std::strtol, std::strtoll
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在头文件 <cstdlib> 中定义
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long strtol( const char *str, char **str_end, int base ); |
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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
.原文:
Interprets an integer value in a byte string pointed to by
str
.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) plus or minus sign
- (可选) prefix (
0
) indicating octal base (applies only when the base is 8) - (可选) prefix (
0x
or0X
) 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。原文:
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.。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
.原文:
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
.[编辑] 。参数。
str | - | 。 null结尾的字节串的指针进行解释。
原文: pointer to the null-terminated byte string to be interpreted |
str_end | - | 。字符指针的指针.
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base | - | 。 “基地”的解释的整数值。
原文: base of the interpreted integer value |
===。 返回值。===
- 。如果成功的话,一个整数值对应的内容
str
退货。.原文:If successful, an integer value corresponding to the contents ofstr
is returned. - 。如果没有可以进行转换,0返回.原文:If no conversion can be performed, 0 is returned.
[编辑] 。为例。
本章尚未完成 原因:暂无示例 |
[编辑] 。另请参阅。
一个字节的字符串转换为整数的值 原文: converts a byte string to an integer value (函数) | |
一个无符号整数的值转换为字节字符串 原文: converts a byte string to an unsigned integer value (函数) | |
C documentation for strtol, strtoll
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