66. Plus One （计算数字加1后的结果）

Given a non-negative number represented as an array of digits, plus one to the number.

The digits are stored such that the most significant digit is at the head of the list.

public class Solution {
public int[] plusOne(int[] digits) {
int i = digits.length - 1;
while (i >= 0) {
if (digits[i] == 9) {
digits[i] = 0;
i--;
} else {
digits[i]++;
break;
}
}if(i<0){
int[] res = new int[digits.length+1];
res[0]=1;
for(int j=0;j<digits.length;j++){
res[j+1]=digits[j];
return res;
}
}return digits;
}
}