Reverse Integer

Description:

Reverse digits of an integer.

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

Code:

  int reverse(int x) {
        int p=0;
        int temp = x;
        while (temp)
        {
            temp /= 10;
            p++;
        }
        temp = 0;
        for (int i = p-1; i >= 0; i--)
        {
            // 判断溢出
            if ( temp + (x%10)*pow(10.0,i) > INT_MAX || temp + (x%10)*pow(10.0,i) < INT_MIN )
                return 0;
            temp += (x%10)*pow(10.0,i);
            x=x/10;
        }
        return temp;
    }