https://leetcode.com/problems/reverse-integer/

class Solution {
public:
    int reverse(int x) {
        int y = x;
        bool neg = false;
        if(x < 0) {
            neg = true;
            y = -x;
        }

        char a[50];
        int i = 0;
        if(y==0){
            a[0]='0';
            a[1] = 0;
        }
        while (y){
            a[i++] = y%10 + 48;
            y=y/10;
        }
        a[i] = 0;

        int l = strlen(a);
        int total = 0;
        for(i = 0; i< l ; i++){
            total+=a[i] - 48;
            if(i != l-1){
                total = total * 10;
            }
        }

        if(neg){
            total = 0 - total;
        }

        return total;
    }
};