/printf

This repository is for alx school printf project

Primary LanguageC

_printf()

The _printf project is a collaboration between Adejumo Adeyemi and Obakoyowa Ayobami, students of Software Engineering cohort 9 at ALX Africa. The function named "_printf" imitates the actual "printf" function located in the stdio.h library of C programming language. It contains some of the basic features and functions found in the manual 3 of "printf".

_printf() is a function that performs formatted output conversion and print data. Its prototype is the following:

int _printf(const char *format, ...)

Where format contains the string that is printed. As _printf() is variadic function, it can receives n arguments that replace by n tags written inside the string.

The format tags prototype is the following:

%[flags][length]specifier

If the program runs successfully, the return value is the amount of chars printed.

Specifier Output
c Character
d or i Signed decimal integer
s String of characters
b Signed binary
o Signed octal
u Unsigned integer
x Unsigned hexadecimal
X Unsigned hexadecimal (uppercase)
% Character
Flags Description Specifiers
+ Prints a plus sign (+) when the argument is a positive number. In other case, prints a minus sign (-). i, d
(space) Prints a blank space if the argument is a positive number i, d
# Prints 0, 0x and 0X for o, x and X specifiers, respectively. It doesn't print anything if the argument is zero o, x, X

Examples

  1. Printing the string of chars "Hello, Holberton":

    • Use: _printf("Hello %s.", "world!");

    • Output: Hello world!.

  2. Printing an integer number:

    • Use: _printf("10 + 10 is equal to %d.", 20);

    • Output: 10 + 10 is equal to 20.

  3. Printing a binary, octal and hexadecimal:

    • Use: _printf("10 in binary is [%b], in octal is [%o] and in hexadecimal is [%x]", 5, 5, 5);

    • Output: 10 in binary is [1010], in octal is [12] and in hexadecimal is [A]

  4. Printing a string codified in ROT13:

    • Use: _printf("Hello in ROT13 is %R", "Hello");

    • Output: Hello in ROT13 is Urybb

Using flags and length tags:

  1. Printing the string of chars "Hello, Holberton":

    • Use: _printf("2 * 2 = %+d and 5 * -5 = %+i", 4, -25);

    • Output: 2 * 2 = +4 and 5 * -5 = -25

  2. Printing a long integer number and short integer number:

    • Use: _printf("1 million as a long int is %ld, but as a short int is %hd", 1000000, 1000000);

    • Output: 1 million as a long int is 1000000, but as a short int is 16960

File Functions

_printf.c

Own Printf Function Tha Performs Formatted Output Conversion And Print Data.

main.h

Header File Were All Prototypes Are Saved.

get_spec_func.c

Pointer To A Function That Selects The Correct Function To Perform The Operation.

print.c

Function That Prints The Buffer.

handl_buffer.c

Function That Concatenates The Buffer Characters.

print_char.c

Contains:

Function That Writes The Character C To Stdout.

/* Indetifier : %c */

print_str.c

Function That Writes The String To Stdout.

/* Indetifier : %s */

print_int.c

Function That Prints An Integer.

/* Indetifier : %i or %d */

print_bnr.c

Function That Prints Decimal In Binary.

/* Indetifier : %b */

print_oct.c

Function That Prints Decimal In Octal.

/* Indetifier : %o */

print_hex.c

Function That Prints Decimal In Hexadecimal.

/* Indetifier : %x */

print_upx.c

Function That Prints Decimal In Uppercase Hexadecimal.

/* Indetifier : %X */

print_unt.c

Function That Prints An Unsigned Integer.

/* Indetifier : %u */

Authors

Adejumo Adeyemi and Obakoyowa Ayobami.

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