v2

computer/computer.iml

@@ -3,6 +3,7 @@
   <component name="NewModuleRootManager" inherit-compiler-output="true">
     <exclude-output />
     <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
     </content>
     <orderEntry type="inheritedJdk" />

computer/computer.java

@@ -33,7 +33,34 @@ public class computer{
         return decimal;
     }
 
+    public static String fromDecimal(int decimal, int base) {
+        if (base < 2 || base > 16) {
+            throw new IllegalArgumentException("Base must be between 2 and 16");
+        }
+
+        StringBuilder number = new StringBuilder();
+
+        // 当十进制数大于0时，持续转换
+        while (decimal > 0) {
+            int remainder = decimal % base;
+            char digit;
 
+            // 处理0-9
+            if (remainder < 10) {
+                digit = (char) ('0' + remainder);
+            }
+            // 处理10-15（A-F）
+            else {
+                digit = (char) ('A' + (remainder - 10));
+            }
+
+            number.insert(0, digit); // 在字符串的开头插入新的字符
+            decimal /= base; // 更新十进制数，去掉已转换的部分
+        }
+
+        // 如果转换后的字符串为空（即输入的十进制数为0），则返回"0"
+        return number.length() == 0 ? "0" : number.toString();
+    }
     public static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);