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import java.util.Scanner;
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public class Git {
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// 将任意进制字符串转换为十进制整数
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public static int toDecimal(String number, int base) {
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int decimal = 0;
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int power = 0;
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// 从字符串的末尾开始处理
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for (int i = number.length() - 1; i >= 0; i--) {
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char digit = number.charAt(i);
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// 如果是数字字符（0-9）
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if (Character.isDigit(digit)) {
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int value = Character.getNumericValue(digit);
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decimal += value * Math.pow(base, power);
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}
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// 如果是字母字符（A-F 或 a-f），表示10-15
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else if (Character.isLetter(digit)) {
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char upperDigit = Character.toUpperCase(digit);
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int value = upperDigit - 'A' + 10;
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decimal += value * Math.pow(base, power);
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} else {
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throw new IllegalArgumentException("Invalid character in number: " + digit);
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}
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power++;
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}
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return decimal;
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}
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// 将十进制整数转换为任意进制字符串
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public static String fromDecimal(int number, int base) {
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if (number == 0) {
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return "0";
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}
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StringBuilder result = new StringBuilder();
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char[] digits = "0123456789ABCDEF".toCharArray(); // 支持到16进制
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boolean isNegative = number < 0;
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if (isNegative) {
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number = -number;
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}
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while (number > 0) {
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int remainder = number % base;
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result.insert(0, digits[remainder]);
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number /= base;
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}
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if (isNegative) {
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result.insert(0, '-');
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}
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return result.toString();
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}
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public static void main(String[] args) {
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Scanner scanner = new Scanner(System.in);
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System.out.print("请输入源进制（2-16）：");
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int sourceBase = scanner.nextInt();
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scanner.nextLine(); // 消耗掉换行符
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System.out.print("请输入目标进制（2-16）：");
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int targetBase = scanner.nextInt();
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scanner.nextLine(); // 消耗掉换行符
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System.out.print("请输入要转换的" + sourceBase + "进制数字：");
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String number = scanner.nextLine().trim(); // 读取实际的数字输入
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// 验证源进制数字是否有效
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for (char c : number.toCharArray()) {
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if (!Character.isDigit(c) && !(Character.isLetter(c) && (Character.toUpperCase(c) >= 'A' && Character.toUpperCase(c) <= 'F') && sourceBase > 10)) {
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throw new IllegalArgumentException("Invalid character in source base number: " + c);
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}
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}
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// 将源进制数字转换为十进制
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int decimalNumber = toDecimal(number, sourceBase);
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// 将十进制数字转换为目标进制
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String convertedNumber = fromDecimal(decimalNumber, targetBase);
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System.out.println("转换后的" + targetBase + "进制数字是：" + convertedNumber);
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scanner.close();
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}
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}
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