Negative powers

src/MathRelated/PowerOfSquares.java

@@ -5,6 +5,7 @@ public class PowerOfSquares
     public double IntegerPower(int base, int power)
     {
 
+
         if(power == 0)
         return 1;
 

src/MathRelated/PowerOfSquaresTest.java

@@ -10,11 +10,13 @@ public class PowerOfSquaresTest extends PowerOfSquares
     @Test
     public void integerPower()
     {
-        System.out.println(IntegerPower(2,-1));
+
         assertEquals(27,IntegerPower(3,3));
         assertEquals(4,IntegerPower(2,2));
         assertEquals(1,IntegerPower(2,0));
         assertEquals(0.5 , IntegerPower(2,-1));
+        assertEquals(1,IntegerPower(2,2)*IntegerPower(2,-2));
+        assertEquals(1,IntegerPower(10,10)*IntegerPower(10,-10),0.1);
 
     }
 

src/Phonebook/PhoneNumber.java

@@ -0,0 +1,23 @@
+package Phonebook;
+
+public class PhoneNumber
+{
+    String name;
+    String number;
+    public String getNumber()
+    {
+        return number;
+    }
+
+    public String getName()
+    {
+    return name;
+    }
+
+    PhoneNumber(String num, String name)
+    {
+        this.number = num;
+        this.name = name;
+    }
+
+}

src/Phonebook/Phonebook.java

@@ -0,0 +1,59 @@
+package Phonebook;
+
+
+import java.util.Stack;
+
+public class Phonebook
+{
+    public Stack<PhoneNumber> Numbers = new Stack<PhoneNumber>();
+
+    public boolean insert(String phoneNum, String name)
+    {
+        //check not start with 0 or 1
+        if (phoneNum.charAt(0) == '0' || phoneNum.charAt(0) == '1')
+            return false;
+
+        if (phoneNum.length() == 10)
+            return false;
+
+        PhoneNumber[] listofNums = Numbers.toArray(new PhoneNumber[0]);
+        for (int i = 0; i < listofNums.length; i++)
+        {
+
+            String check = listofNums[i].getNumber();
+            if (phoneNum.equals(check))
+                return false;
+        }
+        PhoneNumber toInsert = new PhoneNumber(phoneNum, name);
+        Numbers.push(toInsert);
+        return true;
+
+    }
+
+    public String getPhoneNumber(String name)
+    {
+        PhoneNumber[] listofNums = Numbers.toArray(new PhoneNumber[Numbers.size()]);
+        for (int i = 0; i < listofNums.length; i++)
+        {
+
+            String check = listofNums[i].getName();
+            if (name.equals(check))
+                return listofNums[i].getNumber();
+        }
+        return null;
+    }
+
+    public String getName(String num)
+    {
+        PhoneNumber[] listofNums = Numbers.toArray(new PhoneNumber[Numbers.size()]);
+        for (int i = 0; i < listofNums.length; i++)
+        {
+
+            String check = listofNums[i].getNumber();
+            if (num.equals(check))
+                return listofNums[i].getName();
+        }
+        return null;
+    }
+}
+

src/Phonebook/PhonebookTest.java

@@ -0,0 +1,39 @@
+package Phonebook;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class PhonebookTest
+{
+
+    @Test
+    public void insert()
+    {
+        PhoneNumber n1 = new PhoneNumber("81011111111","Medhat");
+        Phonebook testBook = new Phonebook();
+        assertTrue(testBook.insert(n1.getNumber(),n1.getNumber()));
+        assertFalse(testBook.insert("1000000","hmm"));
+        assertFalse(testBook.insert("000565656565656565656","Nm"));
+        assertFalse(testBook.insert("2310456789","Nope"));
+        assertFalse(testBook.insert(n1.getNumber(),n1.getNumber()));
+    }
+
+    @Test
+    public void getPhoneNumber()
+    {
+        Phonebook testBook = new Phonebook();
+        testBook.insert("71023748927398", "Jeff");
+        String name = "Jeff";
+        assertEquals(name, testBook.getName("71023748927398"));
+
+    }
+
+    @Test
+    public void getName()
+    {
+        Phonebook testBook = new Phonebook();
+        testBook.insert("810789987","Hamada");
+        assertEquals("810789987", testBook.getPhoneNumber("Hamada"));
+    }
+}

src/Phonebook/YellowPages.java

@@ -0,0 +1,28 @@
+package Phonebook;
+
+public class YellowPages extends Phonebook
+{
+    public int TotalNumbers()
+    {
+        return Numbers.size();
+    }
+    public double percentage810()
+    {
+        double percentage;
+        double total = 0;
+        PhoneNumber[] listofNums = Numbers.toArray(new PhoneNumber[Numbers.size()]);
+        for (int i = 0; i < listofNums.length; i++)
+        {
+            String check = listofNums[i].getNumber();
+            if (check.startsWith("810"))
+                total++;
+        }
+        double size = Numbers.size();
+        percentage = 100*total/size;
+
+        return percentage;
+    }
+
+
+
+}

src/Phonebook/YellowPagesTest.java

@@ -0,0 +1,31 @@
+package Phonebook;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class YellowPagesTest
+{
+
+    @Test
+    public void totalNumbers()
+    {
+        YellowPages testPage = new YellowPages();
+        testPage.insert("8105464654654678","Jeff");
+        testPage.insert("81078979878974","Jefferson");
+        testPage.insert("8104654654654654","Jeffery");
+        testPage.insert("81265464654654654","Jef");
+        assertEquals(4,testPage.TotalNumbers());
+    }
+
+    @Test
+    public void percentage810()
+    {
+        YellowPages testPage = new YellowPages();
+        testPage.insert("8105464654654678","Jeff");
+        testPage.insert("81078979878974","Jefferson");
+        testPage.insert("8104654654654654","Jeffery");
+        testPage.insert("81265464654654654","Jef");
+        assertEquals(75.0,testPage.percentage810(),0.1);
+    }
+}