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f04910cb73
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1feed10d53
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.idea/.gitignore
vendored
3
.idea/.gitignore
vendored
@ -8,5 +8,4 @@
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/dataSources.local.xml
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.iml
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.xml# GitHub Copilot persisted chat sessions
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/copilot/chatSessions
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.xml
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@ -48,16 +48,20 @@ public class InterpolationSearch {
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/* Checks if high is the same thing as low to prevent division by zero. */
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if (high != low) {
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probe = low + (((key - array[low]) * (high - low)) / (array[high] - array[low]));
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/* This is here due to the fact that it is not always divided as there is only 1 element left. */
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this.divisions++;
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} else {
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probe = high;
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if (array[probe] != key) {
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break;
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}
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}
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/* Checks if it passed the element due to it not being in list. */
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if (array[high] < key || array[low] > key) {
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break;
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}
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/* Checks if the key is less than the probe's value */
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if (array[probe] > key) {
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high = probe - 1;
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@ -9,128 +9,6 @@ public class TestInterpolationSearch {
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/** Holds the size of the table to generate */
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public int tableSize;
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public static void main(String[] args) {
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TestInterpolationSearch program = new TestInterpolationSearch();
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program.start();
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}
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/**
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* Used as the main sentential loop and loops until the exit option is selected.
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*
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* @precondition none
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* @postcondition none
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*/
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public void start() {
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int option = this.getOption();
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while (option != 4) {
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this.executeOption(option);
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option = this.getOption();
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}
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}
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/**
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* Displays the menu options.
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*
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* @precondition none
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* @postcondition the menu is displayed.
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*/
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private void displayMenu() {
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System.out.println("----------------------MAIN MENU-------------------");
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System.out.println("1. Create, populate, and display array Values[]");
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System.out.println("2. Read output table size");
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System.out.println("3. Run interpolation search and display outputs");
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System.out.println("4. Exit program");
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System.out.println();
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}
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/**
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* Prints out the menu of options, asks for an input, and if that input is invalid it prints an error and
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* prompts the user again for the input.
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*
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* @precondition none
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* @postcondition none
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*
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* @return the option selected
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*/
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private int getOption() {
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this.displayMenu(); // Prints out the menu
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// Asks for the option and begins the loop until a valid option is gathered.
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System.out.print("Enter option number: ");
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int input = getIntegerInput();
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while (input < 1 || input > 4) { // Compares it to the valid options available.
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System.out.println("\nPlease enter a valid input.");
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System.out.print("Enter option number: ");
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input = getIntegerInput();
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}
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System.out.println();
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return input;
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}
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/**
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* Gets user input to a number. A prompt must be provided prior to running this method.
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* If the input was not an integer/(unable to be autoboxed), returns -1.
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*
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* @precondition none
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* @postcondition none
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*
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* @return the integer input, if invalid -1.
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*/
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protected int getIntegerInput() {
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Scanner sc = new Scanner(System.in);
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try {
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String textInput = sc.nextLine();
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return Integer.parseInt(textInput);
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} catch (Exception e) {
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return -1;
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}
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}
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public void executeOption(int option) {
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/* The option used for the values generation */
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if (option == 1) {
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this.randomDistinct();
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System.out.println("The generated Values: ");
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/* Displays the generated values */
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for (int i = 0; i < this.values.length; i++) {
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System.out.print(String.format("%-6s", this.values[i]));
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/* Splits the rows at 30 columns */
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if ((i+1) % 30 == 0) {
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System.out.println();
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}
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}
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System.out.println();
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} else if (option == 2) { /* Handles the table size */
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System.out.println("Enter the table size: ");
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System.out.print("Option: ");
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int size = -1;
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size = getIntegerInput();
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/* Used if the table input is invalid */
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while (size < 1) {
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System.out.println("Enter a valid table size: (size > 0)");
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System.out.print("Option: ");
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size = getIntegerInput();
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}
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this.tableSize = size;
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} else if (option == 3) { /* Generates and displays the table */
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if (this.values == null) { /* Used to check if the values have been generated */
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System.out.println("Please generate the values first.");
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System.out.println();
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return;
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}
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if (this.tableSize < 1) { /* Used to check if the table size has been set */
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System.out.println("Please enter a table size.");
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System.out.println();
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return;
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}
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/* Runs the search */
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this.runIntSearch();
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}
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System.out.println();
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}
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/**
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* Generates a list of 1024 random, non-repeating, integers and assigns them to the values field.
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*/
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@ -159,21 +37,15 @@ public class TestInterpolationSearch {
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}
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public void runIntSearch() {
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System.out.println(this.values.length + " " + this.tableSize);
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int totalDivisions = 0;
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int totalDivisions;
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Random rand = new Random();
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System.out.println(" " + String.format("%-10s%-10s%-10s%-10s", "Key", "Found", "Index", "Divisions"));
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System.out.println(" Key\t\tFound\t\tIndex\t\tDivisions");
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System.out.println("----------------------------------------------");
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for (int i = 0; i < this.tableSize; i++) {
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int key = rand.nextInt(9999) + 1;
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InterpolationSearch results = new InterpolationSearch(this.values, key);
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System.out.println(" " + String.format("%-10s%-10s%-10s%-10s", key, results.isFound(), results.getIndex(), results.getDivisions()));
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totalDivisions += results.getDivisions();
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System.out.println(" " + key + "\t\t" + results.isFound() + "\t\t" + results.getIndex() + "\t\t" + results.getDivisions());
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}
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double averageDivs = (double) totalDivisions / (double) this.tableSize;
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System.out.println("\nDivisions average: " + averageDivs);
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System.out.println("Difference: " + Math.abs(3.322 - averageDivs));
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System.out.println();
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}
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}
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