7. Reverse Integer

Medium

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).

Example 1:

Input: x = 123
Output: 321

Example 2:

Input: x = -123
Output: -321

Example 3:

Input: x = 120
Output: 21

Constraints:

• -231 <= x <= 231 - 1

Solution:

class Solution {
    public int reverse(int x) {
        long res = 0;
  while(x != 0){
   res= res*10 + x%10;
   x /= 10;
  }
  if(res >= Integer.MIN_VALUE && res <= Integer.MAX_VALUE)
   return (int)res;
  else
   return 0;
    }
}