Eric 的小站

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输入：x = 123
2
输出：321

1
输入：x = -123
2
输出：-321

1
输入：x = 120
2
输出：21

1
输入：x = 0
2
输出：0

1
class Solution {
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public:
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     int reverse(int x) {
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        string str = to_string(x);
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        string result = "";
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        if (x>=0) {
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            for (int i = str.length() - 1; i >= 0; i--) {
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                result.push_back(str[i]);
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            }
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        }
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        else {
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            result.push_back('-');
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            for (int i = str.length() - 1; i > 0; i--) {
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                result.push_back(str[i]);
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            }
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        }
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        long int num = stoll(result);
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        if (num<INT_MIN || num>INT_MAX) { return 0; }else{
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            return (int)num;
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        }
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    }
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};