Assignment A4

Product of Natural Numbers §

import java.util.Scanner;  
  
public class Main {  
    public static void main(String[] args) {  
        // caleb b  
        // product of natural numbers        
        Scanner scan = new Scanner(System.in);  
        int timesUsed = 0;  
        while (timesUsed < 3) {  
            System.out.println("Enter a number: ");  
            int n = scan.nextInt();  
            if (n < 0) {  
                System.out.println("Please enter a positive number.");  
                continue;            }  
            print_1_to_N_product(n);  
            timesUsed++;  
        }  
    }  
  
    public static void print_1_to_N_product(int n) {  
        int product = 1;  
        for (int i = 1; i <= n; i++) {  
            product *= i;  
        }  
        System.out.println(product);  
    }  
}

Calculator Function §

import java.util.Scanner;  
  
public class Main {  
    public static void main(String[] args) {  
        // caleb b  
        // calculator function        
        Scanner scan = new Scanner(System.in);  
        int timesUsed = 0;  
        while(timesUsed < 4) {  
            try {  
                System.out.println("Enter an operation (a, s, m, d): ");  
                String operation = scan.next();  
                System.out.println("Enter a number: ");  
                int a = scan.nextInt();  
                System.out.println("Enter another number: ");  
                int b = scan.nextInt();  
                calculator(operation, a, b);  
                timesUsed++;  
            } catch (Exception e) {  
                System.out.println("Invalid input");  
            }  
        }  
    }  
  
    public static void calculator(String operation, int a, int b) {  
        System.out.println("--------------------");  
        System.out.println("Result:");  
        switch (operation) {  
            case "a":  
                System.out.println(sum(a, b));  
                break;            case "s":  
                System.out.println(difference(a, b));  
                break;            case "m":  
                System.out.println(product(a, b));  
                break;            case "d":  
                System.out.println(quotient(a, b));  
                break;            default:  
                System.out.println("Invalid operation");  
        }  
        System.out.println("--------------------");  
    }  
  
    public static int sum(int a, int b) {  
        return a + b;  
    }  
    public static int difference(int a, int b) {  
        return a - b;  
    }  
    public static int product(int a, int b) {  
        return a * b;  
    }  
    public static int quotient(int a, int b) {  
        return a / b;  
    }  
}

Prime Number Checker §

import java.util.Scanner;  
  
public class Main {  
    public static void main(String[] args) {  
        // caleb b  
        // prime number checker        
        int timesUsed = 0;  
        Scanner scan = new Scanner(System.in);  
        while (timesUsed < 2) {  
            System.out.println("Enter a number to check if it is prime: ");  
            int num = scan.nextInt();  
            boolean isPrime = is_prime_number(num);  
            if (isPrime) {  
                System.out.println(num + " is a prime number.");  
            } else {  
                System.out.println(num + " is not a prime number.");  
            }  
            timesUsed++;  
        }  
    }  
  
    public static boolean is_prime_number(int num) {  
        int i = 2;  
        while (i < num) {  
            if (num % i == 0) {  
                return false;  
            }  
            i++;  
        }  
        return true;  
    }  
}

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