Description:
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].
Solution:
class Solution { public String convertToBase7(int num) { if(num==0){ return "0"; } int dig = 0; String result = ""; if(num>0){ result = ""; do { dig = num%7; num = num/7; result = result + dig; } while (num>0); return Reverse(result); } else{ num = -num; do { dig = num%7; num = num/7; result = result + dig; } while (num>0); result = result+"-"; return Reverse(result); } } public String Reverse(String a ){ StringBuffer sb = new StringBuffer(a); return sb.reverse().toString(); } }
原文：https://www.cnblogs.com/codingyangmao/p/11341616.html