hello.c

Micro420 · 11-22-2006, 06:15 PM

I am just trying to print a simple "Hello, world!" but it won't work. Here is the content of hello.c

Code:

main()
{
	printf("hello, world\n");
}

I then type cc hello.c and I get some errors. Isn't cc a C compiler?

Also, if I add the \a, is the computer supposed to beep?

Code:

main()
{
	printf("hello, world\n");
        printf("\a");
}

dmail · 11-22-2006, 07:02 PM

Code:

#include <stdio.h>

int main(int argc, char *argv[])
{

	printf("hello, world\n");
	printf("\a");
	return 0;
}

if the file is saved as hello_world.c

Quote:

gcc hello_world.c

man gcc for options.

vxc69 · 11-22-2006, 07:02 PM

Try:

Code:

#include <stdio.h>

main()
{
        printf("hello, world\n");
        printf("\a");
}

That should get rid of the warning. Then cc hello.c -o hello
This should make a binary called hello.

Without the "-o" flag it will only make assembler output (a.out) and no binary. You can run a.out like any other binary. I never bothered trying that.

vxc

bigearsbilly · 11-23-2006, 03:38 AM

you can use

make hello

Code:

billym.primadtpdev>make hello   
gcc     hello.c   -o hello

to do the in-built make rules.

(no you don't need a makefile)

Micro420 · 11-25-2006, 09:20 PM

Great! Adding the #include <stdio.h> did the trick! I can print Hello, world now!

BiThian · 11-26-2006, 12:26 AM

Even if you don't add #include <stdio.h> you receive at most a warning like this one:

Code:

implicit declaration of printf

but the code still gets compiled.

Micro420 · 11-26-2006, 12:43 PM

Quote:

Originally Posted by BiThian

Even if you don't add #include <stdio.h> you receive at most a warning like this one:

Code:

implicit declaration of printf

but the code still gets compiled.

Thanks! I edited my post so others may not know what you are talking about. I was getting that warning error, but I later installed some build tools on my Ubuntu Linux and that warning message went away. But you are correct in that the binary was still able to build after the warning message. Now it's time to learn more about C! I've ordered tons of books on C and am eager to learn this language.

BiThian · 11-26-2006, 12:55 PM

I think these two books are enough

Kernighan & Ritchie - C Programming Language
Stephen Prata - C Primer Plus (5th Edition) ( a ***** book

)