From fec3f27ecbfaed4159f5d253211423e59e84dcee Mon Sep 17 00:00:00 2001
From: BudBak <budbakforgit@gmail.com>
Date: Sun, 17 Nov 2019 21:43:26 +0530
Subject: [PATCH] BAEL-3506

---
 .../baeldung/maths/BasicCalculatorIfElse.java | 52 ++++++++++++++++
 .../maths/BasicCalculatorSwitchCase.java      | 62 +++++++++++++++++++
 2 files changed, 114 insertions(+)
 create mode 100644 java-numbers/src/main/java/com/baeldung/maths/BasicCalculatorIfElse.java
 create mode 100644 java-numbers/src/main/java/com/baeldung/maths/BasicCalculatorSwitchCase.java

diff --git a/java-numbers/src/main/java/com/baeldung/maths/BasicCalculatorIfElse.java b/java-numbers/src/main/java/com/baeldung/maths/BasicCalculatorIfElse.java
new file mode 100644
index 0000000000..37cac75539
--- /dev/null
+++ b/java-numbers/src/main/java/com/baeldung/maths/BasicCalculatorIfElse.java
@@ -0,0 +1,52 @@
+package com.baeldung.maths;
+
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+public class BasicCalculatorIfElse {
+
+    public static void main(String[] args) {
+
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("---------------------------------- \n" +
+                "Welcome to Basic Calculator \n" +
+                "----------------------------------");
+        System.out.println("Following operations are supported : \n" +
+                "1. Addition (+) \n" +
+                "2. Subtraction (-) \n" +
+                "3. Multiplication (* OR x) \n" +
+                "4. Division (/) \n");
+        try {
+            System.out.println("Enter an operator: (+ OR - OR * OR /) ");
+            char operation = scanner.next().charAt(0);
+
+            if (!(operation == '+' || operation == '-' || operation == '*' || operation == 'x' || operation == '/')) {
+                System.err.println("Invalid Operator. Please use only + or - or * or /");
+            }
+
+            System.out.println("Enter First Number: ");
+            double num1 = scanner.nextDouble();
+
+            System.out.println("Enter Second Number: ");
+            double num2 = scanner.nextDouble();
+
+            if (operation == '/' && num2 == 0.0) {
+                System.err.println("Second Number cannot be zero for Division operation.");
+            }
+
+            if (operation == '+') {
+                System.out.println(num1 + " + " + num2 + " = " + (num1 + num2));
+            } else if (operation == '-') {
+                System.out.println(num1 + " - " + num2 + " = " + (num1 - num2));
+            } else if (operation == '*' || operation == 'x') {
+                System.out.println(num1 + " x " + num2 + " = " + (num1 * num2));
+            } else if (operation == '/') {
+                System.out.println(num1 + " / " + num2 + " = " + (num1 / num2));
+            } else {
+                System.err.println("Invalid Operator Specified.");
+            }
+        } catch (InputMismatchException exc) {
+            System.err.println(exc.getMessage());
+        }
+    }
+} 
\ No newline at end of file
diff --git a/java-numbers/src/main/java/com/baeldung/maths/BasicCalculatorSwitchCase.java b/java-numbers/src/main/java/com/baeldung/maths/BasicCalculatorSwitchCase.java
new file mode 100644
index 0000000000..1f30f1b8c2
--- /dev/null
+++ b/java-numbers/src/main/java/com/baeldung/maths/BasicCalculatorSwitchCase.java
@@ -0,0 +1,62 @@
+package com.baeldung.maths;
+
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+public class BasicCalculatorSwitchCase {
+    public static void main(String[] args) {
+
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("---------------------------------- \n"
+            + "Welcome to Basic Calculator \n"
+            + "----------------------------------");
+        System.out.println("Following operations are supported : \n" +
+                "1. Addition (+) \n" +
+                "2. Subtraction (-) \n" +
+                "3. Multiplication (* OR x) \n" +
+                "4. Division (/) \n");
+        try {
+            System.out.println("Enter an operator: (+ OR - OR * OR /) ");
+            char operation = scanner.next().charAt(0);
+
+            if (!(operation == '+' || operation == '-' || operation == '*' || operation == 'x' || operation == '/')) {
+                System.err.println("Invalid Operator. Please use only + or - or * or /");
+            }
+
+            System.out.println("Enter First Number: ");
+            double num1 = scanner.nextDouble();
+
+            System.out.println("Enter Second Number: ");
+            double num2 = scanner.nextDouble();
+
+            if (operation == '/' && num2 == 0.0) {
+                System.err.println("Second Number cannot be zero for Division operation.");
+            }
+
+            switch (operation) {
+                case '+':
+                    System.out.println(num1 + " + " + num2 + " = " + (num1 + num2));
+                    break;
+                case '-':
+                    System.out.println(num1 + " - " + num2 + " = " + (num1 - num2));
+                    break;
+                case '*':
+                    System.out.println(num1 + " x " + num2 + " = " + (num1 * num2));
+                    break;
+                case 'x':
+                    System.out.println(num1 + " x " + num2 + " = " + (num1 * num2));
+                    break;
+                case '/':
+                    System.out.println(num1 + " / " + num2 + " = " + (num1 / num2));
+                    break;
+                default:
+                    System.err.println("Invalid Operator Specified.");
+                    break;
+            }
+        } catch (InputMismatchException exc) {
+            System.err.println(exc.getMessage());
+        }
+        scanner.close();
+    }
+}
+