int printf (char * format, ... );

printf will convert an arbitrary number of parameters and using the format string assign those into a string and send them to the serial port (SOUT)

format may be a simple string in which case that string is printed

or it can contain parameters to be filled with values

     %c     -- replace this with a single character

     %s     -- replace this with a string

     %d     -- replace with a decimal value

     %x     -- replace with a hexadecimal value (%X upshifts A-F)

     %u     -- replace with the unsigned decimal value

In addition there are modifiers to further control the output string

     %#d    -- where # indicates how many characters will be used to represent the value -- in this case the value is right justified and blank filled

     %0#x   -- in this case the number is right justified but 0 filled for # total spaces

     %-#s    -- this left justifies the string and fills the right side with spaces

 

NOTE:-  the printf.c library generates 2 warnings on "dereferencing type-punned pointer will break strict-aliasing rules"

• putchar
• puts