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