7. Reverse Integer

Reverse digits of an integer.

Example1: x = 123, return 321
Example2: x = -123, return -321

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代码：

class Solution {public:    int reverse(int x) {        if(x==INT_MIN)  return 0;        bool index=false;        if(x<0) {index=true;x=abs(x);}        double sum=0;        while(x>=10)        {            sum=sum*10+x%10;            x=x/10;        }        sum=sum*10+x;        if(sum>INT_MAX) return 0;        return index?(-1*sum):sum;            }};