C - Hello, World

General

• Why C programming is awesome (don’t forget to tweet today, with the hashtag #cisfun :))
• Who invented C
• Who are Dennis Ritchie, Brian Kernighan and Linus Torvalds
• What happens when you type gcc main.c
• What is an entry point
• What is main
• How to print text using printf, puts and putchar
• How to get the size of a specific type using the unary operator sizeof
• How to compile using gcc
• What is the default program name when compiling with gcc
• What is the official Holberton C coding style and how to check your code with betty-style
• How to find the right header to include in your source code when using a standard library function
• How does the main function influence the return value of the program

Requirements C

• Allowed editors: vi, vim, emacs
• All your files will be compiled on Ubuntu 14.04 LTS using gcc 4.8.4
• All your files should end with a new line
• A README.md file at the root of the holbertonschool-low_level_programming repo, containing a description of the repository
• A README.md file, at the root of the folder of this project, containing a description of the project
• There should be no errors and no warnings during compilation
• You are not allowed to use system
• Your code should use the Betty style. It will be checked using betty-style.pl and betty-doc.pl

0-preprocessor: Preprocessor

A script that runs a C file through the preprocessor and save the result into another file. The C file name will be saved in the variable $CFILE; The output should be saved in the file c using gcc $CFILE -E -o c.

1-compiler: Compiler

A script that compiles a C file but does not link. The C file name will be saved in the variable $CFILE; The output file should be named the same as the C file, but with the extension .o instead of .c;

Example: if the C file is main.c, the output file should be main.o using gcc -c $CFILE.

2-assembler: Assembler

A script that generates the assembly code of a C code and save it in an output file. The C file name will be saved in the variable $CFILE; The output file should be named the same as the C file, but with the extension .s instead of .c.

Example: if the C file is main.c, the output file should be main.s using gcc -S $CFILE.

3-name: Name

A script that compiles a C file and creates an executable named cisfun. The C file name will be saved in the variable $CFILE using gcc $CFILE -o cisfun.

4-puts.c: Hello, puts

A C program that prints exactly "Programming is like building a multilingual puzzle, followed by a new line.. Use the function puts; You are not allowed to use printf; Your program should end with the value 0 using:

#include <stdio.h>

int main(void) { puts("Programming is like building a multilingual puzzle\n"); return (0); }

5-printf.c: Hello, printf

A C program that prints exactly with proper grammar, but the outcome is a piece of art,, followed by a new line. Use the function printf; You are not allowed to use the function puts; Your program should return 0; Your program should compile without warning when using the -Wall gcc option using:

{ #include <stdio.h>

int main(void) { printf("with proper grammar, but the outcome is a piece of art,\n"); return (0); } }

6-size.c: Size is not grandeur, and territory does not make a nation

A C program that prints the size of various types on the computer it is compiled and run on. You should produce the exact same output as in the example; Warnings are allowed; Your program should return 0; You might have to install the package libc6-dev-i386 on your Linux (Vagrant) to test the -m32 gcc option using:

{ #include <stdio.h>

int main(void) { int a; long int b; long long int c; char d; float f;

printf("Size of a char: %lu byte(s)\n", (unsigned long)sizeof(d));
printf("Size of an int: %lu byte(s)\n", (unsigned long)sizeof(a));
printf("Size of a long int: %lu byte(s)\n", (unsigned long)sizeof(b));
printf("Size of a long long int: %lu byte(s)\n", (unsigned long)sizeof(c));
printf("Size of a float: %lu byte(s)\n", (unsigned long)sizeof(f));
return (0);

} }

100-intel: Intel

A script that generates the assembly code (Intel syntax) of a C code and save it in an output file. The C file name will be saved in the variable $CFILE. The output file should be named the same as the C file, but with the extension .s instead of .c.

Example: if the C file is main.c, the output file should be main.s using gcc -S -masm=intel $CFILE.

101-quote.c: UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity

A C program that prints exactly and that piece of art is useful" - Dora Korpar, 2015-10-19, followed by a new line, to the standard error. You are not allowed to use any functions listed in the NAME section of the man (3) printf or man (3) puts; Your program should return 1; Your program should compile without any warnings when using the -Wall gcc option using:

{ #include <stdio.h>

int main(void) { write(2, "and that piece of art is useful" - Dora Korpar, 2015-10-19\n", 61);

return (1);

} }