package FirstDemo;

import java.util.Scanner;

public class demo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // 输入初始进制,要转换的进制数和目标进制
        System.out.print("请输入初始进制: ");
        int sourceBase = scanner.nextInt();

        System.out.print("请输入要转换的数字: ");
        String sourceNumber = scanner.next();

        System.out.print("请输入目标进制: ");
        int targetBase = scanner.nextInt();


        int decimalValue = toDecimal(sourceNumber, sourceBase);
        String targetNumber = fromDecimal(decimalValue, targetBase);

        System.out.printf("转换成" + targetBase +"进制的结果为: %s\n", targetNumber);

        scanner.close();
    }

    // 将输入转换为10进制
    public static int toDecimal(String number, int base) {
        return Integer.parseInt(number, base);
    }

    //将转换后的10进制数转换为R进制数
    public static String fromDecimal(int number, int base) {
        StringBuilder sb = new StringBuilder();
        while (number > 0) {
            int remainder = number % base;
            // 对于大于9的数字，用字母A-F表示
            if (remainder >= 10) {
                sb.append((char) ('A' + remainder - 10));
            } else {
                sb.append(remainder);
            }
            number /= base;
        }
        return sb.reverse().toString(); //反转字符串以得到正确的顺序
    }

}