scanf, fscanf, sscanf

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< c | io

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C
 
File input/output
功能
Original:
Functions
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文件访问
Original:
File access
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直接输入/输出
Original:
Direct input/output
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fread
fwrite
未格式化的输入/输出
Original:
Unformatted input/output
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格式化输入/输出
Original:
Formatted input/output
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scanf
fscanf
sscanf
vscanf
vfscanf
vsscanf		（C99）
（C99）
（C99）
printf
fprintf
sprintf
snprintf


（C99）
vprintf
vfprintf
vsprintf
vsnprintf


（C99）
文件定位
Original:
File positioning
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ftell
fgetpos
fseek
fsetpos
rewind
错误处理
Original:
Error handling
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clearerr
feof
ferror
perror
对文件的操作
Original:
Operations on files
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remove
rename
tmpfile
tmpnam
 
Defined in header <stdio.h>
​int scanf( const char *format, ... );​
 (1)
int fscanf( FILE *stream, const char *format, ... );
 (2)
int sscanf( const char *buffer, const char *format, ... );
 (3)
从各种来源中读取数据，解释它根据format，并将结果存储到特定地点.....
Original:
Reads data from the a variety of sources, interprets it according to format and stores the results into given locations.
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1)
读取数据从stdin
Original:
reads the data from stdin
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2)
从文件流stream读取数据
Original:
reads the data from file stream stream
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3)
null结尾的字符串buffer读取数据
Original:
reads the data from null-terminated character string buffer
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目录

[编辑] 参数

stream -
输入文件流中读取
Original:
input file stream to read from
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buffer -
指针指向一个空结束的字符串读取
Original:
pointer to a null-terminated character string to read from
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format -
指针指向一个空结束的字符串指定如何读取输入。
格式字符串由空白字符（格式字符串中的任何空白字符消耗所有可用的连续空格字符的输入），非空白字符除了%（每个这样的格式字符串的字符占用一个相同的字符的输入）转换规范。每个转换规格的格式如下：
Original:
The format string consists of whitespace characters (any single whitespace character in the format string consumes all available consecutive whitespace characters from the input), non-whitespace characters except % (each such character in the format strings consumes exactly one identical character from the input) and conversion specifications. Each conversion specification has the following format:
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  • 介绍%字符
    Original:
    introductory % character
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  • （可选的）分配，抑制字符*。如果此选项，该功能不分配的结果转换为任何接收的参数.
    Original:
    （可选的） assignment-suppressing character *. If this option is present, the function does not assign the result of the conversion to any receiving argument.
    The text has been machine-translated via Google Translate.
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  • （可选的）整数（大于零），指定“最大字段宽度”，即，该函数被允许做由电流转换规格指定的转换时消耗的最大字符数。需要注意的是％s和％[可能导致缓冲区溢出，如果宽度不提供.
    Original:
    （可选的） integer number (greater than zero) that specifies maximum field width, that is, the maximum number of characters that the function is allowed to consume when doing the conversion specified by the current conversion specification. Note that %s and %[ may lead to buffer overflow if the width is not provided.
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  • （可选的）“长度修饰符”指定接收的参数的大小，即，实际的目标类型。这会影响转换精度和溢出规则。默认的目标类型是不同的为每次转换类型（见下表）.
    Original:
    （可选的） length modifier that specifies the size of the receiving argument, that is, the actual destination type. This affects the conversion accuracy and overflow rules. The default destination type is different for each conversion type (see table below).
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  • 转换格式说明符
    Original:
    conversion format specifier
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下面的格式说明符
Original:
The following format specifiers are available:
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Conversion
specifier 		Explanation Argument type
length modifier hh h (none) l ll j z t L
% matches literal % N/A N/A N/A N/A N/A N/A N/A N/A N/A
c matches a single character N/A N/A
char*
wchar_t*
 N/A N/A N/A N/A N/A
s matches a character string (a sequence of non-whitespace characters)
[set]
set的字符匹配一个非空的字符序列.
Original:
matches a non-empty sequence of character from set of characters.
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如果集合的第一个字符是^，然后不在​​集合中的所有字符都匹配。如果所设置的开始与]或^]然后]字符也包括进入设置.
Original:
If the first character of the set is ^, then all characters not in the set are matched. If the set begins with ] or ^] then the ] character is also included into the set.
The text has been machine-translated via Google Translate.
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d
匹配一个十进制整数..
Original:
matches a decimal integer.
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数字的格式是相同的，为strtol()参数的值10base如预期
Original:
The format of the number is the same as expected by strtol() with the value 10 for the base argument
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signed char* or unsigned char*
signed short* or unsigned short*
signed int* or unsigned int*
signed long* or unsigned long*
signed long long* or unsigned long long*
N/A
i
匹配一个十进制整数..
Original:
matches a decimal integer.
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数字的格式是相同的，为strtol()参数的值​0​base如预期
Original:
The format of the number is the same as expected by strtol() with the value ​0​ for the base argument
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u
匹配一个无符号十进制整数..
Original:
matches a unsigned decimal integer.
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数字的格式是相同的，为strtoul()参数的值​0​base如预期
Original:
The format of the number is the same as expected by strtoul() with the value ​0​ for the base argument
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o
匹配八进制整数
Original:
matches an octal integer.
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数字的格式是相同的，为strtol()参数的值8base如预期
Original:
The format of the number is the same as expected by strtol() with the value 8 for the base argument
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x
匹配的“十六进制整数..
Original:
matches an hexadecimal integer.
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数字的格式是相同的，为strtol()参数的值16base如预期
Original:
The format of the number is the same as expected by strtol() with the value 16 for the base argument
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n
返回读取的字符数，至今..
Original:
returns the number of characters read so far.
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没有输入被消耗掉。不增加分配数量。说明有抑制赋值的操作符，该行为是未定义的
Original:
No input is consumed. Does not increment the assignment count. If the specifier has assignment-suppressing operator defined, the behavior is undefined
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a, A
e, E
f, F
g, G
匹配一个浮点数
Original:
matches a floating-point number.
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数字的格式是相同的，所期望的strtof()
Original:
The format of the number is the same as expected by strtof()
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 N/A N/A
float*
double*
 N/A N/A N/A N/A
long double*
p
实现定义的字符序列定义一个指针相匹配
Original:
matches implementation defined character sequence defining a pointer.
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printf家庭功能产生相同的顺序使用%p格式说明符
Original:
printf family of functions should produce the same sequence using %p format specifier
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 N/A N/A
void**
 N/A N/A N/A N/A N/A N/A
Original:
pointer to a null-terminated character string specifying how to read the input.
格式字符串由空白字符（格式字符串中的任何空白字符消耗所有可用的连续空格字符的输入），非空白字符除了%（每个这样的格式字符串的字符占用一个相同的字符的输入）转换规范。每个转换规格的格式如下：
Original:
The format string consists of whitespace characters (any single whitespace character in the format string consumes all available consecutive whitespace characters from the input), non-whitespace characters except % (each such character in the format strings consumes exactly one identical character from the input) and conversion specifications. Each conversion specification has the following format:
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
  • 介绍%字符
    Original:
    introductory % character
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
  • （可选的）分配，抑制字符*。如果此选项，该功能不分配的结果转换为任何接收的参数.
    Original:
    （可选的） assignment-suppressing character *. If this option is present, the function does not assign the result of the conversion to any receiving argument.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
  • （可选的）整数（大于零），指定“最大字段宽度”，即，该函数被允许做由电流转换规格指定的转换时消耗的最大字符数。需要注意的是％s和％[可能导致缓冲区溢出，如果宽度不提供.
    Original:
    （可选的） integer number (greater than zero) that specifies maximum field width, that is, the maximum number of characters that the function is allowed to consume when doing the conversion specified by the current conversion specification. Note that %s and %[ may lead to buffer overflow if the width is not provided.
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
  • （可选的）“长度修饰符”指定接收的参数的大小，即，实际的目标类型。这会影响转换精度和溢出规则。默认的目标类型是不同的为每次转换类型（见下表）.
    Original:
    （可选的） length modifier that specifies the size of the receiving argument, that is, the actual destination type. This affects the conversion accuracy and overflow rules. The default destination type is different for each conversion type (see table below).
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
  • 转换格式说明符
    Original:
    conversion format specifier
    The text has been machine-translated via Google Translate.
    You can help to correct and verify the translation. Click here for instructions.
下面的格式说明符
Original:
The following format specifiers are available:
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Conversion
specifier 		Explanation Argument type
length modifier hh h (none) l ll j z t L
% matches literal % N/A N/A N/A N/A N/A N/A N/A N/A N/A
c matches a single character N/A N/A
char*
wchar_t*
 N/A N/A N/A N/A N/A
s matches a character string (a sequence of non-whitespace characters)
[set]
set的字符匹配一个非空的字符序列.
Original:
matches a non-empty sequence of character from set of characters.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
如果集合的第一个字符是^，然后不在​​集合中的所有字符都匹配。如果所设置的开始与]或^]然后]字符也包括进入设置.
Original:
If the first character of the set is ^, then all characters not in the set are matched. If the set begins with ] or ^] then the ] character is also included into the set.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
d
匹配一个十进制整数..
Original:
matches a decimal integer.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
数字的格式是相同的，为strtol()参数的值10base如预期
Original:
The format of the number is the same as expected by strtol() with the value 10 for the base argument
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
signed char* or unsigned char*
signed short* or unsigned short*
signed int* or unsigned int*
signed long* or unsigned long*
signed long long* or unsigned long long*
N/A
i
匹配一个十进制整数..
Original:
matches a decimal integer.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
数字的格式是相同的，为strtol()参数的值​0​base如预期
Original:
The format of the number is the same as expected by strtol() with the value ​0​ for the base argument
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
u
匹配一个无符号十进制整数..
Original:
matches a unsigned decimal integer.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
数字的格式是相同的，为strtoul()参数的值​0​base如预期
Original:
The format of the number is the same as expected by strtoul() with the value ​0​ for the base argument
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
o
匹配八进制整数
Original:
matches an octal integer.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
数字的格式是相同的，为strtol()参数的值8base如预期
Original:
The format of the number is the same as expected by strtol() with the value 8 for the base argument
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
x
匹配的“十六进制整数..
Original:
matches an hexadecimal integer.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
数字的格式是相同的，为strtol()参数的值16base如预期
Original:
The format of the number is the same as expected by strtol() with the value 16 for the base argument
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
n
返回读取的字符数，至今..
Original:
returns the number of characters read so far.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
没有输入被消耗掉。不增加分配数量。说明有抑制赋值的操作符，该行为是未定义的
Original:
No input is consumed. Does not increment the assignment count. If the specifier has assignment-suppressing operator defined, the behavior is undefined
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
a, A
e, E
f, F
g, G
匹配一个浮点数
Original:
matches a floating-point number.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
数字的格式是相同的，所期望的strtof()
Original:
The format of the number is the same as expected by strtof()
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
 N/A N/A
float*
double*
 N/A N/A N/A N/A
long double*
p
实现定义的字符序列定义一个指针相匹配
Original:
matches implementation defined character sequence defining a pointer.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
printf家庭功能产生相同的顺序使用%p格式说明符
Original:
printf family of functions should produce the same sequence using %p format specifier
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
 N/A N/A
void**
 N/A N/A N/A N/A N/A N/A
The text has been machine-translated via Google Translate.
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... -
接收参数
Original:
receiving arguments
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[编辑] 返回值

成功分配的接收参数，或EOF如果读取失败发生之前，先接收参数被分配数.
Original:
Number of receiving arguments successfully assigned, or EOF if read failure occurs before the first receiving argument was assigned.
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[编辑] 为例

本节是不完整的
原因: no example

[编辑] 另请参阅

（C99）
（C99）
（C99）
stdin，一个文件流或buffer
使用可变参数列表的读取格式的输入
Original:
reads formatted input from stdin, a file stream or a buffer
using variable argument list
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（函数） [edit]
得到一个字符串从一个文件流
Original:
gets a character string from a file stream
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（函数） [edit]



（C99）
打印格式化输出到stdout，文件流或缓冲区
Original:
prints formatted output to stdout, a file stream or a buffer
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（函数） [edit]
C++ documentation for scanf, fscanf, sscanf
来自“http://zh.cppreference.com/mwiki/index.php?title=c/io/fscanf&oldid=28957”