Reverse digits of an integer.

Reverse digits of an integer.

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

 

class Solution {
public:
    int reverse(int x) {
        bool isPositive = true;
        if(x<0){
            isPositive = false;
            x = -x;
        }
        int y = 0;
        while(x>0){
           int tmp = x %10;
           x = x / 10;
           y = 10 * y +tmp;
        }
        if(!isPositive)
            y = -y;
         return y;
    }
};