The printf project was done by Jude Okpara, a C13 Software Engineering student at ALX. A function named "_printf" imitates the actual "printf" C command/function located in the stdio.h library. 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) |
| p | Pointer address |
| r | Reverse string of characters |
| R | ROT13 translation of string |
| S | String with special chars replaced by their ASCII value |
| % | 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 |
| Length | Description | Specifiers |
|---|---|---|
| l | Prints a long int or unsigned long int | i, d, o, u, x and X |
| h | Prints a short int or unsigned short int | i, d, o, u, x and X |
Jude Okpara.