题目

7. 整数反转

答案

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class Solution {
public:
    int reverse(int x) {
        int sum = 0;
        while (x != 0) {
            int temp = x % 10;
            x /= 10;
            
            if (sum > (INT_MAX / 10) || (sum == INT_MAX / 10 && temp > 7)) {
                return 0;
            }
            if (sum < (INT_MIN / 10) || (sum == INT_MIN / 10 && temp < -8)) {
                return 0;
            }
            sum = sum * 10 + temp;
        }
        return sum;
    }
};

__END__