leetcode/problems/src/math/Base7.java at master · KindleBooks66/leetcode · GitHub

31 lines (28 loc) · 726 Bytes

package math;

import java.util.*;

/**

* Created by gouthamvidyapradhan on 01/08/2019 Given an integer, return its base 7 string

* representation.

* <p>Example 1: Input: 100 Output: "202" Example 2: Input: -7 Output: "-10" Note: The input will be

* in range of [-1e7, 1e7].

public class Base7 {

public static void main(String[] args) {

}

public String convertToBase7(int num) {

Integer.toString(7, 7);

if (num == 0) return "0";

int q = Math.abs(num), r;

StringBuilder sb = new StringBuilder();

while (q != 0) {

r = q % 7;

sb.append(r);

q /= 7;

}

if (num < 0) {

return "-" + sb.reverse().toString();

} else return sb.reverse().toString();

}

Expand file tree