printf() formatting codes

%d  Signed decimal integer.
%o  Signed octal integer.
%x  Signed hexidecimal integer (%X is the same but yield uppercase letters).
%ld Signed long decimal number. Can be applied to any of the above.
%u  Unsigned decimal number.
%lu Unsigned long decimal number.
%c  Single character.
%s  String.
%f  Float (six digits of precision).
%g  Float (up to six digits of precision).
%e  Float (up to six digits of precision; scientific notation).
%lf Double (six digits of precision).
%lg Double (up to six digits of precision).
%le Double (up to six digits of precision; scientfic notation).