Added Calculator class

Calculator.java

@@ -0,0 +1,64 @@
+
+/**
+ * Write a description of class Calculator here.
+ *
+ * @author (your name)
+ * @version (a version number or a date)
+ */
+
+//The class is using mxparser;
+
+import org.mariuszgromada.math.mxparser.*;
+
+public class Calculator
+{
+
+
+    Double currentValue;
+    String mode;
+
+    //trig
+
+    /**
+     * Constructor for objects of class Calculator
+     */
+    public Calculator()
+    {
+        // initialise instance variables
+        currentValue=0.0;
+        //int y = 0;
+        mode ="radians";
+    }
+
+    /**
+     * An example of a method - replace this comment with your own
+     *
+     * @param  y  a sample parameter for a method
+     * @return    the sum of x and y
+     */
+    //The calc function
+    public  String calc(String toCalc)
+    {
+
+        Expression expression = new Expression(toCalc);
+
+
+        if (mXparser.checkIfDegreesMode()){
+
+          mXparser.setDegreesMode(); 
+        }
+
+        else {
+
+            mXparser.setRadiansMode(); 
+
+        }
+        currentValue=expression.calculate();
+        String result= ""+this.currentValue;
+
+        return result;
+
+
+    }
+
+}

IOConsole.java

@@ -0,0 +1,43 @@
+import java.util.Scanner;
+
+/**
+ * Write a description of class IOConsole here.
+ *
+ * @author (your name)
+ * @version (a version number or a date)
+ */
+public class IOConsole
+{
+    // instance variables - replace the example below with your own
+    //private int x;
+
+    /**
+     * Constructor for objects of class IOConsole
+     */
+    public IOConsole()
+    {
+        // initialise instance variables
+        //x = 0;
+    }
+
+    /**
+     * An example of a method - replace this comment with your own
+     *
+     * @param  y  a sample parameter for a method
+     * @return    the sum of x and y
+     */
+    public void display()
+    {
+        // put your code here
+        Calculator c= new Calculator();
+        Scanner scanner =new Scanner(System.in);
+        System.out.println("Enter your numbers and operators to calculate");
+        String s = scanner.next();
+        System.out.print(c.calc (s));
+        //System.out.print('\u000C');
+
+
+
+
+    }
+}

MainApplication.java

@@ -1,4 +1,20 @@
+
+
+
 public class MainApplication {
-    public static void main(String[] args) {
+    public static void main() {
+        System.out.print('\u000C'); // clears the display
+        Calculator c= new Calculator();
+        IOConsole io= new IOConsole();
+
+        io.display();
+
+        //System.out.println(c.calc(result));
     }
+
+
+
 }
+
+
+

Tester.java

@@ -0,0 +1,29 @@
+
+import org.junit.Test;
+import org.junit.Assert;
+
+/**
+ * The test class Tester.
+ *
+ * @author  (your name)
+ * @version (a version number or a date)
+ */
+public class Tester
+{
+    /**
+     * Default constructor for test class Tester
+     */
+    @Test
+    public void testAdd(){
+        // : Given
+        String stringAddition = "3-1";
+        String expected = "2.0";
+
+        Calculator c = new Calculator();
+
+        String actual = c.calc( stringAddition );
+
+        Assert.assertEquals(actual, expected);
+    }
+
+}

package.bluej

@@ -1,23 +1,23 @@
 #BlueJ package file
 dependency1.from=MainApplication
-dependency1.to=Console
+dependency1.to=Calculator
 dependency1.type=UsesDependency
-editor.fx.0.height=850
-editor.fx.0.width=1142
-editor.fx.0.x=568
-editor.fx.0.y=-936
-objectbench.height=214
+editor.fx.0.height=716
+editor.fx.0.width=800
+editor.fx.0.x=302
+editor.fx.0.y=-868
+objectbench.height=200
 objectbench.width=595
 package.divider.horizontal=0.6
-package.divider.vertical=0.6847360912981455
-package.editor.height=473
+package.divider.vertical=0.6854103343465046
+package.editor.height=444
 package.editor.width=493
-package.editor.x=-109
-package.editor.y=-994
-package.frame.height=759
+package.editor.x=396
+package.editor.y=133
+package.frame.height=716
 package.frame.width=619
 package.numDependencies=1
-package.numTargets=5
+package.numTargets=2
 package.showExtends=true
 package.showUses=true
 project.charset=UTF-8
@@ -27,39 +27,16 @@ readme.width=47
 readme.x=10
 readme.y=10
 target1.height=50
-target1.name=MainApplicationTest
+target1.name=Calculator
 target1.showInterface=false
-target1.type=UnitTestTargetJunit4
+target1.type=ClassTarget
 target1.width=120
-target1.x=110
-target1.y=40
-target2.association=ConsoleTest
+target1.x=60
+target1.y=190
 target2.height=50
-target2.name=Console
+target2.name=MainApplication
 target2.showInterface=false
 target2.type=ClassTarget
-target2.width=80
+target2.width=120
 target2.x=80
-target2.y=200
-target3.height=50
-target3.name=ConsoleTest
-target3.showInterface=false
-target3.type=UnitTestTargetJunit4
-target3.width=80
-target3.x=110
-target3.y=170
-target4.height=50
-target4.name=operator
-target4.showInterface=false
-target4.type=ClassTarget
-target4.width=80
-target4.x=240
-target4.y=110
-target5.association=MainApplicationTest
-target5.height=50
-target5.name=MainApplication
-target5.showInterface=false
-target5.type=ClassTarget
-target5.width=120
-target5.x=80
-target5.y=70
+target2.y=70