(Java)10진법 <--> n집법 변환

10진법 --> n진법

10진법을 제외한 다른 진법들은 String으로 변환해야한다. 

public class Solution {
    public static void main(String[] args) {
        // 테스트를 위한 10진수 값 = 25
        int a = 25;

        System.out.println("10진수 -> 2진수");
        System.out.println(Integer.toBinaryString(a));
        System.out.println(Integer.toString(a,2));

        System.out.println("10진수 -> 3진수");
        System.out.println(Integer.toString(a,3));

        System.out.println("10진수 -> 4진수");
        System.out.println(Integer.toString(a,4));

        System.out.println("10진수 -> 5진수");
        System.out.println(Integer.toString(a,5));

        System.out.println("10진수 -> 6진수");
        System.out.println(Integer.toString(a,6));

        System.out.println("10진수 -> 7진수");
        System.out.println(Integer.toString(a,7));

        System.out.println("10진수 -> 8진수");
        System.out.println(Integer.toOctalString(a));
        System.out.println(Integer.toString(a,8));

        System.out.println("10진수 -> 16진수");
        System.out.println(Integer.toString(a,16));
        System.out.println(Integer.toHexString(a));
    }
}

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n진법 --> 10진법

public class Solution {
    public static void main(String[] args) {
        // 테스트를 위한 n진수 값 = 25
        String a = "110011";

        System.out.println("2진수 -> 10진수");
        System.out.println(Integer.parseInt(a,3));

        System.out.println("3진수 -> 10진수");
        System.out.println(Integer.parseInt(a,3));

        System.out.println("4진수 -> 10진수");
        System.out.println(Integer.parseInt(a,4));

        System.out.println("5진수 -> 10진수");
        System.out.println(Integer.parseInt(a,5));

        System.out.println("6진수 -> 10진수");
        System.out.println(Integer.parseInt(a,6));

        System.out.println("7진수 -> 10진수");
        System.out.println(Integer.parseInt(a,7));

        System.out.println("8진수 -> 10진수");
        System.out.println(Integer.parseInt(a,8));

        System.out.println("16진수 -> 10진수");;
        System.out.println(Integer.parseInt(a,16));
    }
}