LeetCode 504. Base 7
阿新 • • 發佈:2018-12-05
Given an integer, return its base 7 string representation.
Example 1:
Input: 100
Output: "202"
Example 2:
Input: -7
Output: "-10"
Note: The input will be in range of [-1e7, 1e7].
class Solution { //水題 public: string convertToBase7(int num) { string ans; int flag=0; if(num<0) flag=1; else if(num==0) ans.insert(ans.begin(),1,'0'); num=abs(num); while(num){ ans.insert(ans.begin(),1,'0'+num%7); num/=7; } if(flag) ans.insert(ans.begin(),1,'-'); return ans; } };