Objective-C format output

% @ Object
% d,% i integer
% u unsigned integer
% f floating point / doubleword
% x,% X binary integer
% o octal integer
% zu size_t
% p pointer
% e floating point / doubleword (scientific calculation)
% g floating point / double word
% s C string
%. * s Pascal string
% c character
% C unichar
% lld 64-bit long integer (long long)
% llu unsigned 64-bit long integer
% Lf 64-bit double word
% e is a real number, calculated using scientific notation

Format character Description
% a a floating point value (only valid for C99)
% A Same as above
% c one character
% d decimal integer
% i decimal, octal, hexadecimal integer
% o octal integer
% x hexadecimal integer
% X Same as above
% c one character
% s A string that ends with a space, tab, or newline.
% f Real number, which can be entered in decimal or exponential form.
% F Same as above
% e Same as above
% E Same as above
% g as above
% G as above
% p a pointer
% u an unsigned decimal integer
% [] Scan character set
%%% symbol

Type NSlog characters
char% c
short% hi,% hx,% ho
unsigned short% hu,% hx,% ho
int% i,% x,% o
unsigned% u,% x,% o
long% li,% lx,% lo
unsigned long% lu,% lx,% lo
long long% lli,% llx,% llo
unsigned long long% llu,% llx,% llo
float% f,% e,% g,% a
double% f,% e,% g,% a
long double% Lf,% Le,% Lg
id% p 

From: http://www.cnblogs.com/jackbutler/archive/2012/04/05/2432828.html