Began implementation of TestInterpolationSearch#runIntSearch

src/Assignments/A3/InterpolationSearch.java

@@ -1,144 +1,96 @@
-// Name: Jonathan Turner
-// Class: CS 4306/01
-// Term: Spring 2024
-// Instructor: Dr. Haddad
-// Assignment: 3
-// IDE Name: IntelliJ
 package Assignments.A3;
 
-import java.util.Scanner;
-
-/**
- * This class is used to perform the interpolation search algorithm and display the results.
- *
- * @author Jonathan Turner
- * @version Spring 2024
- */
 public class InterpolationSearch {
 
-    /**
-     * Starts the program.
-     * @param args the program arguments.
-     */
-    public static void main(String[] args) {
-        InterpolationSearch program = new InterpolationSearch();
-        program.start();
-    }
+    /** Holds if the value was found or not. */
+    private final boolean found;
+    /** Holds the index of the key, -1 if not found. */
+    private final int index;
+    /** Holds the number of divisions used to perform the search. */
+    private int divisions;
 
     /**
-     * Used as the main sentential loop and loops until the exit option is selected.
+     * Accepts the values, performs the search, and assigns the fields to the corresponding output data.
+     * <p>
+     * This constructor accepts in the array to be searched and the key to be searched for. Based off of this,
+     * the method will perform some precondition checks to ensure the values are valid and then perform the
+     * search using the formula provided in the slide deck.
+     * </p>
      *
-     * @precondition none
-     * @postcondition none
+     * @param array The list of values being search through.
+     * @param key   The desired value being searched for.
+     *
+     * @throws IllegalArgumentException If the array is empty.
      */
-    public void start() {
-        int option = this.getOption();
-        while (option != 4) {
-            this.executeOption(option);
-            option = this.getOption();
-        }
-    }
-
-    /**
-     * Performs the action related to the option that was chosen.
-     *
-     * @precondition none
-     * @postcondition the action was performed.
-     *
-     * @param option the option that was chosen.
-     */
-    private void executeOption(int option) {
-
-        System.out.println();
-    }
-
-    /**
-     * Uses private fields to generate the number of subsets and comparisons.
-     *
-     * @precondition text != null && text != empty
-     * @postcondition the results are generated.
-     */
-    private void performAlgorithm() {
-
-    }
-
-    /**
-     * 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;
-    }
-
-    /**
-     * 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();
-    }
-
-    /**
-     * Gets a string and returns it. If the input is not valid it loops until valid.
-     *
-     * @precondition none
-     * @postcondition none
-     * @return a user-input text string.
-     */
-    private String getString() {
-        System.out.println("Specify a text to check number of substrings.");
-        System.out.print("Text: ");
-        Scanner sc = new Scanner(System.in);
-        String input = sc.nextLine();
-
-        while (input == null || input.isEmpty()) {
-            System.out.println("Please specify a valid text to check substrings.");
-            System.out.print("Text: ");
-            input = sc.nextLine();
+    public InterpolationSearch(int[] array, int key) {
+        /* Precondition for empty list. */
+        if (array.length == 0) {
+            throw new IllegalArgumentException("The searched array cannot be empty.");
         }
 
-        return input;
+        /* Precondition check to see if the list is size 1 element. */
+        if (array.length == 1) {
+            this.found = (array[0] == key);
+            this.divisions = 0;
+            this.index = (array[0] == key ? 0 : -1);
+            return;
+        }
+
+        /* Sets the default values for the search */
+        int low = 0;
+        int high = array.length-1;
+        this.divisions = 0;
+
+        /* Iterates as long as high is not less than low */
+        while (high >= low) {
+            int probe;
+
+            /* 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;
+            }
+            /* Checks if the key is less than the probe's value */
+            if (array[probe] > key) {
+                high = probe - 1;
+            } else if (array[probe] < key) { /* Checks if the key is greater than the probes value */
+                low = probe + 1;
+            } else { /* The key was found at the probes index. */
+                this.found = true;
+                this.index = probe;
+                return;
+            }
+        }
+        /* Sets the values if the key was not in the list. */
+        this.found = false;
+        this.index = -1;
     }
 
     /**
-     * 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.
+     * Gets if the key was found.
+     * @return if it was found.
      */
-    private int getIntegerInput() {
-        Scanner sc = new Scanner(System.in);
-        try {
-            String textInput = sc.nextLine();
-            return Integer.parseInt(textInput);
-        } catch (Exception e) {
-            return -1;
-        }
+    public boolean isFound() {
+        return found;
+    }
+
+    /**
+     * Gets the number of divisions it took for the search to conclude.
+     * @return the number of divisions
+     */
+    public int getDivisions() {
+        return divisions;
+    }
+
+    /**
+     * Gets the index at which the key was found. If the key was not found it returns -1.
+     * @return the found index.
+     */
+    public int getIndex() {
+        return index;
     }
 }

src/Assignments/A3/TestInterpolationSearch.java

@@ -0,0 +1,51 @@
+package Assignments.A3;
+
+import java.util.*;
+
+public class TestInterpolationSearch {
+
+    /** Holds the list of 1024 unique values used to search through */
+    public int[] values;
+    /** Holds the size of the table to generate */
+    public int tableSize;
+
+    /**
+     * Generates a list of 1024 random, non-repeating, integers and assigns them to the values field.
+     */
+    public void randomDistinct() {
+        /* Used to track what ints have been used */
+        HashSet<Integer> isUsed = new HashSet<>();
+        int[] newList = new int[1024];
+        Random random = new Random();
+
+        /* Loops 1024 times and assigns a new unique value each time. */
+        for (int i = 0; i < 1024; i++) {
+            int newValue = -1;
+
+            /* Ensures that there is no duplicate values */
+            do {
+                newValue = random.nextInt(9999) + 1;
+            } while (isUsed.contains(newValue));
+
+            /* Adds the value to the known list and also to the generated list. */
+            newList[i] = (newValue);
+            isUsed.add(newValue);
+        }
+        /* Sorts and assigns the values generated to the field. */
+        Arrays.sort(newList);
+        this.values = newList;
+    }
+
+    public void runIntSearch() {
+        int totalDivisions;
+        Random rand = new Random();
+
+        System.out.println("  Key\t\tFound\t\tIndex\t\tDivisions");
+        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());
+        }
+    }
+}