Cys

Git.java

@@ -0,0 +1,92 @@
+import java.util.Scanner;
+
+public class Git {
+
+    // 将任意进制字符串转换为十进制整数  
+    public static int toDecimal(String number, int base) {
+        int decimal = 0;
+        int power = 0;
+
+        // 从字符串的末尾开始处理  
+        for (int i = number.length() - 1; i >= 0; i--) {
+            char digit = number.charAt(i);
+
+            // 如果是数字字符（0-9）  
+            if (Character.isDigit(digit)) {
+                int value = Character.getNumericValue(digit);
+                decimal += value * Math.pow(base, power);
+            }
+            // 如果是字母字符（A-F 或 a-f），表示10-15  
+            else if (Character.isLetter(digit)) {
+                char upperDigit = Character.toUpperCase(digit);
+                int value = upperDigit - 'A' + 10;
+                decimal += value * Math.pow(base, power);
+            } else {
+                throw new IllegalArgumentException("Invalid character in number: " + digit);
+            }
+
+            power++;
+        }
+
+        return decimal;
+    }
+
+    // 将十进制整数转换为任意进制字符串  
+    public static String fromDecimal(int number, int base) {
+        if (number == 0) {
+            return "0";
+        }
+
+        StringBuilder result = new StringBuilder();
+        char[] digits = "0123456789ABCDEF".toCharArray(); // 支持到16进制  
+
+        boolean isNegative = number < 0;
+        if (isNegative) {
+            number = -number;
+        }
+
+        while (number > 0) {
+            int remainder = number % base;
+            result.insert(0, digits[remainder]);
+            number /= base;
+        }
+
+        if (isNegative) {
+            result.insert(0, '-');
+        }
+
+        return result.toString();
+    }
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.print("请输入源进制（2-16）：");
+        int sourceBase = scanner.nextInt();
+        scanner.nextLine(); // 消耗掉换行符
+
+        System.out.print("请输入目标进制（2-16）：");
+        int targetBase = scanner.nextInt();
+        scanner.nextLine(); // 消耗掉换行符
+
+        System.out.print("请输入要转换的" + sourceBase + "进制数字：");
+        String number = scanner.nextLine().trim(); // 读取实际的数字输入
+
+        // 验证源进制数字是否有效
+        for (char c : number.toCharArray()) {
+            if (!Character.isDigit(c) && !(Character.isLetter(c) && (Character.toUpperCase(c) >= 'A' && Character.toUpperCase(c) <= 'F') && sourceBase > 10)) {
+                throw new IllegalArgumentException("Invalid character in source base number: " + c);
+            }
+        }
+
+        // 将源进制数字转换为十进制
+        int decimalNumber = toDecimal(number, sourceBase);
+
+        // 将十进制数字转换为目标进制
+        String convertedNumber = fromDecimal(decimalNumber, targetBase);
+
+        System.out.println("转换后的" + targetBase + "进制数字是：" + convertedNumber);
+
+        scanner.close();
+    }
+}