%

Percent sign 
c

Character 
d

Decimal integer 
e

Exponential format floatingpoint number 
E

Exponential format floatingpoint number with uppercase E 
f

Fixedpoint format floatingpoint number 
g

Floatingpoint number, in either exponential or fixed decimal notation 
G

Like
g
with uppercase E (if applicable) 
ld

Long decimal integer 
lo

Long octal integer 
lu

Long unsigned decimal integer 
lx

Long hexadecimal integer 
o

Octal integer 
s

String 
u

Unsigned decimal integer 
x

Hexadecimal integer 
X

Hexadecimal integer with uppercase letters 
p

The Perl value's address in hexadecimal 
n

Special value that stores the number of characters output so far into the next variable in the parameter list.
