Workbook Exercises

import java.util.Scanner;

public class JavaExercises {
    public static void main(String[] args) {

        ///////////////////// Section 1 - Building Blocks /////////////////////
        //----------------Ex1------------------
        /*
        Scanner sc = new Scanner(System.in);
        int radius = 0;
        System.out.println("Please enter a circle radius: ");
        radius = sc.nextInt();
        if (radius < 0) {
            radius = 0;
            System.out.println("Radius cannot be negative! Bad Input!");
        } else {
            System.out.printf("A circle with radius of: %dm has a perimeter of: %fm and an area of: %fm^2"
                              , radius, Math.PI*radius*radius, 2*radius*Math.PI);
        }
        */

        //----------------Ex2------------------
        /*
        Scanner sc = new Scanner(System.in);
        final int TOAST = 12, CHEAP_EXTRAS = 2, EXP_EXTRAS = 3;
        int toastTotalPrice = TOAST;
        char c = ' ';
        while(true) {
            System.out.println("Please enter the desired extras on the toast. M - Mushrooms, O - Olives, C - Corn, " +
                               "B - Bulgarian cheese, E - Extra cheese, X - Go to checkout");
            c = sc.next().charAt(0);
            if(c == 'X' || c == 'x') {
                break;
            }
            switch (c) {
                case 'M' :
                case 'm' :
                case 'O' :
                case 'o' :
                case 'C' :
                case 'c' :
                    toastTotalPrice += CHEAP_EXTRAS;
                    break;
                case 'B' :
                case 'b' :
                case 'E' :
                case 'e' :
                    toastTotalPrice += EXP_EXTRAS;
                    break;
                default:
                    System.out.println("Invalid Input! Try again");
            }
        }
        System.out.printf("Total toast price is: %d", toastTotalPrice);
        */

        //----------------Ex2------------------
        /*
        Scanner sc = new Scanner(System.in);
        final int PRICE_FOR_ONE_KM_TRANS = 5;
        final int FLOOR_PRICE_FOR_EACH_KG = 1;
        int initPrice = 0;
        int weight = 0;
        int floor = 0;
        int dist = 0;
        System.out.println("Please enter the item's price, its weight, what floor you leave in and the distance from the store: ");
        initPrice = sc.nextInt();
        weight = sc.nextInt();
        floor = sc.nextInt();
        dist = sc.nextInt();
        sc.nextLine();
        sc.close();
        System.out.printf("Total transport price, the item's price included, is: %f",
                           initPrice + weight*floor*FLOOR_PRICE_FOR_EACH_KG + PRICE_FOR_ONE_KM_TRANS*dist + initPrice*0.1);
        */

        ///////////////////// Section 2 - Language //////////////////
        //----------------Ex1------------------
        /*
        Scanner sc = new Scanner(System.in);
        int age;
        System.out.println("Please enter your age: ");
        age = sc.nextInt();
        if(age < 18) {
            System.out.println("You are not adult!");
        } else {
            System.out.println("You are an adult!");
        }
        sc.close();
        */

        //----------------Ex2------------------
        /*
        Scanner sc = new Scanner(System.in);
        int age;
        System.out.println("Please enter your age: ");
        age = sc.nextInt();
        if(age < 18) {
            System.out.println("You are not adult!");
        } else if (age < 66){
            System.out.println("You are an adult!");
        } else {
            System.out.println("You are on pension!");
        }
        sc.close();
        */

        //----------------Ex3------------------
        /*
        Scanner sc = new Scanner(System.in);
        int number;
        System.out.println("Please enter a 2 digit number: ");
        number = sc.nextInt();
        sc.close();
        if(number < 10 || number > 99) {
            System.out.println("Bad Input!");
        } else {
            if(number/10 == number%10) {
                System.out.println("Digits are identical!");
            } else {
                System.out.println("Digits are not the same!");
            }
        }
        */

        //----------------Ex4------------------
        /*
        Scanner sc = new Scanner(System.in);
        int number;
        System.out.println("Please enter a 3 digit number: ");
        number = sc.nextInt();
        sc.close();
        if(number < 100 || number > 999) {
            System.out.println("Bad Input!");
        } else {
            if((number/10 == number%100) && (number/100 == number%10)) {
                System.out.println("Digits are identical!");
            } else {
                System.out.println("Digits are not the same!");
            }
        }
        */

        //----------------Ex5------------------
        /*
        Scanner sc = new Scanner(System.in);
        int number;
        System.out.println("Please enter a 2 digit number: ");
        number = sc.nextInt();
        sc.close();
        if(number < 10 || number > 99) {
            System.out.println("Bad Input!");
        } else {
            if(number < 90 && number / 10 == number % 10 - 1) {
                System.out.println("Digits are consecutive!");
            } else {
                System.out.println("Digits are not consecutive!");
            }
        }
        */

        //----------------Ex6------------------
        /*
        Scanner sc = new Scanner(System.in);
        int number;
        System.out.println("Please enter a 3 digit number: ");
        number = sc.nextInt();
        sc.close();
        if(number < 100 || number > 999) {
            System.out.println("Bad Input!");
        } else {
            if(number < 900 && number / 100 == (number % 100 / 10) - 1 && (number % 100 / 10) == number % 10 - 1) {
                System.out.println("Digits are consecutive!");
            } else {
                System.out.println("Digits are not consecutive!");
            }
        }
        */

        //----------------Ex7------------------
        //
        Scanner sc = new Scanner(System.in);
        int maxFuel, currentFuel;
        System.out.println("Please enter size of fuel tank and current fuel in the car: ");
        maxFuel = sc.nextInt();
        currentFuel = sc.nextInt();
        sc.close();
        if(currentFuel < maxFuel * 0.15) {
            System.out.println("Put some gaz on your vehicle!");
        } else {
            System.out.println("Your'e doing just fine!");
        }
        //
    }
}