Normal Calculation of two numbers

Calculator.java

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+/*
+Write a Java program to implement a simple calculator. The program should prompt the user to enter two numbers and an 
+operator (+, -, *, or /) and then perform the corresponding operation and display the result.
+
+For example, if the user enters 4, 5, and +, the program should display 9 as the result. Similarly, if the user enters 10, 3, 
+and *, the program should display 30 as the result.
+
+Your program should handle invalid inputs gracefully, for example, if the user enters an operator that is not one of the four 
+allowed operators or if the user enters non-numeric inputs. 
+*/
+import java.util.*;
+public class Calculator {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.print("Enter 1st number: ");
+        int a = sc.nextInt();sc.nextLine();
+        System.out.print("Enter 2nd number: ");
+        int b = sc.nextInt();sc.nextLine();
+        System.out.print("Enter operator: ");
+        char op = sc.nextLine().charAt(0);
+
+        if(op == '+')
+        {
+            System.out.println(a+" "+op+" "+b+" = "+(a+b));
+        }
+        else if(op == '-')
+        {
+            System.out.println(a+" "+op+" "+b+" = "+(a-b));
+        }
+        else if(op == '*')
+        {
+            System.out.println(a+" "+op+" "+b+" = "+(a*b));
+        }
+        else if(op == '/')
+        {
+            System.out.println(a+" "+op+" "+b+" = "+(a/b));
+        }
+        else
+        {
+            System.out.println("Invalid operator");
+        }
+    }
+}