Began the sentinel loop.

src/Assignments/A3/InterpolationSearch.java

@@ -48,8 +48,6 @@ public class InterpolationSearch {
             /* Checks if high is the same thing as low to prevent division by zero. */
             if (high != low) {
                 probe = low + (((key - array[low]) * (high - low)) / (array[high] - array[low]));
-
-                /* This is here due to the fact that it is not always divided as there is only 1 element left. */
                 this.divisions++;
             } else {
                 probe = high;
@@ -59,6 +57,7 @@ public class InterpolationSearch {
             if (array[high] < key || array[low] > key) {
                 break;
             }
+
             /* Checks if the key is less than the probe's value */
             if (array[probe] > key) {
                 high = probe - 1;

src/Assignments/A3/TestInterpolationSearch.java

@@ -9,6 +9,128 @@ public class TestInterpolationSearch {
     /** Holds the size of the table to generate */
     public int tableSize;
 
+    public static void main(String[] args) {
+        TestInterpolationSearch program = new TestInterpolationSearch();
+        program.start();
+    }
+
+    /**
+     * Used as the main sentential loop and loops until the exit option is selected.
+     *
+     * @precondition none
+     * @postcondition none
+     */
+    public void start() {
+        int option = this.getOption();
+        while (option != 4) {
+            this.executeOption(option);
+            option = this.getOption();
+        }
+    }
+
+    /**
+     * Displays the menu options.
+     *
+     * @precondition none
+     * @postcondition the menu is displayed.
+     */
+    private void displayMenu() {
+        System.out.println("----------------------MAIN MENU-------------------");
+        System.out.println("1. Create, populate, and display array Values[]");
+        System.out.println("2. Read output table size");
+        System.out.println("3. Run interpolation search and display outputs");
+        System.out.println("4. Exit program");
+        System.out.println();
+    }
+
+    /**
+     * Prints out the menu of options, asks for an input, and if that input is invalid it prints an error and
+     * prompts the user again for the input.
+     *
+     * @precondition none
+     * @postcondition none
+     *
+     * @return the option selected
+     */
+    private int getOption() {
+        this.displayMenu(); // Prints out the menu
+
+        // Asks for the option and begins the loop until a valid option is gathered.
+        System.out.print("Enter option number: ");
+        int input = getIntegerInput();
+        while (input < 1 || input > 4) { // Compares it to the valid options available.
+            System.out.println("\nPlease enter a valid input.");
+            System.out.print("Enter option number: ");
+            input = getIntegerInput();
+        }
+        System.out.println();
+        return input;
+    }
+
+    /**
+     * Gets user input to a number. A prompt must be provided prior to running this method.
+     * If the input was not an integer/(unable to be autoboxed), returns -1.
+     *
+     * @precondition none
+     * @postcondition none
+     *
+     * @return the integer input, if invalid -1.
+     */
+    protected int getIntegerInput() {
+        Scanner sc = new Scanner(System.in);
+        try {
+            String textInput = sc.nextLine();
+            return Integer.parseInt(textInput);
+        } catch (Exception e) {
+            return -1;
+        }
+    }
+
+    public void executeOption(int option) {
+        /* The option used for the values generation */
+        if (option == 1) {
+            this.randomDistinct();
+            System.out.println("The generated Values: ");
+
+            /* Displays the generated values */
+            for (int i = 0; i < this.values.length; i++) {
+                System.out.print(String.format("%-6s", this.values[i]));
+                /* Splits the rows at 30 columns */
+                if ((i+1) % 30 == 0) {
+                    System.out.println();
+                }
+            }
+            System.out.println();
+        } else if (option == 2) { /* Handles the table size */
+            System.out.println("Enter the table size: ");
+            System.out.print("Option: ");
+            int size = -1;
+            size = getIntegerInput();
+
+            /* Used if the table input is invalid */
+            while (size < 1) {
+                System.out.println("Enter a valid table size: (size > 0)");
+                System.out.print("Option: ");
+                size = getIntegerInput();
+            }
+            this.tableSize = size;
+        } else if (option == 3) { /* Generates and displays the table */
+            if (this.values == null) { /* Used to check if the values have been generated */
+                System.out.println("Please generate the values first.");
+                System.out.println();
+                return;
+            }
+            if (this.tableSize < 1) { /* Used to check if the table size has been set */
+                System.out.println("Please enter a table size.");
+                System.out.println();
+                return;
+            }
+            /* Runs the search */
+            this.runIntSearch();
+        }
+        System.out.println();
+    }
+
     /**
      * Generates a list of 1024 random, non-repeating, integers and assigns them to the values field.
      */
@@ -37,15 +159,21 @@ public class TestInterpolationSearch {
     }
 
     public void runIntSearch() {
-        int totalDivisions;
+        System.out.println(this.values.length + " " + this.tableSize);
+        int totalDivisions = 0;
         Random rand = new Random();
 
-        System.out.println("  Key\t\tFound\t\tIndex\t\tDivisions");
+        System.out.println("  " + String.format("%-10s%-10s%-10s%-10s", "Key", "Found", "Index", "Divisions"));
         System.out.println("----------------------------------------------");
         for (int i = 0; i < this.tableSize; i++) {
             int key = rand.nextInt(9999) + 1;
             InterpolationSearch results = new InterpolationSearch(this.values, key);
-            System.out.println("  " + key + "\t\t" + results.isFound() + "\t\t" + results.getIndex() + "\t\t" + results.getDivisions());
-        }
+            System.out.println("  " + String.format("%-10s%-10s%-10s%-10s", key, results.isFound(), results.getIndex(), results.getDivisions()));
+            totalDivisions += results.getDivisions();
+        }
+        double averageDivs = (double) totalDivisions / (double) this.tableSize;
+        System.out.println("\nDivisions average:    " + averageDivs);
+        System.out.println("Difference:           " + Math.abs(3.322 - averageDivs));
+        System.out.println();
     }
 }