src/com/company/Calc.java

@@ -0,0 +1,58 @@
+package com.company;
+
+
+public class Calc {
+    public static void print(String text) { //this is a small function to makes it easier to print out to terminal
+        System.out.println(text); //similar to python output
+    }
+    //math functions
+    public static double add(String num1, String num2){
+        double add1 = Double.parseDouble(num1);
+        double add2 = Double.parseDouble(num2);
+        return add1 + add2;
+    }
+    public static double sub(String num1, String num2){
+        double sub1 = Double.parseDouble(num1);
+        double sub2 = Double.parseDouble(num2);
+        return sub1 - sub2;
+    }
+    public static double mul(String num1, String num2){
+        double mul1 = Double.parseDouble(num1);
+        double mul2 = Double.parseDouble(num2);
+        return mul1 * mul2;
+    }
+
+    public static double div(String num1, String num2){
+        double div1 = Double.parseDouble(num1);
+        double div2 = Double.parseDouble(num2);
+        if (div2 == 0 || div1 == 0){
+            print("cant divide by zero");
+            print("error code:");
+            return -1;
+        }
+        return div1 / div2;
+    }
+    public static String mulRound(String num1, String num2){
+        double mul1 = Double.parseDouble(num1);
+        double mul2 = Double.parseDouble(num2);
+        return Math.round(mul1 * mul2) + "rounded";
+    }
+    public static String divRemain(String num1, String num2){
+        double div1 = Double.parseDouble(num1);
+        double div2 = Double.parseDouble(num2);
+        if (div2 == 0){
+            print("cant divide by zero");
+            print("error code:");
+            return "-1";
+        }
+        else if (div1 == 0)
+            return "0";
+        else {
+            int div1I = (int) div1;
+            int div2I = (int) div2;
+            int divT = div1I / div2I;
+            return divT + " with remainder of: " + div1 % div2;
+        }
+
+    }
+}

src/com/company/Main.java

@@ -4,65 +4,50 @@ import java.util.Scanner;
 
 public class Main {
     @SuppressWarnings("InfiniteLoopStatement")
-    public static void main(String[] args)
+    public static void main(String[] args) {
-    {
+        double total = 0;
-        while(true) {
+        String num1;
+        String num2;
+        while (true) {
             Scanner in = new Scanner(System.in);
-            print("Enter first number: ");
+            System.out.println("Enter first number: ");
-            String num1 = in.nextLine();
+            num1 = in.nextLine();
-            print("please enter second number");
+            if (num1.equals("ans") || num1.equals("total")) {
-            String num2 = in.nextLine();
+                num1 = String.valueOf(total);
-            print("Inputs complete");
+            }
-            print("Please input operator");
+            System.out.println("please enter second number");
-            print("+ , - , * or x , /");
+            num2 = in.nextLine();
+            if (num2.equals("ans") || num2.equals("total")) {
+                num2 = String.valueOf(total);
+            }
+            System.out.println("Inputs complete");
+            System.out.println("Please input operator");
+            System.out.println("+ , - , * or x , /");
+            System.out.println("'for rounded multiplication: use '*r', 'Xr' or 'xr'");
+            System.out.println("'for remainder division: use '/R' or '/r'");
             String op = in.nextLine();
 
             switch (op) {
                 case "+" -> {
-                    int total = add(num1, num2);
+                    total = Calc.add(num1, num2);
                     System.out.println(total);
                 }
                 case "-" -> {
-                    int total = sub(num1, num2);
+                    total = Calc.sub(num1, num2);
                     System.out.println(total);
                 }
                 case "*", "x" -> {
-                    int total = mul(num1, num2);
+                    total = Calc.mul(num1, num2);
                     System.out.println(total);
                 }
                 case "/" -> {
-                    int total = div(num1, num2);
+                    total = Calc.div(num1, num2);
                     System.out.println(total);
                 }
-                default -> print("Unexpected value: " + op + " ...restarting program");
+                case "*/", "xR", "xr" -> System.out.println(Calc.mulRound(num1, num2));
+                case "/R", "/r" -> System.out.println(Calc.divRemain(num1, num2));
+                default -> System.out.println("Unexpected value: '" + op + "' ...restarting program");
             }
         }
     }
-    private static void print(String text){
-        System.out.println(text);
-    }
-    private static int add(String num1, String num2){
-        int add1 = Integer.parseInt(num1);
-        int add2 = Integer.parseInt(num2);
-        return add1 + add2;
-    }
-    private static int sub(String num1, String num2){
-        int sub1 = Integer.parseInt(num1);
-        int sub2 = Integer.parseInt(num2);
-        return sub1 - sub2;
-    }
-    private static int mul(String num1, String num2){
-        int mul1 = Integer.parseInt(num1);
-        int mul2 = Integer.parseInt(num2);
-        return mul1 * mul2;
-    }
-    private static int div(String num1, String num2){
-        int div1 = Integer.parseInt(num1);
-        int div2 = Integer.parseInt(num2);
-        if (div2 == 0 || div1 == 0){
-            print("cant divide by zero");
-            return -1;
-        }
-        return div1 / div2;
-    }
 }