This is a collaboration project between Godswill Ubah and Kebron Araya who are both students in the ALX Africa software engineering program. In this project we were asked to create our own _printf() function, that replicates the standard printf() function in the <stdio.h> library.
For this project, we are expected to look at these concepts:
- Printf function in C
- Prints a string to the standard output according to a given format.
- The
\_printf()is a variadic function that accepts arguments and replaces the tags written in the strings. - If the program runs successfully, the return value is the amount of chars printed or -1 otherwise.
- Group Projects
- Pair Programming
- Flowcharts
- Technical Writing
- Allowed editors:
vi,vim,emacs - All your files will be compiled on Ubuntu 20.04 LTS using
gcc, using the options-Wall -Werror -Wextra -pedantic -std=gnu89 - All your files should end with a new line
- A
README.mdfile, at the root of the folder of the project is mandatory - Your code should use the
Betty style. It will be checked usingbetty-style.plandbetty-doc.pl - You are not allowed to use global variables
- No more than 5 functions per file
- In the following examples, the
main.cfiles are shown as examples. You can use them to test your functions, but you don’t have to push them to your repo (if you do we won’t take them into account). We will use our ownmain.cfiles at compilation. Ourmain.cfiles might be different from the one shown in the examples - The prototypes of all your functions should be included in your header file called
main.h - Don’t forget to push your header file
- All your header files should be include guarded
- Note that we will not provide the
_putcharfunction for this project
There should be one project repository per group. The other members do not fork or clone the project to ensure only one of the team has the repository in their github account otherwise you risk scoring 0%
- Your code will be compiled this way:
$ gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c- As a consequence, be careful not to push any c file containing a
mainfunction in the root directory of your project (you could have atestfolder containing all your tests files includingmainfunctions) - Our main files will include your main header file (
main.h):#include main.h - You might want to look at the gcc flag
-Wno-formatwhen testing with your_printfand the standardprintf - We strongly encourage you to work all together on a set of tests
- If the task does not specify what to do with an edge case, do the same as
printf
Print the string of characters in "Hello World":
Input:
\_printf("Hello World!");Output:
Hello World!0. I'm not going anywhere. You can print that wherever you want to. I'm here and I'm a Spur for life
Write a function that produces output according to a format.
- Prototype: int _printf(const char *format, ...);
- Returns: the number of characters printed (excluding the null byte used to end output to strings)
- write output to stdout, the standard output stream
- format is a character string. The format string is composed of zero or more directives. See man 3 printf for more detail. You need to handle the following conversion specifiers:
cs% - You don’t have to reproduce the buffer handling of the C library printf function
- You don’t have to handle the flag characters
- You don’t have to handle field width
- You don’t have to handle precision
- You don’t have to handle the length modifiers
Handle the following conversion specifiers:
di- You don’t have to handle the flag characters
- You don’t have to handle field width
- You don’t have to handle precision
- You don’t have to handle the length modifiers
The project is finished
The provided content was developed in collaboration with the following students: