7. Reverse Integer
Published in
May 4, 2023
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;
}
}