English
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;
}
}
...