标签:des com http blog style class div img code c java
Reverse digits of an integer.
Example1: x = 123, return
321
Example2: x = -123, return -321
Have you thought about this?
Here are some good questions to ask before coding. Bonus points for you if you have already thought through this!
If the integer‘s last digit is 0, what should the output be? ie, cases such as 10, 100.
Did you notice that the reversed integer might overflow? Assume the input is a 32-bit integer, then the reverse of 1000000003 overflows. How should you handle such cases?
Throw an exception? Good, but what if throwing an exception is not an option? You would then have to re-design the function (ie, add an extra parameter).
1 public int reverse(int x) { 2 int right = 0, newInt = 0; 3 boolean flag = false; 4 if(x<0) 5 flag = true; 6 while(x!=0){ 7 right = x%10; 8 newInt = newInt*10+right; 9 x/=10; 10 } 11 // if(newInt<0) 12 // return -1; 13 if(flag == true) 14 return newInt; 15 else 16 if(newInt<0) 17 return -1; 18 return newInt; 19 }
Reverse Integer,布布扣,bubuko.com
标签:des com http blog style class div img code c java
原文地址:http://www.cnblogs.com/Altaszzz/p/3701096.html