Team project : _printf
_printf - produces output according to a format
_printf FORMAT [ARGUMENT]...
_printf Print ARGUMENT(s) according to FORMAT
A character that specifies the type of conversion to be applied.
| conversion specifier | meaning |
|---|---|
| d, i | The int argument is converted to signed decimal notation |
| c | The int argument is converted to an unsigned char |
| s | the const char * argument is expected to be a pointer to an array of character type (pointer to a string). Characters from the array are written up to (but not including) a terminating null byte ('\0') |
| o | The unsigned int argument is converted to unsigned octal |
| u | The unsigned int argument is converted to unsigned decimal |
| x | The unsigned int argument is converted to unsigned hexadecimal by using the lowercase for lettres 'abcdef' |
| X | The unsigned int argument is converted to unsigned hexadecimal by using the uppercase for lettres 'ABCDEF' |
| S | This is a custom specifier that prints a String and replace a Non printable character (0 < ASCII value < 32 or >= 127) by \x followed by the ASCII code value in hexadecimal (upper case - always 2 characters) |
| p | The void * pointer argument is printed in hexadecimal. |
| r | This is a custom specifier that prints the reversed string |
| R | This is a custom specifier that prints the rot13'ed string |
The character % is followed by zero or more of the following flags:
| flag | meaning |
|---|---|
| + | A sign (+ or -) should always be placed before a number produced by a signed conversion. By default, a sign is used only for negative numbers. A + overrides a space if both are used. |
| ' ' | (a space) A blank should be left before a positive number (or empty string) produced by a signed conversion. |
| # | The value should be converted to an "alternate form": - For o conversions, the first character of the output string is made zero (by prefixing a 0 if it was not zero already). - For x and X conversions, a nonzero result has the string "0x" (or "0X" for X conversions) prepended to it. |
| 0 | The value should be zero padded. For d, i, o, u, x, X conversions, the converted value is padded on the left with zeros rather than blanks. If the 0 and - flags both appear, the 0 flag is ignored. |
| - | The converted value is to be left adjusted on the field boundary. (The default is right justification.) The converted value is padded on the right with blanks, rather than on the left with blanks or zeros. A - overrides a 0 if both are given. |
Here "integer conversion" stands for d, i, o, u, x, or X conversion:
| modifier | meaning |
|---|---|
| h | A following integer conversion corresponds to a short int or unsigned short int argument |
| l | A following integer conversion corresponds to a long int or unsigned long int argument |
An optional decimal digit string (with nonzero first digit) specifying a minimum field width. If the converted value has fewer characters than the field width, it will be padded with spaces on the left. Instead of a decimal digit string one may write "*" to specify that the field width is given in the next argument. In no case does a nonexistent or small field width cause truncation of a field; if the result of a conversion is wider than the field width, the field is expanded to contain the conversion result.
Authors: Yussef EL MEKKAOUI & HAJAR EL ABDELLAOUI