Linux Format forums

youlikeicecream · Posted: Wed Jun 22, 2005 5:54 pm Post subject: C++ probs

Hi, bit new to C++ ... have written simple programs in C and compiled them on a remote UNIX shell using CC before but now when I try to compile programs on my Linuxbox at home It basically wont compile a damn thing. Here is the code I am using ....

***********************************************

#include <iostream.h>

main()
{

cout << "Hello World! ";
}

**********************************************

--- I type (as root) :

# gcc hello.c -o helloprog

--- and get these errors :

hello.c:1:22: iostream.h: No such file or directory
hello.c: In function `main':
hello.c:6: error: `cout' undeclared (first use in this function)
hello.c:6: error: (Each undeclared identifier is reported only once
hello.c:6: error: for each function it appears in.)

also I did a quick search for iostream.h and found it under /usr/include/c++/3.3/backward/iostream.h

but I still got the same error message that it could not be found!!

can anyone help? Am I doing something really stupid or is something improperly installed?

thanks
Mike Smile

wiz · Posted: Wed Jun 22, 2005 6:58 pm Post subject:

Try using

g++ hello.c -o helloprog

I think you need the the c++ compiler.

1slipperyfish · Posted: Wed Jun 22, 2005 7:37 pm Post subject:

i used

alloydog · LXF regular Joined: Thu Apr 07, 2005 8:32 pm Posts: 600

Also, try losing the .h from the iostream
I found this with g++. I got the message that the .h has been depreciated, but it still compiled, after I ignored the warning. Rerunning the compiler with just #include <iostream.h> worked fine with out any messages.

For C++, don't you need to save the inital file with the extention .cpp?

It seems nearly every "Hello World" tutorial is different! As one of the more recent one's followed gave:

youlikeicecream · Posted: Thu Jun 23, 2005 11:30 am Post subject:

I managed to get Kdevelop to compile a simple KDE application after installing a whole heap of stuff but I cannot get a single peice of my code to run.

Thanks for the info guys Smile

Mike

1slipperyfish · Posted: Thu Jun 23, 2005 7:18 pm Post subject:

otrus · Joined: Mon Jan 02, 2006 1:11 am Posts: 5 Location: Norway

I had a similar problem. When I compiled using 'gcc -o hello hello.cpp' it returned a whole lot of errors. However, when I used 'g++ -o hello hello.cpp' it worked perfectly well. I tried using the '-x c++' option to specify c++ as the language, but that didn't work either. After a bit of research I found out that gcc didn't link to the c++ library, and even thogh I tried to explicitly specify the library I never got it to work. I probably didn't install the library properly.

Anyway, that's not a big problem since I can just use 'g++' to make everything work.