ICS Assignment 5

Username and Password Checker §

import java.util.Scanner;  
  
public class Main {  
    public static void main(String[] args) {  
        // user and password checker
        // caleb b  
        String correctUser = "martingrove_ci";  
        String correctPass = "mcipassword";  
        Scanner input = new Scanner(System.in);  
        System.out.println("Enter your username: ");  
        String user = input.nextLine();  
        System.out.println("Enter your password: ");  
        String pass = input.nextLine();  
        if (user.equals(correctUser) && pass.equals(correctPass)) {  
            System.out.println("Welcome! :3");  
        } else {  
            System.out.println("Incorrect username or password. Please try again.");  
            // run the program again  
            main(args);  
        }  
    }  
}

Detect the Season §

import java.text.DecimalFormat;  
import java.util.Scanner;  
  
public class Main {  
    public static void main(String[] args) {  
        // season detector  
        // caleb b
        Scanner scanner = new Scanner(System.in);  
        DecimalFormat df = new DecimalFormat("#.##");  
        double[] temperatures = new double[7];  
        String[] days = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};  
        for (int i = 0; i < temperatures.length; i++) {  
            System.out.println("Enter the temperature for " + days[i] + " in Celcius: ");  
            temperatures[i] = scanner.nextDouble();  
        }  
        double average = 0;  
        for (double temperature : temperatures) {  
            average += temperature;  
        }  
        average /= temperatures.length;  
        System.out.println("The average temperature is " + df.format(average) + " degrees Celcius.");  
        if (average < 0) {  
            System.out.print("It's likely Winter.");  
        }  
        else if (average > 20) {  
            System.out.print("It's likely Summer.");  
        }  
        else {  
            System.out.print("It's likely Spring or Fall.");  
        }  
    }  
}

Car Motion Calculator Revisited §

import java.text.DecimalFormat;  
import java.util.Scanner;  
  
import static java.lang.Double.NaN;  
  
public class Main {  
    // car motion calculator
    // caleb b  
    private static double time = NaN;  
    private static double distance = NaN;  
    private static double speed = NaN;  
    private static boolean timeSpecified = false;  
    private static boolean distanceSpecified = false;  
    private static boolean speedSpecified = false;  
    public static void main(String[] args) {  
        getInput(); // get the first input  
        getInput(); // get the second input  
        DecimalFormat df = new DecimalFormat("#.##");  
        if (Double.isNaN(time)) {  
            time = distance / speed;  
            System.out.println("Time: " + df.format(time) + " seconds");  
        }  
        if (Double.isNaN(distance)) {  
            distance = speed * time;  
            System.out.println("Distance: " + df.format(distance) + " meters");  
        }  
        if (Double.isNaN(speed)) {  
            speed = distance / time;  
            System.out.println("Speed: " + df.format(speed) + " meters per second");  
        }  
    }  
  
    public static void getInput() {  
        Scanner scan = new Scanner(System.in);  
        System.out.println("Would you like to specify distance, time, or speed? (d/t/s)");  
        String input = scan.nextLine();  
        String invalidInputReason = "";  
        if (!validateInputType(input)) {  
            System.out.println("Invalid input. Please try again.");  
            getInput();  
        }  
        System.out.println("Please enter the " + input + " in meters.");  
        double value = scan.nextDouble();  
        if (value <= 0) {  
            System.out.println("Input must be greater than 0. Please try again.");  
            getInput();  
        }  
        if (input.equalsIgnoreCase("d") || input.equalsIgnoreCase("distance")) {  
            if (!distanceSpecified) {  
                distance = value;  
                distanceSpecified = true;  
            } else {  
                invalidInputReason = "distance is already specified";  
            }  
        }  
        if (input.equalsIgnoreCase("t") || input.equalsIgnoreCase("time")) {  
            if (!timeSpecified) {  
                time = value;  
                timeSpecified = true;  
            } else {  
                invalidInputReason = "time is already specified";  
            }  
        }  
        if (input.equalsIgnoreCase("s") || input.equalsIgnoreCase("speed")) {  
            if (!speedSpecified) {  
                speed = value;  
                speedSpecified = true;  
            } else {  
                invalidInputReason = "speed is already specified";  
            }  
        }  
        if (!invalidInputReason.equals("")) {  
            System.out.println("Invalid input. " + invalidInputReason + ". Please try again.");  
            getInput();  
        }  
    }  
  
    public static boolean validateInputType(String input) {  
        if (input.equalsIgnoreCase("d") || input.equalsIgnoreCase("distance")) {  
            return true;  
        }  
        if (input.equalsIgnoreCase("t") || input.equalsIgnoreCase("time")) {  
            return true;  
        }  
        return input.equalsIgnoreCase("s") || input.equalsIgnoreCase("speed");  
    }  
}

Number of Coins Calculator §

import java.util.Scanner;  
  
public class Main {  
    public static void main(String[] args) {  
        // coin calculator  
        // caleb b        Scanner scanner = new Scanner(System.in);  
        System.out.println("Enter the amount of money (0-100): ");  
        double money = scanner.nextDouble();  
        if (money < 0 || money > 100) {  
            System.out.println("Invalid input");  
            return;        }  
        if (money == 0) {  
            System.out.println("No coins");  
            return;        }  
        int[] coins = {25, 10, 5, 1};  
        int[] coinCount = new int[4];  
        int i = 0;  
        while (money > 0) {  
            if (money >= coins[i]) {  
                money -= coins[i];  
                coinCount[i]++;  
            } else {  
                i++;  
            }  
        }  
        System.out.println("Quarters: " + coinCount[0]);  
        System.out.println("Dimes: " + coinCount[1]);  
        System.out.println("Nickels: " + coinCount[2]);  
        System.out.println("Pennies: " + coinCount[3]);  
    }  
  
}

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