#programming challenges

import java.util.Scanner; public class Chapter3 {    private static Scanner keyboard = new Scanner(System.in);    private static void challenge1() {        System.out.println("Enter a whole number within the range 1 - 10, inclusive.");        int number = keyboard.nextInt();        switch(number) {            case 1:                System.out.println("I");                break;            case 2:                System.out.println("II");                break;            case 3:                System.out.println("III");                break;            case 4:                System.out.println("IV");                break;            case 5:                System.out.println("V");                break;            case 6:                System.out.println("VI");                break;            case 7:                System.out.println("VII");                break;            case 8:                System.out.println("VIII");                break;            case 9:                System.out.println("IX");                break;            case 10:                System.out.println("X");                break;            default:                System.out.println("You didn't enter a whole number silly goose!");        }    }    private static void challenge2() {        System.out.println("Enter a date like so 6/10/60 so that the month times the day is equal to the year.");        String[] date = keyboard.nextLine().split("/");        if (Integer.parseInt(date[0]) * Integer.parseInt(date[1]) == Integer.parseInt(date[2])) {            System.out.println("MAGIC!");        }        else {            System.out.println("Not magic.");        }    }    private static void challenge3() {        System.out.println("Enter your weight in lbs and height in inches.");        String[] weightHeight = keyboard.nextLine().split("\\s");        double bmi = Integer.parseInt(weightHeight[0]) * 703/ Math.pow(Double.parseDouble(weightHeight[1]), 2);        if (bmi < 18.5) {            System.out.println("You're underweight.");        }        else if (bmi >= 18.5 && bmi <= 25) {            System.out.println("Your weight is optimal for your height and lifestyle.");        }        else if (bmi > 25){            System.out.println("You're overweight.");        }        else {            System.out.println("Unable to determine your BMI.");        }    }    private static void challenge4() {        System.out.println("Enter 3 test score grades.");        String[] grades = keyboard.nextLine().split("\\s");        double grade1 = Double.parseDouble(grades[0]);        double grade2 = Double.parseDouble(grades[1]);        double grade3 = Double.parseDouble(grades[2]);        double average = (grade1 + grade2 + grade3)/grades.length;        if (average >= 90 && average <= 100) {            System.out.println("average letter grade is A.");        }        else if (average >= 80 && average <= 89) {            System.out.println("average letter grade is B.");        }        else if (average >= 70 && average <= 79) {            System.out.println("average letter grade is C.");        }        else if (average >= 60 && average <= 69) {            System.out.println("average letter grade is D.");        }        else if (average <59){            System.out.println("average letter grade is F.");        }        else {            System.out.println("unable to determine average letter grade.");        }    }    private static void challenge5() {        System.out.println("Enter an objects mass in kilograms.");        double mass = Double.parseDouble(keyboard.nextLine());        double weight = mass * 9.8; // N        if (weight < 10) {            System.out.println("item is too light.");        }        else if (weight > 1000) {            System.out.println("item is too heavy.");        }        else {            System.out.println(weight);        }    }    private static void challenge6() {        System.out.println("Enter a number of seconds.");        double numberOfSeconds = Double.parseDouble(keyboard.nextLine());        if (numberOfSeconds >= 60 && numberOfSeconds < 3600) {            System.out.println(numberOfSeconds/60 + " minutes.");        }        else if (numberOfSeconds >= 3600 && numberOfSeconds < 86400) {            System.out.println(numberOfSeconds/3600 + " hours.");        }        else {            System.out.println(numberOfSeconds/86400 + " days.");        }    }    private static void challenge7() {        System.out.println("Enter three names.");        String[] names = keyboard.nextLine().split("\\s");        String[] ascendingNames = new String[names.length];        for (int i = 0; i < names.length; i++) {            for (int j = 0; j < names.length; j++) {                if (names[i].charAt(0) < names[j].charAt(0)) {                    ascendingNames[i] = names[i];                }            }        }        for (String name : ascendingNames) {            System.out.print(name + " ");        }    }    private static void challenge8() {        double packagePrice = 99;        System.out.println("Enter the amount of software packages you wish to purchase.");        int numberOfPackages = keyboard.nextInt();        double quantityDiscountPercentage = 0;        double discount = 0;        double total = 0;        if (numberOfPackages >= 10 && numberOfPackages <= 19) {            quantityDiscountPercentage = 0.2;            discount = packagePrice * quantityDiscountPercentage;            total = packagePrice - discount;            System.out.println(total);        }        else if (numberOfPackages >= 20 && numberOfPackages <= 49) {            quantityDiscountPercentage = 0.3;            discount = packagePrice * quantityDiscountPercentage;            total = packagePrice - discount;            System.out.println(total);        }        else if (numberOfPackages >= 50 && numberOfPackages <=99) {            quantityDiscountPercentage = 0.4;            discount = packagePrice * quantityDiscountPercentage;            total = packagePrice - discount;            System.out.println(total);        }        else if (numberOfPackages >= 100) {            quantityDiscountPercentage = 0.5;            discount = packagePrice * quantityDiscountPercentage;            total = packagePrice - discount;            System.out.println(total);        }        else {            System.out.println("Unable to determine the quantity discount.");        }    }    private static void challenge9() {        System.out.println("Enter the weight of your package.");        double weight = keyboard.nextDouble();        if (weight <= 2) {            System.out.println("shipping charge: $1.10");        }        else if (weight > 2 && weight < 6) {            System.out.println("shipping charge: $2.20");        }        else if (weight > 6 && weight < 10) {            System.out.println("shipping charge: $3.70");        }        else if (weight > 10) {            System.out.println("shipping charge: $3.80");        }        else {            System.out.println("unable to determine shipping charge.");        }    }    private static void challenge10() {        System.out.println("Enter the number of calories and fat grams in a food item.");        String[] caloriesAndFat = keyboard.nextLine().split("\\s");        double caloriesFromFat = Double.parseDouble(caloriesAndFat[1]) * 9;        double fatPercentage = caloriesFromFat * Double.parseDouble(caloriesAndFat[0]);        boolean lowFat = fatPercentage < 0.3;        System.out.println(fatPercentage * 100 + "% fat.");        if (lowFat) {            System.out.println("LOW FAT");        }    }    private static void challenge11() {        System.out.println("Enter 3 runner names and their time in minutes it took each of them to finish the race.");        String[] namesAndTimes = keyboard.nextLine().split("\\s");        String[] names = {namesAndTimes[0], namesAndTimes[2], namesAndTimes[4]};        double[] times = {Double.parseDouble(namesAndTimes[1]), Double.parseDouble(namesAndTimes[3]), Double.parseDouble(namesAndTimes[5])};        for (int i = 0; i < times.length; i++) {            for (int j = 0; j < times.length; j++) {                String tempName = "";                double tempTime = 0;                if (times[i] < times[j]) {                    tempName = names[i];                    tempTime = times[i];                    names[i] = names[j];                    times[i] = times[j];                    names[j] = tempName;                    times[j] = tempTime;                }            }        }        int timesIndex = 0;        for(String name : names) {            System.out.println(name + " " + times[timesIndex]);            timesIndex++;        }    }    private void challenge12() {        int airSpeedPerSecond = 1100; // feet per second        int waterSpeedPerSecond = 4900;        int steelSpeedPerSecond = 16400;        System.out.println("Enter the medium (air,water,steel) and the distance the sound wave will travel.");        String[] mediumAndDistance = keyboard.nextLine().split("\\s");        String medium = mediumAndDistance[0];        double distance = Double.parseDouble(mediumAndDistance[1]);        double time = 0;        switch(medium) {            case "air":                time = distance / airSpeedPerSecond;                System.out.println(time);                break;            case "water":                time = distance / waterSpeedPerSecond;                System.out.println(time);                break;            case "steel":                time = distance / steelSpeedPerSecond;                System.out.println(time);                break;            default:                System.out.println("Unable to determine the time.");                break;        }    }    private static void challenge13() {        System.out.println("Enter the letter of your package and the number of hours used.");        String[] letterAndHours = keyboard.nextLine().split("\\s");        String letter = letterAndHours[0];        double hours = Double.parseDouble(letterAndHours[1]);        double pricePerMonth;        double pricePerHour;        double total;        switch(letter) {            case "A":                pricePerMonth = 9.95; // for 10 hours                pricePerHour = 2; // after 10 hours                if (hours > 10) {                    double extraHours = hours - 10;                    total = pricePerMonth + extraHours * pricePerHour;                } else {                    total = pricePerMonth;                }                System.out.println(total);                challenge14("A", total, hours);                break;            case "B":                pricePerMonth = 13.95; // for 20 hours                pricePerHour = 1; // after 20 hours                if (hours > 20) {                    double extraHours = hours - 10;                    total = pricePerMonth + extraHours * pricePerHour;                } else {                    total = pricePerMonth;                }                System.out.println(total);                challenge14("B", total, hours);                break;            case "C":                pricePerMonth = 19.95; // unlimited access                total = pricePerMonth;                System.out.println(total);                break;            default:                System.out.println("Unable to determine total.");                break;        }    }    private static void challenge14(String packageLetter, double total, double hours) {        double couldHaveSavedWithB;        double bPackagePrice;        double couldHaveSavedWithC;        double bPackagePricePerMonth = 13.95; // per month for 20 hours        double costPerExtraHour = 1; // per hour        double cPackagePrice = 19.95; // per month        switch(packageLetter) {            case "A":                // B package                if (hours > 20) {                    double extraHours = hours - 20;                    bPackagePrice = costPerExtraHour * extraHours + bPackagePricePerMonth;                }                else {                    bPackagePrice = bPackagePricePerMonth;                }                if (total > bPackagePrice) {                    couldHaveSavedWithB = total - bPackagePrice;                    System.out.println("Could have saved " + couldHaveSavedWithB);                }                else {                    System.out.println("This package seems to be a good fit.");                }                // C package                if (total > cPackagePrice) {                    couldHaveSavedWithC = total - cPackagePrice;                    System.out.println("Could have saved " + couldHaveSavedWithC);                }                break;            case "B":                // C package                if (total > cPackagePrice) {                    couldHaveSavedWithC = total - cPackagePrice;                    System.out.println("Could have saved " + couldHaveSavedWithC);                }                else {                    System.out.println("This package seems to be a good fit.");                }                break;            default:                System.out.println("Huh?");                break;        }    }    private static void challenge15() {        double monthlyFee = 10;        double checkFee;        double total;        System.out.println("Enter the number of checks written for the month.");        int numberOfChecks = keyboard.nextInt();        if (numberOfChecks > 0 && numberOfChecks < 20) {            checkFee = 0.1;            total = monthlyFee + numberOfChecks * checkFee;        }        else if (numberOfChecks >= 20 && numberOfChecks <= 39) {            checkFee = 0.08;            total = monthlyFee + numberOfChecks * checkFee;        }        else if (numberOfChecks >= 40 && numberOfChecks <= 59) {            checkFee = 0.06;            total = monthlyFee + numberOfChecks * checkFee;        }        else if (numberOfChecks >= 60) {            checkFee = 0.04;            total = monthlyFee + numberOfChecks * checkFee;        }        else {            total = monthlyFee;        }        System.out.println(total);    }    private static void challenge16() {        System.out.println("Enter the number of books you purchased this month.");        int numberOfBooks = keyboard.nextInt();        int numberOfPoints = 0; // default if purchased books is 0        if (numberOfBooks == 1) {            numberOfPoints = 5;        }        else if (numberOfBooks == 2) {            numberOfPoints = 15;        }        else if (numberOfBooks == 3) {            numberOfPoints = 30;        }        else if (numberOfBooks >= 4) {            numberOfPoints = 60;        }        System.out.println(numberOfPoints);    }    public static void main(String[] args) {        // insert desired method calls    } }

import java.util.*; public class Chapter2 {    private static Scanner keyboard = new Scanner(System.in);    private static void challenge1(){        String name = "Nicole Binette";        int age = 21;        double annualPay = 100000;        System.out.println("My name is " + name + ", my age is " + age + " and I hope to earn $" +                annualPay + " per year.");    }    private static void challenge2() {        String firstName = "Nicole", middleName = "Amporn", lastName = "Binette";        char firstInitial = 'N', middleInitial = 'A', lastInitial = 'B';        System.out.println(firstInitial + " " + middleInitial + " " + lastInitial);        System.out.println(firstName + " " + middleName + " " + lastName);    }    private static void challenge3() {        System.out.println("Nicole" + "\n16410 NE 99th ST Redmond, WA 98052" + "\n425-951-9256" +                "\nComputing and Software Development");    }    private static void challenge4() {        System.out.println("\t\t\t*");        System.out.println("\t\t   ***");        System.out.println("\t\t  *****");        System.out.println("\t\t *******");        System.out.println("\t\t  *****");        System.out.println("\t\t   ***");        System.out.println("\t\t\t*");    }    private static void challenge5() {        double salesDivisionsPercentage = 0.62;        double salesEstimatedGeneration = 4.6 * 0.62;    }    private static void challenge6() {        double acreInSquareFeet = 43560;        double numAcres = 389767 / acreInSquareFeet;    }    private static void challenge7() {        System.out.println("Enter purchase amount.");        double amount = keyboard.nextDouble();        double stateSalesTax = 0.04;        double countySalesTax = 0.02;        double totalSalesTax = stateSalesTax + countySalesTax;        double total = amount * totalSalesTax + amount;        System.out.println("amount: " + amount);        System.out.println("state tax: " + stateSalesTax);        System.out.println("county tax: " + countySalesTax);        System.out.println("total tax: " + totalSalesTax);        System.out.println("total: " + total);    }    private static void challenge8() {        double cookiesPerBag = 40;        double servingsPerBag = 10;        int calPerServing = 300;        System.out.println("Enter number of cookies eaten.");        double numberOfCookiesEaten = keyboard.nextDouble();        double totalCalories = numberOfCookiesEaten * (servingsPerBag / cookiesPerBag) * calPerServing;        System.out.println("Calories consumed: " + totalCalories);    }    private static void challenge9() {        System.out.println("Enter number of miles driven.");        double milesDriven = keyboard.nextDouble();        System.out.println("Enter gallons of gas used.");        double gallonsOfGasUsed = keyboard.nextDouble();        double mpg = milesDriven / gallonsOfGasUsed;        System.out.println(mpg);    }    private static void challenge10() {        System.out.println("Enter test scores separated by a space."); //Indicate the number of tests with that score with x. For example, 3 tests with a perfect score would be 100x3");        String[] tests = keyboard.nextLine().split("\\s");        Map<Double, Integer> testScores = new HashMap<>();        for (String string : tests) {            String[] test = string.split("x");            testScores.put(Double.parseDouble(test[0]), Integer.parseInt(test[1]));        }        Object[] scores = testScores.keySet().toArray();        Object[] numberOfTestsPerScore = testScores.values().toArray();        double total = 0;        int numberOfTests = 0;        for (int i = 0; i < scores.length; i++) {            total += (Double) scores[i] * (Integer) numberOfTestsPerScore[i];            numberOfTests += (Integer) numberOfTestsPerScore[i];        }        double average = total / numberOfTests;        System.out.println("average test score " + average);    }    private static void challenge11() {        System.out.println("Enter the retail price for a circuit board.");        double retailPrice = keyboard.nextDouble();        double percentProfit = 0.4;        double profit = retailPrice / percentProfit;        System.out.println("profit " + profit);    }    private static void challenge12() {        System.out.println("Enter the name of your favorite city.");        String favCity = keyboard.nextLine();        System.out.println(favCity.length() + " " + favCity.toUpperCase() + " " + favCity.toLowerCase() + " " + favCity.charAt(0));    }    private static void challenge13() {        double taxPercent = 0.0675;        System.out.println("Enter the price for the meal.");        double mealCharge = keyboard.nextDouble();        double mealChargeWithTax = mealCharge + taxPercent * mealCharge;        double tipPercent = 0.2;        double totalMealCharge = mealChargeWithTax + tipPercent * mealChargeWithTax;        System.out.println("total meal charge " + totalMealCharge);    }    private static void challenge14() {        System.out.println("Enter the number of males and females in registered for a class. Like so M F");        String[] maleAndFemale = keyboard.nextLine().split("\\s");        int male =  Integer.parseInt(maleAndFemale[0]);        int female = Integer.parseInt(maleAndFemale[1]);        int totalRegistered = male + female;        double percentMale = ((double) male / totalRegistered) * 100;        double percentFemale = ((double) female / totalRegistered) * 100;        System.out.println("percent male " + percentMale + "%" + "\npercent female " + percentFemale + "%");    }    private static void challenge15() {        int numOfStockShares = 600;        double pricePerShare = 21.77;        double percentCommission = 0.02;        double priceForStock = numOfStockShares * pricePerShare;        double commission = priceForStock * percentCommission;        double totalPrice = priceForStock + commission;        System.out.println("total price for stocks including commission " + totalPrice);    }    private static void challenge16() {        int customersSurveyed = 12467;        double percentConsuming1plus = 0.14;        double percentPartialToCitrus = 0.64;        double numPurchasing1plus = customersSurveyed * percentConsuming1plus;        double numPartialToCitrus = customersSurveyed * percentPartialToCitrus;        System.out.println("number of customers who purchase 1+ energy drinks per week " + numPurchasing1plus);        System.out.println("number of customers who are partial to citrus flavored energy drinks " + numPartialToCitrus);    }    private static void challenge17() {        // cookie recipe        double cupsSugar = 1.5;        double cupsButter = 1;        double cupsFlour = 2.75;        int makesCookies = 48;        System.out.println("Enter number of cookies you wish to make.");        int toMakeCookies = keyboard.nextInt();        double quotient = (double) toMakeCookies / makesCookies;        // adjust ingredients        System.out.println("cups of sugar " + cupsSugar * quotient + "\ncups of butter " + cupsButter * quotient +                "\ncups of flour " + cupsFlour * quotient);    }    private static void challenge18() {        System.out.println("Enter your name, your age, the name of a city, the name of a college, a profession," +                " a type of animal," +                "and a pet's name.");        String[] words = keyboard.nextLine().split(",\\s");        System.out.println("There once was a person named " + words[0] + " who lived in " + words[1] +                ". At the age of " + words[2] + ", " + words[0] + " went to college at " + words[3] +                ". " + words[0] + " graduated and went to work as a " + words[4] + ". Then, " + words[0] +                "adopted a(n)" + words[5] + " named " + words[6] + ". They both lived happily ever after!");    }    private static void challenge19() {        int numberOfShares = 1000;        double pricePerShare = 32.87;        double percentCommission = 0.02;        double commission = (numberOfShares * pricePerShare) * percentCommission;        double total = numberOfShares * pricePerShare + commission;        double salePricePerShare = 33.92;        double saleCommission = (numberOfShares * salePricePerShare) * percentCommission;        double totalSale = numberOfShares * salePricePerShare + saleCommission;        double profit = totalSale - total;        System.out.println("profit " + profit);    }    public static void main(String args[]) {        challenge1();        challenge2();        challenge3();        challenge4();        challenge7();        challenge8();        challenge9();        challenge10();        challenge11();        challenge12();        challenge13();        challenge14();        challenge15();        challenge16();        challenge17();        challenge18();        challenge19();    } }

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