I want to "speak" a new language

[otey]

Hi

I know PHP, but where does that leave me, when i want to write some of them cool textbaced linux programs. I want to learn some of the heavy stuff :p

I've been looking at some "c" but I don't know where to start. I found this tutorial though. http://www.physics.drexel.edu/courses/Comp_Phys/General/C_basics/c_tutorial.html

but i'm a little confused..

When i try to compile the first example with gcc, i get errors.

The example is:

#include < stdio.h>

void main()
{
printf("\nHello World\n");
}

The errors are:

otey@osys:~/otey_development/c$ gcc hello.c
hello.c:1:20: error: stdio.h: No such file or directory
hello.c: In function 'main':
hello.c:5: warning: incompatible implicit declaration of built-in function 'printf'
hello.c:4: warning: return type of 'main' is not 'int'

If i replace #include < stdio.h> with #include <stdio.h> i get some of the same errors, but the code is compiled to an a.out file.

Should i
a) Proceed with the tutorial, and just remove the whitespace in every #include thingee
b) Get a new tutorial somewhere
c) Correct something on my system
d) Forget about the stupid idea about programming, and go back to bed

Hope to get answers

[kairu0]

The About.com tutorial isn't bad: http://cplus.about.com/od/beginnerctutoria1/l/blctut.htm

And C compiles the binary as a.out when you don't specify an output file.

Try:


gcc hello.c -o hello

[skirkpatrick]

Something isn't right with your tutorial. There should be no whitespace between < and > in the include.

Since you didn't tell gcc what to call your resulting executable file, it defaults to a.out. You can run it by using ./a.out from the commandline. Also, you can specify it when you compile it: gcc -o hello hello.c

[m87]

If i replace #include < stdio.h> with #include <stdio.h> i get some of the same errors, but the code is compiled to an a.out file.

Should i
a) Proceed with the tutorial, and just remove the whitespace in every #include thingee
b) Get a new tutorial somewhere
c) Correct something on my system
d) Forget about the stupid idea about programming, and go back to bed

Hope to get answers
you will still get this warning

hello.c:4: warning: return type of 'main' is not 'int' but you should definitely change tutorial, I don't have any suggestions, though :confused:
and don't give up! :)

[Burke]

The reason for the return type error is that The newer revisions of C don't support a return type of void for main. You'll have to use "int main" instead. Then as the last statement inside your curly braces put "return 0;". I'll find a good tutorial for you and post it here in a few.

[Burke]

Here's a great one. Its what I used to get started:

http://www.cprogramming.com/tutorial/lesson1.html

That's actually C++, which I would recommend over C any day. The only real difference is that you'll use g++ in place of gcc.

You'll probably get bogged down a few lessons in, but as has already been said, don't give up. C++ is one of the best things you'll ever learn.

And if you want cool Linux textbased programs, I would consider Perl as well...

[bored2k]

For C && C++, I have been reading The C Programming Language (http://www.amazon.com/gp/product/0131103628/002-6053480-3710439?v=glance&n=283155) and Teach Yourself C++ in 21 Days (http://www.amazon.com/gp/product/0672327112/qid=1136521279/sr=2-2/ref=pd_bbs_b_2_2/002-6053480-3710439?s=books&v=glance&n=283155).

[Burke]

I would recommend the same. Then once you've got a bit of experience under your belt, spring for a copy of the C++ programming language. IMO, its one of the very best.

[otey]

Thank you for your answers.. I forgot to ask if I should learn C or C++, but you answered that anyway.. Thank you!

[thumper]

Book wise I think that the best one to learn C++ from is "Accelerated C++" by Koenig and Moo.

Bjarne's "C++ programming language" I didn't find as useful as "The C++ Standard Library: A Tutorial and Reference" by Nicolai Josuttis. I have a copy, but I don't tend to refer to it. It's not even on my desk at work :)

[noob_Lance]

it should be int main() {}
yes its stupid... but jsut do it and it should work

[otey]

it should be int main() {}
yes its stupid... but jsut do it and it should work

Works now. But don't think i should continue with the tutorial. But thanks anyway