Peer review

AvgOfThree/package.bluej

@@ -2,9 +2,9 @@
 objectbench.height=100
 objectbench.width=658
 package.editor.height=400
-package.editor.width=560
-package.editor.x=30
-package.editor.y=30
+package.editor.width=865
+package.editor.x=860
+package.editor.y=20
 package.numDependencies=0
 package.numTargets=1
 package.showExtends=true
@@ -16,8 +16,8 @@ readme.editor.x=0
 readme.editor.y=22
 target1.editor.height=700
 target1.editor.width=900
-target1.editor.x=70
-target1.editor.y=50
+target1.editor.x=732
+target1.editor.y=309
 target1.height=50
 target1.name=AvgOfThree
 target1.naviview.expanded=false

Chapter 4 practice/Annuity.java

@@ -0,0 +1,39 @@
+
+
+/**
+ * Write a description of class Annuity here.
+ * 
+ * @author (your name) 
+ * @version (a version number or a date)
+ */
+public class Annuity
+{
+    private double PMT = 10000;
+    private double i = .08;
+    private double n = 20;
+    /**
+     * Default constructor for objects of class Annuity
+     */
+    public Annuity()
+    {
+        // initialise instance variables
+        int presentValue = 0 ;
+    }
+
+    /**
+     * An example of a method - replace this comment with your own
+     *    that describes the operation of the method
+     *
+     * @pre        preconditions for the method
+     *            (what the method assumes about the method's parameters and class's state)
+     * @post    postconditions for the method(what the method guarantees upon completion)
+     * @param    y    description of parameter y
+     * @return    description of the return value
+     */
+    public void sampleMethod()
+    {
+       double presentValue = PMT * ((((Math.pow(1+i,n-1)-1)/i)/Math.pow(1+n,n-1))+1);
+       System.out.println(presentValue);
+    }
+
+}

Chapter 4 practice/README.TXT

@@ -0,0 +1,13 @@
+------------------------------------------------------------------------
+This is the project README file. Here, you should describe your project.
+Tell the reader (someone who does not know anything about this project)
+all she needs to know. The comments should usually include at least:
+------------------------------------------------------------------------
+
+PROJECT TITLE:
+PURPOSE OF PROJECT:
+VERSION or DATE:
+DEPENDENCIES:
+HOW TO START THIS PROJECT:
+AUTHORS:
+USER INSTRUCTIONS:

Chapter 4 practice/StringParsing.java

@@ -0,0 +1,36 @@
+import java.util.Scanner;
+
+/**
+ * Write a description of class StringParsing here.
+ * 
+ * @author (your name) 
+ * @version (a version number or a date)
+ */
+public class StringParsing
+{
+    /** description of instance variable x (add comment for each instance variable) */
+    private int x;
+
+    /**
+     * Default constructor for objects of class StringParsing
+     */
+    public StringParsing()
+    {
+        // initialise instance variables
+        x = 0;
+    }
+
+    public void main()
+    {
+        Scanner in = new Scanner(System.in);
+        System.out.print("please imput a number between 1,000 and 999,999:\t");
+        String rawNumber = in.next();
+        int rawLength = rawNumber.length();
+        int commaIndex = rawNumber.indexOf(",");
+        String firstHalf = rawNumber.substring(0,commaIndex);
+        String seccondHalf = rawNumber.substring(commaIndex+1);
+        String number = firstHalf + seccondHalf;
+        System.out.println(number);
+    }
+
+}

Chapter 4 practice/package.bluej

@@ -0,0 +1,50 @@
+#BlueJ package file
+objectbench.height=76
+objectbench.width=658
+package.editor.height=400
+package.editor.width=560
+package.editor.x=860
+package.editor.y=20
+package.numDependencies=0
+package.numTargets=3
+package.showExtends=true
+package.showUses=true
+project.charset=UTF-8
+target1.editor.height=1010
+target1.editor.width=840
+target1.editor.x=840
+target1.editor.y=0
+target1.height=50
+target1.name=rectangle
+target1.naviview.expanded=true
+target1.showInterface=false
+target1.type=ClassTarget
+target1.typeParameters=
+target1.width=80
+target1.x=160
+target1.y=10
+target2.editor.height=700
+target2.editor.width=900
+target2.editor.x=861
+target2.editor.y=341
+target2.height=50
+target2.name=StringParsing
+target2.showInterface=false
+target2.type=ClassTarget
+target2.typeParameters=
+target2.width=100
+target2.x=70
+target2.y=70
+target3.editor.height=700
+target3.editor.width=900
+target3.editor.x=628
+target3.editor.y=508
+target3.height=50
+target3.name=Annuity
+target3.naviview.expanded=true
+target3.showInterface=false
+target3.type=ClassTarget
+target3.typeParameters=
+target3.width=80
+target3.x=70
+target3.y=10

Chapter 4 practice/rectangle.java

@@ -0,0 +1,40 @@
+import java.util.Scanner;
+/**
+ * like a square, but not... square
+ * 
+ * @author arash
+ * @version (a version number or a date)
+ */
+public class rectangle
+{
+    /** description of instance variable x (add comment for each instance variable) */
+    private int x;
+
+    /**
+     * Default constructor for objects of class rectangle
+     */
+    public rectangle()
+    {
+        // initialise instance variables
+        x = 0;
+    }
+
+    public void main()
+    {
+        Scanner in = new Scanner(System.in);
+        System.out.print("what is the lenght? \t:");
+        double length = in.nextDouble();
+        System.out.print("what is the width \t:");
+        double width = in.nextDouble();
+        double area = length*width;
+        double perimeter = 2*length + 2*width;
+        double diagonal = Math.sqrt((Math.pow(length,2)+Math.pow(width,2)));
+        System.out.print("\nthe area is\t:");
+        System.out.println(area);
+        System.out.print("the perimeter is\t:");
+        System.out.println(perimeter);
+        System.out.print("the diagonal is\t:");
+        System.out.println(diagonal);
+    }
+
+}

Chapter3Practice/Car.java

@@ -0,0 +1,69 @@
+
+
+/**
+ * A cool hot hip young class 
+ * tracks fuel remaining in the car as it is driven based
+ * on feul efficiencey
+ * 
+ * @Arresh 
+ * @version 12 september
+ */
+public class Car
+{
+    /** the fuel efficiency of this car measured in miles per gallon*/
+    private double fuelEfficiency;
+    /**the number of gallons of fuel left in the tank*/
+    private double fuelInTank;
+
+    /**
+     * Default constructor for a Car of specified fuel efficiency
+     */
+    public Car(double efficiency)
+    {
+        this.fuelEfficiency = efficiency;
+        this.fuelInTank = 0;
+    }
+
+    /**
+     * Adds the specofoed number of gallons of fuel to this car's tank
+     *
+     * @pre        the specified number of gallons does not excede this cars gass capacity8
+     * @param    gallons    number of gallons of fuel to add to this car's tank
+     */
+    public void addGas(double gallons)
+    {
+        this.fuelInTank =this.fuelInTank + gallons;
+
+    }
+
+
+    /**
+     * Updates fuel in this car's tank based on the specified number of miles driven 
+     * and this car's fuel efficiency
+     *
+     * @pre     Specified number of miles does not exceed the fuel in this car's tank
+     * @post    postconditions for the method
+     *          (what the method guarantees upon completion)
+     * @param   miles   number of miles this car has driven
+     */
+    public void drive(double miles)
+    {
+        double gallonsBurned = miles/ this.fuelEfficiency;
+        this.fuelInTank = this.fuelInTank - gallonsBurned;
+
+    }
+
+    /**
+     * returns number of gallons of fuel left in this car's tank
+     *
+     * @return's number of gallons of fuel left in this car's tank
+     */
+    public double getGasInTank()
+    {
+        // put your code here
+        return this.fuelInTank;
+    }
+
+
+
+}

Chapter3Practice/CarTest.java

@@ -0,0 +1,82 @@
+
+
+import static org.junit.Assert.*;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Write a description of test class CarTest here.
+ * 
+ * @author (your name) 
+ * @version (a version number or a date)
+ */
+public class CarTest
+{
+    /** description of instance variable x (add comment for each instance variable) */
+    private int x;
+
+    /**
+     * Default constructor for objects of class CarTest
+     */
+    public CarTest()
+    {
+        // initialise instance variables
+        x = 0;
+    }
+
+    /**
+     * Sets up the test fixture.
+     *
+     * Called before every test case method.
+     */
+    @Before
+    public void setUp()
+    {
+    }
+
+    /**
+     * Tears down the test fixture.
+     *
+     * Called after every test case method.
+     */
+    @After
+    public void tearDown()
+    {
+    }
+
+    @Test
+    public void testGetGasInTank()
+    {
+        Car testCar = new Car(50);
+        double gallons = testCar.getGasInTank();
+        assertEquals(0.0, gallons, 1e-6);
+    }
+
+    @Test
+    public void testAddGas()
+    {
+        Car testCar = new Car(50);
+        testCar.addGas(20);
+        double gallons = testCar.getGasInTank();
+        assertEquals(20.0, gallons, 1e-6);
+
+        testCar.addGas(5);
+        gallons = testCar.getGasInTank();
+        assertEquals(25.0, gallons, 1e-6);
+    }
+
+    @Test
+    public void testDrive()
+    {
+        Car testCar = new Car(50);
+        testCar.addGas(20);
+        testCar.drive(25);
+        double gallons = testCar.getGasInTank();
+        assertEquals(19.5, gallons, 1e-6);
+
+        testCar.drive(100);
+        gallons = testCar.getGasInTank();
+        assertEquals(17.5, gallons, 1e-6);
+    }
+}