007 - Reverse Integer

7. Reverse Integer

Problem Statement:

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 -

Solution:

Java

public static int reverse(int x) {
  String reversed = new StringBuilder().append(Math.abs(x)).reverse().toString();
  try {
    return x < 0 ? Integer.parseInt(reversed) * -1 : Integer.parseInt(reversed);
  } catch (Exception e) {
    return 0;
  }
}

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