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+# 第1周作业：温度转换工具
+
+## 文件清单
+- `TemperatureConverter.java`：摄氏/华氏温度转换核心程序
+- `Helloworld.java`：基础 HelloWorld 示例
+- `README.md`：编译与运行说明
+
+## 编译命令
+打开终端，进入代码所在目录，执行：
+```bash
+javac TemperatureConverter.java Helloworld.java
diff --git a/W1-李鑫怡-202506050312/TemperatureConverter.class b/W1-李鑫怡-202506050312/TemperatureConverter.class
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+import java.util.Scanner;
+
+// 温度转换：摄氏(C) ↔ 华氏(F)
+public class TemperatureConverter {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        System.out.print("请输入带有符号的温度值: ");
+        String input = scanner.nextLine();
+        scanner.close();
+
+        // 空输入直接报错
+        if (input.length() < 2) {
+            System.out.println("输入格式错误");
+            return;
+        }
+
+        // 取最后一位为单位，前面为数值字符串
+        char unit = input.charAt(input.length() - 1);
+        String numStr = input.substring(0, input.length() - 1);
+
+        try {
+            double num = Double.parseDouble(numStr);
+            double result;
+            char resUnit;
+
+            if (unit == 'C' || unit == 'c') {
+                // 摄氏 → 华氏
+                result = 1.8 * num + 32;
+                resUnit = 'F';
+            } else if (unit == 'F' || unit == 'f') {
+                // 华氏 → 摄氏
+                result = (num - 32) / 1.8;
+                resUnit = 'C';
+            } else {
+                System.out.println("输入格式错误");
+                return;
+            }
+
+            // 输出保留两位小数
+            System.out.printf("转换后的温度是%.2f%c%n", result, resUnit);
+        } catch (NumberFormatException e) {
+            System.out.println("输入格式错误");
+        }
+    }
+}
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