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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):

The signature of the C++ function had been updated. If you still see your function signature accepts a const char * argument, please click the reload button  to reset your code definition.

注意：题目的数据真的可以，卡了好久

public class Solution {    public int myAtoi(String str) {      if(str.trim().equals(""))			return 0;		long res = 0;		int sign = 1, i = 0;		str = str.trim();		if (str.charAt(i) == '-' || str.charAt(i) == '+') {			sign = str.charAt(i) == '-'?-1:1;			i++;		}				for(;i
   
    ='0' && str.charAt(i)<='9'){								if(res*sign>=Integer.MAX_VALUE)					return Integer.MAX_VALUE;				if(res*sign<=Integer.MIN_VALUE)					return Integer.MIN_VALUE;				res = res*10+(str.charAt(i)-'0');							}else{				if(res*sign>=Integer.MAX_VALUE)					return Integer.MAX_VALUE;				if(res*sign<=Integer.MIN_VALUE)					return Integer.MIN_VALUE;				return (int)res*sign;			}						}		if(res*sign>=Integer.MAX_VALUE)			return Integer.MAX_VALUE;		if(res*sign<=Integer.MIN_VALUE)			return Integer.MIN_VALUE;		return (int)(res*sign);    }}
   

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