diff --git a/ch01/Hello.java b/ch01/Hello.java
index 593557b..cf4a2ec 100644
--- a/ch01/Hello.java
+++ b/ch01/Hello.java
@@ -3,6 +3,7 @@ public class Hello {
     public static void main(String[] args) {
         // generate some simple output
         System.out.println("Hello, World!");
+        System.out.print(" How are you?") // an extra line I added
     }
 
 }
diff --git a/ch02/Date b/ch02/Date
new file mode 100644
index 0000000..66ea90b
--- /dev/null
+++ b/ch02/Date
@@ -0,0 +1,18 @@
+public class Date {
+    public static void main(String[] args) {
+        System.out.println("Hello, world!");
+     String day;
+     int date;
+     String month;
+     int year;
+     day = "Friday";
+     date = 13;
+     month = "May";
+     year = 2016;
+     
+     System.out.println(day);
+     System.out.println(date);
+     System.out.println(month);
+     System.out.println(year);
+    }
+}
diff --git a/ch02/Time b/ch02/Time
new file mode 100644
index 0000000..0936300
--- /dev/null
+++ b/ch02/Time
@@ -0,0 +1,23 @@
+public class Time {
+    public static void main(String[] args) {
+    double hour;
+    double minute;
+    double second;
+    hour = 19.0;
+    minute = 44.0;
+    second = 40.0;
+    System.out.println("Number of seconds since midnight:");
+    System.out.println((hour * 60) * 60 + (minute * 60) + second);
+double secondsSinceMidnight;
+secondsSinceMidnight = ((hour * 60) * 60 + (minute * 60) + second);
+    System.out.println("Number of seconds remaining in the day:");
+int secondsInTheDay;
+secondsInTheDay = ((24 * 60) * 60); 
+    System.out.println(secondsInTheDay - secondsSinceMidnight);
+    System.out.println("Percentage of the day that has passed:");
+    System.out.println((secondsSinceMidnight * 100) / secondsInTheDay);
+    System.out.println("Time elapsed since I started working on this (seconds)");
+    System.out.println(secondsSinceMidnight - 69630);
+  
+    }
+}
diff --git a/ch02/Variables.java b/ch02/Variables.java
index a295abf..3a9f77d 100644
--- a/ch02/Variables.java
+++ b/ch02/Variables.java
@@ -78,6 +78,7 @@ public static void main(String[] args) {
 
         hour = minute + 1;  // correct
         // minute + 1 = hour;  // compiler error
+    
     }
 
 }
diff --git a/ch03/ConvertTemp b/ch03/ConvertTemp
new file mode 100644
index 0000000..ae94c73
--- /dev/null
+++ b/ch03/ConvertTemp
@@ -0,0 +1,24 @@
+import java.util.Scanner;
+
+/**
+ * Converts Celsius to Fahrenheit
+ */
+public class Convert {
+
+    public static void main(String[] args) {
+        double Celsius;
+        double Fahrenheit;
+        final double FAHRENHEIT_PER_CELSIUS = 33.8;
+        Scanner in = new Scanner(System.in);
+
+        // prompt the user and get the value
+        System.out.print("Exactly how many degrees Celsius? ");
+        Celsius = in.nextDouble();
+
+        // convert and output the result
+        Fahrenheit = (double) (Celsius * FAHRENHEIT_PER_CELSIUS);
+              System.out.printf("%.1f C = %.1f F",
+                          Celsius, Fahrenheit);
+    }
+
+}
diff --git a/ch03/ConvertTime b/ch03/ConvertTime
new file mode 100644
index 0000000..502dc3b
--- /dev/null
+++ b/ch03/ConvertTime
@@ -0,0 +1,26 @@
+import java.util.Scanner;
+
+/**
+ * Converts seconnds to hours, minutes, and seconds
+ */
+public class Convert {
+
+    public static void main(String[] args) {
+        int seconds, hours, minutes, remainder;
+        final int SECONDS_PER_HOUR = 3600;
+        final int SECONDS_PER_MINUTE = 60;
+        Scanner in = new Scanner(System.in);
+
+        // prompt the user and get the value
+        System.out.print("Exactly how many seconds? ");
+        seconds = in.nextInt();
+
+        // convert and output the result
+        hours = (int) (seconds / SECONDS_PER_HOUR);
+        minutes = ((seconds % SECONDS_PER_HOUR) / SECONDS_PER_MINUTE);
+        remainder = minutes % SECONDS_PER_MINUTE;
+              System.out.printf("%d seconds = %d hours, %d minutes, %d seconds",
+                          seconds, hours, minutes, remainder);
+    }
+
+}
diff --git a/ch03/GuessNumber b/ch03/GuessNumber
new file mode 100644
index 0000000..aed0399
--- /dev/null
+++ b/ch03/GuessNumber
@@ -0,0 +1,33 @@
+import java.util.Scanner;
+import java.util.Random;
+
+/**
+ * Starter code for the "Guess My Number" exercise.
+ */
+public class Guess {
+
+    public static void main(String[] args) {
+        
+        // prompt the user and get the value
+        System.out.println("I'm thinking of a number between 1 and 100 (including both).");
+        System.out.println("Can you guess what it is?");
+        System.out.print("Type a number:");
+                           
+        Scanner in = new Scanner(System.in);
+        int guess, remainder;
+        guess = in.nextInt();
+        
+        // pick a random number
+        Random random = new Random();
+        int number = random.nextInt(100) + 1;
+        System.out.print("The number I was thinking of is: ");
+        System.out.printf("%d\n",
+                          number);
+        remainder = guess - number;
+        System.out.print("You were off by: "); 
+        System.out.printf("%d",
+                          remainder);
+                          
+    }
+
+}
diff --git a/ch04/DateRevisited b/ch04/DateRevisited
new file mode 100644
index 0000000..1f2bf34
--- /dev/null
+++ b/ch04/DateRevisited
@@ -0,0 +1,30 @@
+public class DateRevisited {
+    public static void main(String[] args) {
+     
+     String day;
+     int date;
+     String month;
+     int year;
+     day = "Friday";
+     date = 20;
+     month = "May";
+     year = 2016;
+     
+     printAmerican (day, month, date, year);
+    }
+    
+    public static void printEuropean(String day, int date, String month, int year) {
+        System.out.print(day);
+        System.out.print(", " + date);
+        System.out.print(", " + month);
+        System.out.print(", " + year);
+    }
+    
+    public static void printAmerican(String day, String month, int date, int year) {
+        System.out.print(day);
+        System.out.print(", " + month);
+        System.out.print(" " + date);
+        System.out.print(", " + year);
+    }
+}
+
diff --git a/ch04/Methods.java b/ch04/Methods.java
index 90c1b7a..75bfc2d 100644
--- a/ch04/Methods.java
+++ b/ch04/Methods.java
@@ -18,5 +18,10 @@ public static void main(String[] args) {
         double x3 = Math.exp(Math.log(10.0));
         double x4 = Math.pow(2.0, 10.0);
     }
-
+public static void zool(int a, String b, String c) {
+       System.out.println(a);
+       System.out.println(b);
+       System.out.println(c);
+    }
+           
 }
diff --git a/ch05/GuessNumberRevisited b/ch05/GuessNumberRevisited
new file mode 100644
index 0000000..0936d08
--- /dev/null
+++ b/ch05/GuessNumberRevisited
@@ -0,0 +1,65 @@
+import java.util.Scanner;
+import java.util.Random;
+
+/**
+ * Starter code for the "Guess My Number" exercise.
+ */
+public class Guess {
+        
+    public static void main(String[] args) {
+            // prompt the user and get the value
+        System.out.println("I'm thinking of a number between 1 and 100 (including both).");
+        System.out.println("Can you guess what it is?");
+        System.out.print("Type a number:");
+                           
+        Scanner in = new Scanner(System.in);
+        int guess;
+        guess = in.nextInt();
+        
+        // pick a random number
+        Random random = new Random();
+        int number = random.nextInt(100) + 1;
+        System.out.print("The number I was thinking of is: ");
+        System.out.printf("%d\n",
+                          number);
+        
+        // prompt the user and re-run guessAgain until user guesses correctly
+        if (guess == number) {
+            System.out.print("You guessed correctly.\n");
+        } else if (guess > number) {
+            System.out.print("You guessed too high. Try again.\n");
+            guessAgain(guess, number);
+        } else if (guess < number) {
+            System.out.print("You guessed too low. Try again.\n");
+            guessAgain(guess, number);
+        }                      
+    }
+
+    public static void guessAgain(int guess, int number) {
+    // prompt the user and get the value
+        System.out.println("I'm thinking of a number between 1 and 100 (including both).");
+        System.out.println("Can you guess what it is?");
+        System.out.print("Type a number:");
+                           
+        Scanner in = new Scanner(System.in);
+        guess = in.nextInt();
+        
+        // pick a random number
+        Random random = new Random();
+        System.out.print("The number I was thinking of is: ");
+        System.out.printf("%d\n",
+                          number);
+        
+        // prompt the user and re-run guessAgain until user guesses correctly
+        if (guess == number) {
+            System.out.print("You guessed correctly.\n");
+        } else if (guess > number) {
+            System.out.print("You guessed too high. Try again.\n");
+            guessAgain(guess, number);
+        } else if (guess < number) {
+            System.out.print("You guessed too low. Try again.\n");
+            guessAgain(guess, number);
+        }                      
+
+    }
+}
diff --git a/ch05/beerBottles b/ch05/beerBottles
new file mode 100644
index 0000000..f8de099
--- /dev/null
+++ b/ch05/beerBottles
@@ -0,0 +1,22 @@
+public class beerBottles {
+    
+    public static void main(String[] args) {
+        int n;
+        n = 3;
+        beerBottles(n);
+    }
+        public static void beerBottles(int n) {
+            if (n >= 1) {
+                System.out.println(n + " bottles of beer on the wall,");
+                System.out.println(n + " bottles of beer,");
+                System.out.println("ya take one down, ya' pass it around,");
+                System.out.println(n + " bottles of beer on the wall.\n");                  
+                beerBottles(n - 1);
+            } else {
+                System.out.println("No bottles of beer on the wall,");
+                System.out.println("No bottles of beer,");
+                System.out.println("ya take one down, ya' pass it around,");
+                System.out.println("No bottles of beer on the wall.");   
+            }
+        }
+    }
diff --git a/ch05/testFermat b/ch05/testFermat
new file mode 100644
index 0000000..7841dcd
--- /dev/null
+++ b/ch05/testFermat
@@ -0,0 +1,25 @@
+public class testFermat {
+    
+public static void main(String[] args) {
+        int a; 
+        int b;
+        int c;
+        int n;
+        a = 3;
+        b = 4;
+        c = 5;
+        n = 2;
+        testFermat(a, b, c, n);
+}
+
+public static void testFermat(int a, int b, int c, int n) {
+        if (((Math.pow(a, n) + Math.pow(b, n)) == Math.pow(c, n)) && (n > 2)) { 
+        System.out.println("Holy smokes! Fermat was wrong!");
+        } else {
+            System.out.println("No that doesn't work");
+     }
+    }
+
+
+}
+
diff --git a/ch06/ExerciseCh6 b/ch06/ExerciseCh6
new file mode 100644
index 0000000..397c0de
--- /dev/null
+++ b/ch06/ExerciseCh6
@@ -0,0 +1,19 @@
+public class ExerciseCh6 {
+    
+    public static void main(String[] args) {
+        int n = 5;
+        oddSum(n);
+        System.out.println("The sum of integers from 1 to n is " + oddSum(n));
+    }
+    
+    public static int oddSum(int n) {
+        if (n == 0) {
+            return 0;
+        } else if
+            (n % 2 != 0) {
+        return n + oddSum(n - 1);
+        } else {
+        return oddSum(n - 1);
+    }
+}
+}
diff --git a/ch06/VoidMethods b/ch06/VoidMethods
new file mode 100644
index 0000000..a481050
--- /dev/null
+++ b/ch06/VoidMethods
@@ -0,0 +1,27 @@
+public class voidmethods {
+    
+    public static void main(String[] args) {
+        int a = 10;
+        int b = 2;
+        int c = 7;
+        isTriangle(a, b, c);
+    }
+    
+    public static boolean isTriangle(int a, int b, int c) {
+        if ((a + b) < c) {
+            System.out.print("False");
+            return false;
+        } else if
+            ((a + c) < b) {
+            System.out.print("False");
+            return false;
+        } else if
+            ((b + c < a)) {
+            System.out.print("False");
+            return false;
+        }
+            System.out.print("True");
+            return true;
+        }
+    }
+