leetcode atoi java_leetcode08- String to Integer (atoi)之Java版本

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于 2021-02-26 22:34:10 发布

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文章标签： leetcode atoi java

本文链接：https://blog.youkuaiyun.com/weixin_30118803/article/details/114758258

本文详细介绍了atoi函数的工作原理：从输入字符串中读取空白字符直至找到第一个非空白字符；随后读取一个可选的正负号及尽可能多的连续数字字符，并将其解释为数值。若字符串不含有效整数或为空，则不进行转换；若转换失败则返回零；若正确值超出范围，则返回INT_MAX或INT_MIN。

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Requirements for atoi:

The function first discards as many whitespace characters as necessary until the first non-whitespace character is found. Then, starting from this character, takes an optional initial plus or minus sign followed by as many numerical digits as possible, and interprets them as a numerical value.

The string can contain additional characters after those that form the integral number, which are ignored and have no effect on the behavior of this function.

If the first sequence of non-whitespace characters in str is not a valid integral number, or if no such sequence exists because either str is empty or it contains only whitespace characters, no conversion is performed.

If no valid conversion could be performed, a zero value is returned. If the correct value is out of the range of representable values, INT_MAX (2147483647) or INT_MIN (-2147483648) is returned.