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| author | Silvino <silvino@bk.ru> | 2019-06-26 16:58:13 +0100 |
|---|---|---|
| committer | Silvino <silvino@bk.ru> | 2019-06-26 16:59:06 +0100 |
| commit | 2830b5fb96cce787ca8c7562a968effc3e57bdb1 (patch) | |
| tree | d8f3c09d0b52806ecc97e447655eb99f17a126e8 /dev/c/hello.html | |
| parent | 0e5a601a31840e1531f3f90ca447bf3b1e766d73 (diff) | |
| download | doc-2830b5fb96cce787ca8c7562a968effc3e57bdb1.tar.gz | |
dev index re-organization
Diffstat (limited to 'dev/c/hello.html')
| -rw-r--r-- | dev/c/hello.html | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/dev/c/hello.html b/dev/c/hello.html new file mode 100644 index 0000000..ff31bc9 --- /dev/null +++ b/dev/c/hello.html @@ -0,0 +1,134 @@ +<!DOCTYPE html> +<html dir="ltr" lang="en"> + <head> + <meta charset='utf-8'> + <title>C & GDB</title> + </head> + <body> + <a href="../index.html">C & GDB Index</a> + + <h1>Hello World</h1> + + <p>C "allows to implement" or approach to various + programming paradigms but due to it's characteristics + it's more a procedural language. C procedural programs + are divided in smaller procedures, or functions, and + data or pointers to data are passed into them or is + shared between them. To get started create file + hello.c with;</p> + + <pre> + #include <stdio.h> + + 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 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">C & GDB Index</a> + <p> + This is part of the Hive System Documentation. + Copyright (C) 2019 + Hive Team. + See the file <a href="../../fdl-1.3-standalone.html">Gnu Free Documentation License</a> + for copying conditions.</p> + </body> +</html> |