Reverse Integer

Problem Statement - link #

Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-231, 231 - 1], then return 0.

Assume the environment does not allow you to store 64-bit integers (signed or unsigned).

Examples #

Example 1:

Input: x = 123
Output: 321

Example 2:

Input: x = -123
Output: -321

Example 3:

Input: x = 120
Output: 21

Example 4:

Input: x = 0
Output: 0

Constraints #

• -2^31 <= x <= 2^31 - 1

Solutions #

class Solution {
public:
    int reverse(int x) {
        long res = 0;
        while(x){
            res = res*10 + x%10;
            x/=10;
        }
        if(res < INT_MIN or res > INT_MAX)
            return 0;
        else
            return (int)res;
    }
};