printf % type

%c/%C  char

%s  string 

%p  pointer value hexadecimal number

%d/%i  signed decimal number

%u  unsigned decimal number

%f/%F  float

%e/%E  ?(real number exponent ?)

%g/%G  according to size, if size is small, %f/ if big is, %e

%x/%X  hexadecimal number

%o octal number

%n  line feed