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Perl Pocket Reference, 5th Edition by Johan Vromans

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Formatted Printing

printf and sprintf format a list of values according to a format string that may use the following conversions:

%%

A percent sign.

%b

An unsigned integer (binary).

%c

The character corresponding to the ordinal value.

%d

A signed integer.

%e

A floating-point number (scientific notation).

%f

A floating-point number (fixed decimal notation).

%g

A floating-point number (%e or %f notation).

%i

A synonym for %d.

%n

The number of characters formatted so far is stored into the corresponding variable in the parameter list.

%o

An unsigned integer (octal).

%p

A pointer (address in hexadecimal).

%s

A string.

%u

An unsigned integer (decimal).

%x

An unsigned integer (hexadecimal).

%B

Like %b, but using an uppercase B.

%D

An obsolete synonym for %ld.

%E

Like %e, but using an uppercase E.

%F

An obsolete synonym for %f.

%G

Like %g, but with an uppercase E (if applicable).

%O

An obsolete synonym for %lo.

%U

An obsolete synonym for %lu.

%X

Like %x, but using uppercase letters.

The following flags can be put between the % and the conversion letter:

space

Prefix a positive number with a space.

+

Prefix a positive number with a plus sign.

-

Left-align within the field.

0

Use zeros instead of spaces to right-align.

#

With o, b, x, and X: prefix a nonzero number with 0, 0b, 0x, or 0X.

number

Minimum field width.

.number

For a floating-point number, the number of digits after the decimal point. For a string, the maximum length. For an integer, the minimum width. The integer will be right-aligned, padded with zeros.

h

Interpret integer as C type ...

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