std::strtol, std::strtoll

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C++
 
字符串库
null结尾的字符串
Original:
Null-terminated strings
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字节的字符串
多字节字符串
宽字符串
类
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Classes
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basic_string
char_traits
 
NULL结尾的字节串
功能
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Functions
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字符操作
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Character manipulation
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转换为数字格式
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Conversions to numeric formats
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atof
atoi
atol
atoll
strtol
strtoll
字符串操作
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
字符串检查
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String examination
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内存操作
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Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
杂项
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Miscellaneous
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strerror
 
Defined in header <cstdlib>
long      strtol( const char *str, char **str_end, int base );
long long strtoll( const char *str, char **str_end, int base );
 （C++11 起）
。解释一个整数值，一个字节串所指向的str.
Original:
Interprets an integer value in a byte string pointed to by str.
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Function discards any whitespace characters until first non-whitespace character is found. Then it takes as many characters as possible to form a valid base-n (where n=base) integer number representation and converts them to an integer value. The valid integer value consists of the following parts:

  • （可选的） plus or minus sign
  • （可选的） prefix (0) indicating octal base (applies only when the base is 8)
  • （可选的） prefix (0x or 0X) indicating hexadecimal base (applies only when the base is 16)
  • a sequence of digits

The set of valid digits for base-2 integer is 01, for base-3 integer is 012, and so on. For bases larger than 10, valid digits include alphabetic characters, starting from Aa for base-11 integer, to Zz for base-36 integer. The case of the characters is ignored.

。的功能设置的指针所指向的str_end指向过去的字符的最后一个字符解释。 str_end是NULL，被忽视。
Original:
The functions sets the pointer pointed to by str_end to point to the character past the last character interpreted. If str_end is NULL, it is ignored.
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。如果str是空的，或者没有预期的形式，无需转换，（如果str_end是不NULL的str）的值存储在指向的对象的str_end.
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If the str is empty or does not have the expected form, no conversion is performed, and (if str_end is not NULL) the value of str is stored in the object pointed to by str_end.
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[编辑] 。参数。

str -
。 null结尾的字节串的指针进行解释。
Original:
pointer to the null-terminated byte string to be interpreted
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str_end -
。字符指针的指针.
Original:
pointer to a pointer to character.
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base -
。 “基地”的解释的整数值。
Original:
base of the interpreted integer value
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===。 返回值。===

  • 。如果成功的话，一个整数值对应的内容str退货。.
    Original:
    If successful, an integer value corresponding to the contents of str is returned.
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  • 。如果转换的值落在相应的返回类型的范围，发生范围错误（设置errno到ERANGE）和LONG_MAX，LONG_MIN，LLONG_MAX或LLONG_MIN则返回.
    Original:
    If the converted value falls out of range of corresponding return type, a range error occurs (setting errno to ERANGE) and LONG_MAX, LONG_MIN, LLONG_MAX or LLONG_MIN is returned.
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  • 。如果没有可以进行转换，​0​返回.
    Original:
    If no conversion can be performed, ​0​ is returned.
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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。
一个字节的字符串转换为整数的值
Original:
converts a byte string to an integer value
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（函数） [edit]
一个无符号整数的值转换为字节字符串
Original:
converts a byte string to an unsigned integer value
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（函数） [edit]
C documentation for strtol, strtoll
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/string/byte/strtol&oldid=27290”