/printf

C Custom Printf Function

Primary LanguageC

printf:tada:

Description:page_facing_up:

printf.jpg

The printf function sends formatted output to stdout. A custom _printf() for learning purposes was developed by cohort #15 student taking ALX software engineerging program.

_printf() function format string is a character string, beginning and ending in its initial shift state, if any. These arguments are placed using the percentage '%' operator.

Resources

printf format identifiers

Authorized functions and macros

write (man 2 write) malloc (man 3 malloc) free (man 3 free) va_start (man 3 va_start) va_end (man 3 va_end) va_copy (man 3 va_copy) va_arg (man 3 va_arg)

Compilation:alembic:

The code must be compiled this way:

$ gcc -Wall -Werror -Wextra -pedantic *.c

Use & Examples

Prototype: int _printf(const char *format, ...); Use - General: _printf("format string", var1, var2, ...);

Examples:

  • Basic String: _printf("%s Alx", "Hello");`

    • Output: Hello Alx

  • Print integers: _printf("This is an array element: arr[%d]:%c", 32, arr[32]);`

    • Output: This is an array element arr[32]:A

Many other specifiers and flags were added and by combinig those the _printf() function generate a different ouput. The following list are the specifiers and flags allowed.

Use & Examples

Specifiers
Specifier Output Examples
c Character y
d or i Signed integer 1024, -1024
s String of characters Hello Alx
b Binary Representation of unsigned integer 01010110
u Unsigned integer 1024
o Unsigned octal 432
x Unsigned hexadecimal integer 3ca
X Unsigned hexadecimal integer (uppercase) 3CA
S String with hex-ascii value replacing special chars \x0A\x0A
p Pointer address 0x403212
r Reversed string of characters dlroW olleH
R ROT13 Translation of string Uryyb

Files contained in this repository

Name Information Relevant Files
man_3_printf Man page of the _printf() function. None
main.h Header file with the data type struct, standard libraries and custom prototypes. *.c compilation
_printf.c Main printf function file. Calls other functions. printf_(name of var).c file
print_Percent.c Contains percentage print function. None
print_Integer.c Contains decimal and integer functions. None
print_Char.c Custom function for char data type. None
print_String.c Function that calls string type variable. None
print_Binary.c Function that gets the binary None
print_Octal.c Functions that returns octal number. None
print_hex.c Calls hexadecimal numbers (lowercase). None
print_HEX.c Calls hexadecimal numbers (Uppercase). None
print_Unsigned.c Returns an unisgined data type. None
print_CustomString.c Returns a string and non readable characters are printed in hexadecimal numbers (Lowercase). None
print_Reverse.c Returns a string in reverse. None
print_ROT13.c Returns a string in Rot13. None
_putchar.c Custom putchar function. None

Tasks required for this project

  1. I am not going anywhere. You can print that wherever you want to. I'm here and I am a Spur for life1.
    Write a function that produces output according to a format. Handle the following conversion specifiers:
  • c
  • s
  • %
  1. Education is when you read the fine print. Experience is what you get if you dont
    Handle the following conversion specifiers:
  • d
  • i
  1. Just because its in print doesn't mean its the gospel

    Create a man page for the function.

  2. With a face like mine, I do better in print

    Handle the following conversion specifiers:

  • b
  1. What one has not experienced, one will never understand in print
    Handle the following conversion specifiers:
  • u
  • x
  • o
  • x
  • X
  1. Nothing in fine print is ever good news

    Use a local buffer of 1024 chars in order to call write as little as possible. (not done)

  2. Handle the following custom conversion specifier
  • S : prints the string.
  • Non printable characters (0 < ASCII value < 32 or >= 127) are printed this way: \x, followed by the ASCII code value in hexadecimal (upper case - always 2 characters).
  1. How is the world ruled and led to war? Diplomats lie to journalists and believe these lies when they see them in print

    Handle the following conversion specifier: p

  2. The big print gives and the small print takes away

    Handle the following flag characters for non-custom conversion specifiers: (not done)

  • ´+´
  • space
  • ´#´
  1. Sarcasm is lost in print
    Handle the following length modifiers for non-custom conversion specifiers: (not done)
  • l
  • h Conversion specifiers to handle: d, i, u, o, x, X
  1. Print some money and give it to us for the rain forests

    Handle the field width for non-custom conversion specifiers. (not done)

  2. The negative is the equivalent of the composer's score, and the print the performance

    Handle the precision for non-custom conversion specifiers. (not done)

  3. It's depressing when you're still around and your albums are out of print

    Handle the 0 flag character for non-custom conversion specifiers. (not done)

  4. Every time that I wanted to give up, if I saw an interesting textile, print what ever, suddenly I would see a collection

    Handle the - flag character for non-custom conversion specifiers. (not done)

  5. Print is the sharpest and the strongest weapon of our party

    Handle the following custom conversion specifier:

  • r : prints the reversed string
  1. [The flood of print has turned reading into a process of gulping rather than savoring]
    Handle the following custom conversion specifier:
  • R: prints the rot13'ed string
  1. *
    All the above options work well together. (not done)

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