Reverse digits of an integer.
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Example1: x = 123, return 321
Example2: x = -123, return -321
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Note:
The input is assumed to be a 32-bit signed integer. Your function should return 0 when the reversed integer overflows.
1.先记录符号
2.最后检查是否溢出int的范围
- class Solution {
- public int reverse(int x) {
- boolean flag=(x>=0)?true:false;
- long data=1;
- int[] arr=new int[10];
- int index=0;
- x=Math.abs(x);
- while(x>0){
- arr[index]=x % 10;
- x=x/10;
- index++;
- }
-
- long result=0L;
- for(int i=index-1;i>=0;i--){
- result=result+arr[i]*data;
- data=data*10;
- }
- if(result>Integer.MAX_VALUE || result
- return 0;
- }
- return flag==true?(int)result:-(int)result;
- }
- }
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