Leetcode-Day 11

Question 1Reverse Integer

Reverse digits of an integer.

EXAMPLE1:X = 123, return 321
example2:x = -123, return-321

We need to consider a lot of cases of input. One particular example is what to deal with many zeros in the end of the.

The most direct-to-use string or char array to store the int number and then convert it. But I prefer to use the pure math-to-do it as cleaner and easier.

1  Public classSolution {2      Public intReverseintx) {3         if(x>=0 && x < 10)4             returnx;5         6         BooleanFlag =true;7         8         if(X < 0){9x = 0-x;TenFlag =false; One         } A          -         Doubleresult = 0; -          the          while(X > 0){ -             intMoD = x% 10; -result = result * 10 +MoD; -x = X/10; +         } -          +         if(flag) A             returnResult > Integer.max_value? 0: (int) result; at         Else -             return0-result < Integer.min_value? 0: (int) (0-result); -          -     } -}

Leetcode-Day 11