7. Reverse Integer

Description

Problem

Description

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 hold integers within the 32-bit signed integer range. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows. Tags: Math

解法

思路1

题意是给你一个整型数,求它的逆序整型数,而且有个小坑点,当它的逆序整型数溢出的话,那么就返回 0,用我们代码表示的话可以求得结果保存在 long 中,最后把结果和整型的两个范围比较即可。

思路1

```go func reverse(x int) int { ans := 0 for ; x != 0; x /= 10 { ans = ans*10 + x%10 }

if ans < math.MinInt32 || ans > math.MaxInt32 {
    return 0
}

return ans

}

```

结语

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