make it independent for data type

Calculator/Calculator.java

@@ -1,45 +1,62 @@
 import java.util.Scanner;
 
-public class Calculator {
+class Calculator {
     public static void RunCalculator(String[] args) {
         Scanner input = new Scanner(System.in);
-        double num1, num2, result;
-        char operator;
-
+
         System.out.print("Enter the first number: ");
-        num1 = input.nextDouble();
+        String firstInput = input.next();
 
         System.out.print("Enter the second number: ");
-        num2 = input.nextDouble();
-        
+        String secondInput = input.next();
+
         System.out.print("Enter an operator (+, -, *, /): ");
-        operator = input.next().charAt(0);
-
+        char operator = input.next().charAt(0);
+
+        Number num1 = parseNumber(firstInput);
+        Number num2 = parseNumber(secondInput);
+
+        if (num1 == null || num2 == null) {
+            System.out.println("Invalid input. Please enter a valid number.");
+            return;
+        }
+
+        double result;
+
         switch (operator) {
             case '+':
-                result = num1 + num2;
-                System.out.println(num1 + " + " + num2 + " = " + result);
+                result = num1.doubleValue() + num2.doubleValue();
                 break;
             case '-':
-                result = num1 - num2;
-                System.out.println(num1 + " - " + num2 + " = " + result);
+                result = num1.doubleValue() - num2.doubleValue();
                 break;
             case '*':
-                result = num1 * num2;
-                System.out.println(num1 + " * " + num2 + " = " + result);
+                result = num1.doubleValue() * num2.doubleValue();
                 break;
             case '/':
-                if (num2 == 0) {
+                if (num2.doubleValue() == 0) {
                     System.out.println("Error: Division by zero");
-                } 
-                else {
-                    result = num1 / num2;
-                    System.out.println(num1 + " / " + num2 + " = " + result);
+                    return;
                 }
+                result = num1.doubleValue() / num2.doubleValue();
                 break;
             default:
                 System.out.println("Invalid operator");
-                break;
+                return;
+        }
+
+        System.out.println(num1 + " " + operator + " " + num2 + " = " + result);
+    }
+
+    public static Number parseNumber(String input) {
+        try {
+            if (input.contains(".")) {
+                return Double.parseDouble(input);
+            } else {
+                return Integer.parseInt(input);
+            }
+        } catch (NumberFormatException e) {
+            return null;
         }
     }
 }