[leetcode]504. Base 7

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].

Answer:

public String convertToBase7(int num) {
return Long.toString(Long.valueOf(num),7);
}