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<!DOCTYPE html>
<html dir="ltr" lang="en">
    <head>
	<meta charset='utf-8'>
	<title>C &amp; GDB</title>
    </head>
    <body>
	<a href="../index.html">Development Index</a>

	<h1>C &amp; GDB</h1>

	<h2 id="hello">Hello World</h2>

	<p>Create file hello.c with;</p>

	<pre>
	#include &lt;stdio.h&gt;

	int main() {
	    printf("Hello World!");
	    return 0;
	}
	</pre>

	<p>Compile;</p>

	<pre>
	$ gcc -Wall hello.c -o hello
	</pre>

	<p>Run;</p>

	<pre>
	$./hello
	Hello World!
	</pre>

	<h2 ="sources">Multiple Sources</h2>

	<p>To organize code in multiple files split above
	example in main.c, hello.c and hello.h. Content of
	main.c;<p>

	<pre>
	#include "hello.h"

	int main() {
	    hello("world");
	    return 0;
	}
	</pre>

	<p>Header file contains declaration of the function hello,
	content of hello.h;</p>

	<pre>
	void hello(const char* name);
	</pre>

	<p>Implementation of hello function in hello.c;</p>

	<pre>
	#include &lt;stdio.h&gt;
	#include "hello.h"

	void hello(const char* name) {
	    printf("Hello, %s!\n", name);
	}
	</pre>

	<p>Compile;</p>

	<pre>
	$ gcc -Wall main.c hello.c -o hello
	</pre>

	<h2 id="makefile">Makefile</h2>

	<p>Make reads a Makefile by default on current directory,
	Makefile defines targets, for example executables and their
	dependencies, for example object files and source files.<p>

	<p>Create Makefile;</p>

	<pre>
	CC=gcc
	CFLAGS=-Wall

	hello: main.o hello.o

	clean:
		rm -f hello main.o hello.o
	</pre>

	<pre>
	$ touch NEWS README AUTHORS ChangeLog
	</pre>

	<h2 id="debug">Debug</h2>

	<p>To use gdb you need to compile program with -g flag. Change
	Makefile</p>

	<pre>
	CC=gcc
	CFLAGS=-Wall -g

	hello: main.o hello.o

	clean:
		rm -f hello main.o hello.o
	</pre>

	<pre>
	$ gdb hello
	</pre>

	<p>Set break point;</p>

	<pre>
	(gdb) break main
	</pre>

	<p>To start the program you can type run, this way gdb
	will try to run the program until the end. If program
	crash, gdb will stop it for debuging. Start program;</p>

	<pre>
	(gdb) run
	</pre>

	<p>Step in next line;</p>

	<pre>
	(gdb) s
	</pre>

        <p>Print variable "name" value;</p>

        <pre>
        (gdb) print name
        $1 = 0x4005b0 "world"
        (gdb)
        </pre>

        <p>Print variable "name" type;</p>

        <pre>
        (gdb) ptype name
        type = const char *
        (gdb)
        </pre>

        <p>Variable is a <a href="elements.html#const">string constant</a>.
        Execute next line to end;</p>

	<pre>
	(gdb) n
	</pre>

	<a href="../index.html">Development Index</a>
	<p>
	This is part of the c9-doc Manual.
	Copyright (C) 2016
	c9 team.
	See the file <a href="../../fdl-1.3-standalone.html">Gnu Free Documentation License</a>
	for copying conditions.</p>
    </body>
</html>