walkoss / my_printf

Implementation of C function : printf

#####Implementation of C function : printf

int  my_printf(char *format, ...);

###To use it:

make And you will get two libraries. Compile with one of them to use my_printf function. Example with the file test.c given in test folder gcc test/test.c libmy_printf_'uname -m'-'uname -s'.a or gcc test/test.c libmy_printf_'uname -m'-'uname -s'.so uname -m and uname -s depends on your system

####Syntax to format:

% [flags] [width] [.precision] [length modifier] specifier type

####Flags:

Flag	Description
+	Sign displayed even if positive number is passed.
#	Used with o, x or X specifiers the value is preceeded with 0, 0x or 0X respectively for values different than zero.

####Width:

If defined, width allows you to print only n characters where n is equal to what you have assigned to width

#####Example:

my_printf("%10d\n", 42);

will result to

        42

####Precision:

If defined, precision allows you to print only n characters of your variable where n is equal to what you have assigned to precision. Precision number is define after a dot .

#####Example:

my_printf("%.2f\n", 2.0012);

will result to

2.00

For %f specifier type, precision number is used to display only n after the dot n of the float To know more about the precision, please go there : http://man7.org/linux/man-pages/man3/sprintf.3.html

####Specifiers type:

Specifier type	Output format
d or i	Signed decimal integer
u	Unsigned decimal integer
o	Unsigned octal integer
x	Unsigned hexadecimal integer
X	Unsigned hexadecimal integer (uppercase)
f	Decimal floating point, lowercase
e	Scientific notation (mantissa/exponent), lowercase
E	Scientific notation (mantissa/exponent), uppercase
c	Character
s	String of characters
p	Pointer address
n	Lenght of string
%	Escape % char

####Length Modifier:

Length Modifier	Type
ll	long long int or unsigned long long int
l	long int or unsigned long int
hh	signed char or unsigned char
h	short int or unsigned short int
j	intmax_t or uintmax_t
z	size_t or ssize_t
t	ptrdiff_t