StringToInteger_atoi.java ( File view )

  • By issaczr 2014-10-24
  • View(s):52
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  • Point(s): 1
			// Author:   Li Long, 1988lilong@163.com
// Update:   May 9, 2014
// Source:   http://oj.leetcode.com/problems/string-to-integer-atoi/
// Analysis: http://blog.csdn.net/lilong_dream/article/details/19677643

// 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.

public class StringToInteger_atoi {

	public int atoi(String str) {

		String s = str.trim();

		if (s.length() == 0) {

			return 0;
		
}

		int INT_MAX = Integer.MAX_VALUE;
		int INT_MIN = Integer.MIN_VALUE;
		
		int sign = 1;
		int res = 0;
		
		int i = 0;
		if (s.charAt(0) == '-') {

			sign = -1;
			++i;
		
} else if (s.charAt(0) == '+') {

			++i;
		
}

		for (; i < s.length(); ++i) {

			char digit = s.charAt(i);
			if (digit >= '0' && digit <= '9') {

				if (res > INT_MAX / 10 || digit - '0' > INT_MAX - res * 10) {

					return sign == -1 ? INT_MIN : INT_MAX;
				
}

				res = res * 10 + (digit - '0');
			
} else {

				break;
			
}
		
}

		return sign * res;
	
}

	public static void main(String[] args) {

		StringToInteger_atoi slt = new StringToInteger_atoi();
		String str = "-2147483649";
		int result = slt.atoi(str);
		System.out.print(result);
	
}

}			
...
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