腾讯//反转整数

给定一个 32 位有符号整数,将整数中的数字进行反转。

示例 1:

输入: 123
输出: 321

 示例 2:

输入: -123
输出: -321

示例 3:

输入: 120
输出: 21

注意:

假设我们的环境只能存储 32 位有符号整数,其数值范围是 [−231,  231 − 1]。根据这个假设,如果反转后的整数溢出,则返回 0。

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

 

posted @ 2018-10-24 09:23  strawqqhat  阅读(79)  评论(0编辑  收藏  举报
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