Reverse Integer

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Given a 32-bit signed integer, reverse digits of an integer.

Example 1:

Input: 123
Output:  321

Example 2:

Input: -123
Output: -321

Example 3:

Input: 120
Output: 21

Note:
Assume we are dealing with an environment which could only hold integers within the 32-bit signed integer range. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

没啥难度

    public int reverse(int x) {
        boolean p = true;
        if(x<0) { p = false;x=-x;}
        long res=0;int i = Integer.toString(x).length()-1;
        while(x>0) {
              res+=(x%10)*Math.pow(10, i--);
              if(res>Integer.MAX_VALUE) return 0;
              x=x/10;
        }
        return p?(int)res:-(int)res;
    }

Reverse Integer

标签：length   nbsp   long   math   hold   sed   --   environ   blog   

原文地址：http://www.cnblogs.com/swuwyb/p/7786768.html