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].
public class Solution {
public String
convertToBase7(
int num) {
StringBuilder sb =
new StringBuilder();
StringBuilder r =
new StringBuilder();
if (num ==
0)
return "0";
if (num <
0) {
r.append(
'-');
num = -num;
}
while (num !=
0) {
sb.append((
char)(num %
7 +
'0'));
num /=
7;
}
return r.append(sb.reverse()).toString();
}
}
