Reverse Integer---反转整数

class Solution {
public:
    int reverse(int x) {
        int newX = 0;
        int sign = 1;
        int tempX = 0;
        if(x == 0)
            newX = 0;
        // 处理负数
        if(x < 0){
            sign = -1;
            x = sign * x;
        }
        while(x != 0){
            tempX = x % 10;
            newX = newX * 10 + tempX;
            x /= 10;
        }
        return sign * newX;
    }
};