HI, I Am new to the Linux OS and I would like someone to help me solve a problem that I am having.

I have written the first program in the book Begining inux Programming 3rd Edition. The source code is:

#include <stdio.h>

int main()
{
    printf("Hello World");
    exit(0);
}
It's a very simple program which I saved in my home directory as hello.c.

However, when I compile this program at the bash command line I get the following error message:

charles@linux:~> gcc -o hello hello.c
hello.c: In function ‘main’:
hello.c:6: warning: incompatible implicit declaration of built-in function ‘exit’

Is there something wrong with the program or could I be missing some libraries or development tools?

You need to add
    #include <stdlib.h>

You could also turn off the warning, but adding the stdlib is the better answer.

Thanks.

But now I am not getting any out put from the program hello.c.

Is there something else I should do?

How are you executing the program???

When you execute it, you shouldn't be using "hello.c" at all.

Should just be able to type
    hello
at the command prompt.

Hi!

Whenever I type hello at the command line I get the following message:
charles@linux:~> hello
bash: hello: command not found

IS there something else that I can do to correct this?

try
The './' tells bash to look for hello in the current working directory

--
Charlie Harvey's website - linux, perl, java, anarchism and punk rock: http://charlieharvey.org.uk