17 lines
985 B
Markdown
17 lines
985 B
Markdown
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# String to Integer (atoi)
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## Instructions
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Implement atoi to convert a string to an integer.
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## Requirements
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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.
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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.
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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.
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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.
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