cheat sheets.

%@			id
%d, %D, %i		long
%u, %U			unsigned long
%hi			short
%hu			unsigned short
%qi			long long
%qu			unsigned long long
%x, %X			unsigned long printed as hexadecimal
%o, %O			unsigned long printed as octal
%f, %e, %E, %g, %G	double
%c			unsigned char as ASCII character
%C			unichar as Unicode character
%s			char * (a null-terminal C string of ASCII characters)
%S			unichar * (a null-terminated C string of Unicode characters)
%p			void * (an address printed in hexadecimal with a leading 0x)
%%			a % character