second file

src/ProjectStudy/SimpleCalculator.java

@@ -0,0 +1,55 @@
+package ProjectStudy;
+
+import java.util.Scanner;
+
+public class SimpleCalculator {
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("欢迎使用简单计算器！");
+        System.out.println("请输入第一个操作数：");
+        double num1 = scanner.nextDouble();
+
+        System.out.println("请输入操作符（+，-，*，/，%）:");
+        char operator = scanner.next().charAt(0);
+
+        System.out.println("请输入第二个操作数：");
+        double num2 = scanner.nextDouble();
+
+        double result;
+
+        switch (operator) {
+            case '+':
+                result = num1 + num2;
+                break;
+            case '-':
+                result = num1 - num2;
+                break;
+            case '*':
+                result = num1 * num2;
+                break;
+            case '/':
+                if (num2 != 0) {
+                    result = num1 / num2;
+                } else {
+                    System.out.println("错误：除数不能为零！");
+                    return;
+                }
+                break;
+            case '%':
+                if (num2 != 0 && Math.abs(num2) == (int) Math.abs(num2)) { // 检查第二个操作数是整数
+                    result = (int) num1 % (int) num2;
+                } else {
+                    System.out.println("错误：取余操作要求第二个操作数是整数！");
+                    return;
+                }
+                break;
+            default:
+                System.out.println("错误：无效的操作符！");
+                return;
+        }
+
+        System.out.println("结果是：" + result);
+    }
+}