7. Reverse Integer

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

Note: Assume we are dealing with an environment that 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.

Example 1:

Input: x = 123
Output: 321

Example 2:

Input: x = -123
Output: -321

Example 3:

Input: x = 120
Output: 21

Example 4:

Input: x = 0
Output: 0

Constraints:

• -231 <= x <= 231 - 1

# @lc code=start
using LeetCode

function reverse_integer(x::Int32)::Int
    s = sign(x)
    r = parse(Int, reverse(string(s * x)))
    return r <= typemax(Int32) ? s * r : 0
end
# @lc code=end

reverse_integer (generic function with 1 method)

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