Homework LAB 9

//hw1

import java.util.Scanner;

public class HomeworkOne {
    public static boolean isPrime(int a) {
        boolean isPrime = true;
        if (a <= 1) {
            isPrime = false;
        } else {
            for (int i = 2; i < a; i++) {
                if (a % i == 0) {
                    isPrime = false;
                    break;
                }
            }

        }
        return isPrime;
    }

    public static boolean isPerfect(int a) {
        int sum = 0;
        boolean isPerfect = false;
        for (int i = 1; i < a; i++) {
            if (a % i == 0) {
                sum += i;
            }
        }

        if (sum == a) {
            isPerfect = true;
        }
        return isPerfect;
    }

    public static int special_sum(int a) {
        int sum = 0;
        for (int i = 2; i <= a; i++) {
            if (isPrime(i) || isPerfect(i)) {
                sum += i;
            }
        }

        return sum;

    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        System.out.println(isPrime(15));
        System.out.println(isPerfect(33));
        System.out.println(special_sum(num));

    }
}


//hw2

public class HomeworkTwo {
    public static void showDots(int a) {
        for (int i = 0; i < a; i++) {
            System.out.print(".");
        }
    }
    public static void show_palindrome(int num) {
        for (int i = 1; i <= num; i++) {
            System.out.print(i);
        }
        for (int i = num - 1; i > 0; i--) {
            System.out.print(i);
        }
    }

    public static void showDiamond(int a) {
        for (int i = 1; i <= a; i++) {
            showDots(a - i);
            show_palindrome(i);
            showDots(a - i);
            System.out.println();
        }
        for (int i = a - 1; i > 0; i--) {
            showDots(a - i);
            show_palindrome(i);
            showDots(a - i);
            System.out.println();
        }
    }

    public static void main(String[] args) {
        showDots(5);
        System.out.println();
        show_palindrome(5);
        System.out.println();
        showDiamond(5);


    }
}


//hw3

import java.util.Scanner;

public class HomeworkThree {
    public static double calcTax(int age, int salary) {
        double tax = 0.00;
        if (age > 18 && salary > 10000) {
            if (salary >= 10000 && salary <= 20000) {
                 tax = salary * 0.07;
            }
            else if (salary > 20000) {
                 tax = salary * 0.14;
            }

        }
        return tax;
    }

    public static void calcYearlyTax() {
        Scanner sc = new Scanner(System.in);
        int age = sc.nextInt();
        double totalTax = 0;
        double monthly_tax = 0;

        for (int i = 1; i <= 12; i++) {
            int salary = sc.nextInt();
            monthly_tax = calcTax(age, salary);
            totalTax += monthly_tax;
            System.out.println("Month" + i + " tax: " + monthly_tax);


        }
        System.out.println("Total Yearly Tax: " + totalTax);

    }

    public static void main(String[] args) {
        System.out.println(calcTax(16,20000));
        System.out.println(calcTax(20, 18000));
        calcYearlyTax();

    }

}


//h4

import java.util.Scanner;
public class HomeworkFour {
    public static void oneToN(int one, int a) {
        for (int i = 1; i <= a; i++) {
            System.out.print(i + " ");
        }
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        oneToN(1, N);
    }
}