@@ -0,0 +1,22 @@
+import java.util.Scanner;
+
+/**
+ * Converts Celsius to Fahrenheit.
+ */
+
+public class CelsiusToFahrenheit {
+    public static void main(String[] args){
+        Scanner in = new Scanner(System.in);
+
+        //prompt the user and get the value
+        System.out.print("What is the temperature in Celsius? ");
+        double celsius = in.nextDouble();
+        final double COEFFICIENT = 9.0 / 5.0;
+        final int VALUE_TO_ADD = 32;
+
+        //convert and output the result
+        double fahrenheit = celsius * COEFFICIENT + VALUE_TO_ADD;
+        System.out.printf("%.1f C = %.1f F", celsius, fahrenheit);
+    }
+
+}
@@ -0,0 +1,28 @@
+import java.util.Scanner;
+
+/**
+ * This program converts a total number of seconds
+ * to hours, minutes, and seconds.
+ */
+
+public class Convert3 {
+
+    public static void main(String[] args){
+        Scanner in = new Scanner(System.in);
+        final int SECONDS_PER_MINUTE = 60;
+        final int MINUTES_PER_HOUR = 60;
+        int hour = 0, minute = 0;
+        int second;
+
+        //prompt the user and get the value
+        System.out.print("Exactly how many seconds? ");
+        int secondInput = in.nextInt();
+
+        //convert and output the result
+        minute += secondInput / SECONDS_PER_MINUTE;
+        second = secondInput % SECONDS_PER_MINUTE;
+        hour += minute / MINUTES_PER_HOUR;
+        minute = minute % MINUTES_PER_HOUR;
+        System.out.printf("%d seconds = %d hours, %d minutes and %d seconds", secondInput, hour, minute, second);
+    }
+}
@@ -1,15 +1,33 @@
 import java.util.Random;
+import java.util.Scanner;
+import static java.lang.Math.abs;
 
 /**
- * Starter code for the "Guess My Number" exercise.
+ * "Guess My Number" exercise.
  */
 public class GuessStarter {
 
     public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+
+        System.out.println("I'm thinking of a number between 1 and 100");
+        System.out.println("(including both). Can you guess what it is?");
+
+        //prompt the user and get the value
+        System.out.print("Type a number: ");
+        int guess = in.nextInt();
+        System.out.printf("Your guess is: %d\n", guess);
+
         // 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.println(number);
+
+        //compute and display the difference between the user's guess and the number that was generated
+        System.out.printf("You were off by: %d", abs(number - guess));
+
+
     }
 
 }