This is a reimplementation of the function printf included in libc. This implementation cover the following set of flags and conversions, besides the availability of the width and precision modifiers.
| Flag | Description |
|---|---|
| - | Left-justify within the given field width; Right justification is the default. |
| 0 | Left-pads the number with zeroes(0) instead of space. |
| + | Add a plus sign '+' int the front of positive numeric conversions |
| If no sign is going to be written, a blank space is inserted before the value. | |
| # | Used with x or X specifiers. Add (0x) in front of values different than zero. |
| num | Number between % and the specifier is the minimum field width |
| . | precision |
| Specifiers | Description |
|---|---|
| c | Print a single character. |
| s | Print a string of characters |
| p | The void * pointer argument is printed in hexadecimal. |
| d | Print a decimal (base 10) number. |
| i | Print an integer in base 10. |
| u | Print an unsigned decimal (base 10) number. |
| x | Print a number in hexadecimal (base 16) |
| % | Print a percent sign '%' |
For the specifier d and i, the precision is the minimum number of digits to be print.
For the specifier s, the precision is the maximum field width.
Stay tuned when:
- Flag '0' is ignored when flag '-' is present.
- Flag '0' is ignored when flag '.' is present (%d e %i)
- Flag '0' result in undefined behavior with specifier c, s and p
- FLag '.' result in undefined behavior with specifier c and p
Syntax to use printf:
%[flag][min-width].[precision][length modifier][conversion specifier]