8、 String to Integer (atoi)
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.
atoi是將字符串轉化為整形數的一個函數：char *str = "12345.67"; n = atoi(str); n=12345。
先放著。不想做
8、 String to Integer (atoi)
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