7. Reverse Integer

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321

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Note:

The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed integer overflows.

简单题，不做解释了，直接上代码：

class Solution {    public int reverse(int x) {        long val = (long)x;        long retVal = 0;        while (val != 0){            retVal = retVal * 10 + (val%10);            val = val/10;        }        if (retVal >= Integer.MAX_VALUE||retVal <= Integer.MIN_VALUE){            return 0;        }        return (int)retVal;    }}