Leetcode
2020.04.28 06:21

# 7. Reverse Integer

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Given a 32-bit signed integer, reverse digits of an integer.

Example 1:

```Input: 123
Output: 321
```

Example 2:

```Input: -123
Output: -321
```

Example 3:

```Input: 120
Output: 21
```

Note:
Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range: [−231,  231 − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

```class Solution {
public int reverse(int x) {
int result = 0;

while (x != 0) {
int last = x % 10;
x /= 10;

if(result > Integer.MAX_VALUE/10){
return 0;
}

if(result == Integer.MAX_VALUE/10 && last > 7){
return 0;
}

if (result < Integer.MIN_VALUE/10){
return 0;
}

if(result == Integer.MIN_VALUE/10 && last < -8){
return 0;
}

result = result * 10 + last;
}
return result;
}
}
```

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