documents\Code\TestCode\test.cpp In function `int main()':
5 C:\Documents and Settings\Saurav Batra\My Documents\Code\TestCode\test.cpp `cout' undeclared (first use this function)
(Each undeclared identifier is reported only once for each function it appears in.)

Here are the questions that popped up :

"Does the dev-C++ compiler compile only C code , if not how can I make it do only that if possible ????? "

Iam looking for a C compiler that compiles on only C code and not C++,

I was using visual C++ before to compile before, the problem with VC++ is that it allows you to mix C and C++ code and doesn't complain about.

It is also my fault to a great extent since I am trying to correct my programming style by being able to write code which is specific to C or C++ so any help with a C compiler would be appreciated. I am running windows XP

Mad_guy · Mar 3rd, 2005, 10:26 PM

There is virtually no compiler that compiles strictly C code and not C++, the problem isn't the compiler it's your code. Your code is incorrect and that's why it's not compiling it. It's not compiling your C++ code because the compiler thinks it's just fucked up C code or something.
You're forgetting to use the std namespace so cout and cin look undefined, you can make your program work one of two ways.

Method A. Save yourself typing and use namespace STD, as follows:

(Toggle Plain Text)

#include <iostream>
using namespace std;
int main() {
cout<<"Hello World!";
cin.get();
return 0;
}

Method B. No STD namespace and cause yourself a hell of a lot more typing:

(Toggle Plain Text)

#include <iostream>
int main() {
std::cout<<"Hello World!";
std::cin.get();
return 0;
}

You shouldn't blame all the issues on your compiler, rather your code.

Hope I clarified shit for you.

gemini_shooter · Mar 4th, 2005, 2:14 AM

yes u did , but then I have another one , how come the above code that i wrote compiles in VC++ but it doesn't in Dev-C++

1. I am guessing namespace is already default in VC++ but not in Dev-C++, if not what name space is Dev-C++ using

2. I am aware that MiniGW the compiler system in Dev-C++ has gcc (C compiler) and g++ (C++ compiler), this may sound stupid , but can i turn on off and still make the other one work.

Mad_guy · Mar 4th, 2005, 4:14 PM

Quote:

Originally Posted by gemini_shooter

yes u did , but then I have another one , how come the above code that i wrote compiles in VC++ but it doesn't in Dev-C++

1. I am guessing namespace is already default in VC++ but not in Dev-C++, if not what name space is Dev-C++ using

2. I am aware that MiniGW the compiler system in Dev-C++ has gcc (C compiler) and g++ (C++ compiler), this may sound stupid , but can i turn on off and still make the other one work.

1st question: Dev-CPP isn't using a "namespace," the 'std' namespace is a part of the ANSI C++ libraries and is included, once you get into programming with C++ more you'll understand exactly what namespaces are and how you can code them yourself. They're basically a way to refer to sections and hunks of all sorts of code. Classes, functions, constants ect, ect... I assume VC++ just searches through ALL the C++ libraries until it finds the cout and cin functions, and that's why it compiles them even if you don't specify what the namespace of which cout and cin are located is.

2nd question: Not sure.

arod199113 · Mar 4th, 2005, 5:09 PM

i dont know that much about c++ cause im just learning also
but the first code you entered was correct except for #include<iostream>
its supposed to be
#include <iostream.h> with a space between #include and <iostream.h>
and a ".h" after <iostream
and dev c++ compiles both c and c++

Ooble · Mar 4th, 2005, 5:46 PM

Arod, no it isn't. There are two libraries: iostream.h and iostream. The latter is a newer version of the former.

BaroN NighT · Mar 4th, 2005, 8:04 PM

or gemini shooter, u can code it like this:

#include<iostream>

using namespace std;

int main(){
cout << "Hello World" << endl;

system("pause");
return 0;
}

Mad_guy · Mar 4th, 2005, 8:05 PM

Quote:

Originally Posted by arod199113

i dont know that much about c++ cause im just learning also
but the first code you entered was correct except for #include<iostream>
its supposed to be
#include <iostream.h> with a space between #include and <iostream.h>
and a ".h" after <iostream
and dev c++ compiles both c and c++

That's incorrect.

The C++ ANSI standard states that the .h appendencies are not needed in C++ programs. While the C ANSI standard says that the .h to header files are required. Hence, why that code will compile fine without the .h appended to iostream.

This theory should also work fine for home-made libraries. For further proof, I suggest you look at the libraries of your compiler, specifically in the C++ section and you'll see they aren't .h files anyway.

You need to read more.

Quote:

Originally Posted by BaroN NighT

or gemini shooter, u can code it like this:

#include<iostream>

using namespace std;

int main(){
cout << "Hello World" << endl;

system("pause");
return 0;
}

I would rather you not use a system(); call in that program.

It really frusterates me when people do (use system(); commands) that unless they're strictly using Winsock or Win32 programming because it cuts down the portability issues on the code.

This is proper, easily portable code:

(Toggle Plain Text)

#include <iostream>
using namespace std;
int main() {
cout<<"Hello World!";
cin.get();
return 0;
}

BaroN NighT · Mar 4th, 2005, 8:09 PM

Quote:

Originally Posted by arod199113

i dont know that much about c++ cause im just learning also
but the first code you entered was correct except for #include<iostream>
its supposed to be
#include <iostream.h> with a space between #include and <iostream.h>
and a ".h" after <iostream
and dev c++ compiles both c and c++

C++ ignores spaces so there's no differences between #include<iostream> (without space) and #include <iostream> (with spaces)

arod199113 · Mar 4th, 2005, 8:21 PM

i said i didnt know

Quote:

i dont know that much about c++ cause im just learning also

Mar 3rd, 2005, 10:26 PM	#2
Mad_guy Hobbyist Programmer Join Date: Oct 2004 Location: Sandstorm, Techno Club Posts: 239 Rep Power: 4	There is virtually no compiler that compiles strictly C code and not C++, the problem isn't the compiler it's your code. Your code is incorrect and that's why it's not compiling it. It's not compiling your C++ code because the compiler thinks it's just fucked up C code or something. You're forgetting to use the std namespace so cout and cin look undefined, you can make your program work one of two ways. Method A. Save yourself typing and use namespace STD, as follows: (Toggle Plain Text) #include <iostream> using namespace std; int main() { cout<<"Hello World!"; cin.get(); return 0; } #include <iostream> using namespace std; int main() { cout<<"Hello World!"; cin.get(); return 0; } Method B. No STD namespace and cause yourself a hell of a lot more typing: (Toggle Plain Text) #include <iostream> int main() { std::cout<<"Hello World!"; std::cin.get(); return 0; } #include <iostream> int main() { std::cout<<"Hello World!"; std::cin.get(); return 0; } You shouldn't blame all the issues on your compiler, rather your code. Hope I clarified shit for you.

Mar 4th, 2005, 5:46 PM	#6
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	Arod, no it isn't. There are two libraries: iostream.h and iostream. The latter is a newer version of the former. __________________ Me :: You :: Them

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Mar 4th, 2005, 2:14 AM	#3
gemini_shooter Newbie Join Date: Mar 2005 Posts: 12 Rep Power: 0	yes u did , but then I have another one , how come the above code that i wrote compiles in VC++ but it doesn't in Dev-C++ 1. I am guessing namespace is already default in VC++ but not in Dev-C++, if not what name space is Dev-C++ using 2. I am aware that MiniGW the compiler system in Dev-C++ has gcc (C compiler) and g++ (C++ compiler), this may sound stupid , but can i turn on off and still make the other one work.

Mar 4th, 2005, 5:09 PM	#5
arod199113 Programmer Join Date: Feb 2005 Posts: 86 Rep Power: 0	i dont know that much about c++ cause im just learning also but the first code you entered was correct except for #include<iostream> its supposed to be #include <iostream.h> with a space between #include and <iostream.h> and a ".h" after <iostream and dev c++ compiles both c and c++

Mar 4th, 2005, 8:04 PM	#7
BaroN NighT Programmer Join Date: Mar 2005 Location: USA Posts: 60 Rep Power: 4	or gemini shooter, u can code it like this: #include<iostream> using namespace std; int main(){ cout << "Hello World" << endl; system("pause"); return 0; }

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Programming Forums > Application Development > C++

Newbie : need help with Dev-C++ compiler