Implement atoi to convert a string to an integer.

Hint:Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases.

Notes:It is intended for this problem to be specified vaguely (ie, no given input specs). You are responsible to gather all the input requirements up front.

Update (2015-02-10):

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題意：

就是自己實現(xiàn)atoi，這題最坑的是越界的時候應(yīng)該返回最大或最小值max_int 與min_int，但題目中沒有提示——當(dāng)然這樣設(shè)計的一個目的可能是防止刷題人直接調(diào)用itoa函數(shù)。注意 后面有字符時，直接跳出輸出前面的數(shù)，與atoi一致。

我的做法是定義long long型，超限時break。