printf char* code example

Example 1: printf signed char

%c   --- char
%hh  --- signed char (synomous with char)
%hhu --- unsigned char
%h   --- short
%hu  --- unsigned short
%d   --- int
%u   --- unsigned int
%lu  --- unsigned long (including size_t, which is returned by sizeof())

Example 2: printf char value

char ch = 'a';
printf("%d", ch);