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printf
Время создания: 15.07.2017 16:27
Раздел: Computer - Programming - C - Libraries

A format specifier follows this prototype:

%[flags][width][.precision][length]specifier



specifier

Output

Example

d or i

Signed decimal integer

392

u

Unsigned decimal integer

7235

o

Unsigned octal

610

x

Unsigned hexadecimal integer

7fa

X

Unsigned hexadecimal integer (uppercase)

7FA

f

Decimal floating point, lowercase

392.65

F

Decimal floating point, uppercase

392.65

e

Scientific notation (mantissa/exponent), lowercase

3.9265e+2

E

Scientific notation (mantissa/exponent), uppercase

3.9265E+2

g

Use the shortest representation: %e or %f

392.65

G

Use the shortest representation: %E or %F

392.65

a

Hexadecimal floating point, lowercase

-0xc.90fep-2

A

Hexadecimal floating point, uppercase

-0XC.90FEP-2

c

Character

a

s

String of characters

sample

p

Pointer address

b8000000

n

Nothing printed.
The corresponding argument must be a pointer to a signed int.
The number of characters written so far is stored in the pointed location.

%

A % followed by another % character will write a single % to the stream.

%



flags

description

-

Left-justify within the given field width; Right justification is the default (see width sub-specifier).

+

Forces to preceed the result with a plus or minus sign (+ or -) even for positive numbers. By default, only negative numbers are preceded with a - sign.

(space)

If no sign is going to be written, a blank space is inserted before the value.

#

Used with o, x or X specifiers the value is preceeded with 0, 0x or 0X respectively for values different than zero.
Used with a, A, e, E, f, F, g or G it forces the written output to contain a decimal point even if no more digits follow. By default, if no digits follow, no decimal point is written.

0

Left-pads the number with zeroes (0) instead of spaces when padding is specified (see width sub-specifier).



width

description

(number)

Minimum number of characters to be printed. If the value to be printed is shorter than this number, the result is padded with blank spaces. The value is not truncated even if the result is larger.

*

The width is not specified in the format string, but as an additional integer value argument preceding the argument that has to be formatted.



.precision

description

.number

For integer specifiers (d, i, o, u, x, X): precision specifies the minimum number of digits to be written. If the value to be written is shorter than this number, the result is padded with leading zeros. The value is not truncated even if the result is longer. A precision of 0 means that no character is written for the value 0.
For a, A, e, E, f and F specifiers: this is the number of digits to be printed after the decimal point (by default, this is 6).
For g and G specifiers: This is the maximum number of significant digits to be printed.
For s: this is the maximum number of characters to be printed. By default all characters are printed until the ending null character is encountered.
If the period is specified without an explicit value for precision, 0 is assumed.

.*

The precision is not specified in the format string, but as an additional integer value argument preceding the argument that has to be formatted.


The length sub-specifier modifies the length of the data type. This is a chart showing the types used to interpret the corresponding arguments with and without length specifier (if a different type is used, the proper type promotion or conversion is performed, if allowed):



specifiers

length

d i

u o x X

f F e E g G a A

c

s

p

n

(none)

int

unsigned int

double

int

char*

void*

int*

hh

signed char

unsigned char

signed char*

h

short int

unsigned short int

short int*

l

long int

unsigned long int

wint_t

wchar_t*

long int*

ll

long long int

unsigned long long int

long long int*

j

intmax_t

uintmax_t

intmax_t*

z

size_t

size_t

size_t*

t

ptrdiff_t

ptrdiff_t

ptrdiff_t*

L

long double





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