7. Reverse Integer

Reverse digits of an integer.

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

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public class Solution {
    public int reverse(int x) {
        
        boolean sign = x >=0;
　　　　 if(x < 0) x = -x;
        
        int rst = 0;
        
        while(x > 0){
            int i = x % 10;
            rst = rst * 10 + i;
            x = x / 10;
        }
        
        if(!sign)
            rst = -rst;
        
        return rst;
        
    }
}