Word版可编辑-JAVA语言程序设计第8版第5章完整答案programmingrcises程序练习题答案完整版精心整理.docx

5_1public class Exercise01 public static void main(String args) final int PENTAGONAL_NUMBERS_PER_LINE = 10;final int PENTAGONAL_NUMBERS_TO_PRINT = 100;int count = 1;int n = 1;while (count = PENTAGONAL_NUMBERS_TO_PRINT) int pentagonalNumber = getPentagonalNumber(n);n+;if (count % PENTAGONAL_NUMBERS_PER_LINE = 0)System.out.printf(%-7dn, pentagonalNumber);elseSystem.out.printf(%-7d, pentagonalNumber);count+;public static int getPentagonalNumber(int n) return n * (3 * n - 1) / 2;5_2import java.util.Scanner;public class Exercise02 public static void main(String args) Scanner input = new Scanner(System.in);/Prompt the user to enter an integerSystem.out.print(Enter an interger: );long number = input.nextLong();System.out.println(The sum of the digits in + number + is + sumDigits(number);public static int sumDigits(long n) int sum = 0;long remainingN = n;do long digit = remainingN % 10;remainingN = remainingN / 10;sum += digit; while (remainingN != 0);return sum;第03题import java.util.Scanner;public class Exercise03 public static void main(String args) Scanner input = new Scanner(System.in);/Prompt the user to enter an integerSystem.out.print(Enter an integer: );int number = input.nextInt();/Display resultSystem.out.println(Is + number + a palindrome? + isPalindrome(number);public static boolean isPalindrome(int number) if (number = reverse(number)return true;elsereturn false;public static int reverse(int number) int reverseNumber = 0;do int digit = number % 10;number = number / 10;reverseNumber = reverseNumber * 10 + digit; while (number != 0);return reverseNumber;第04题import java.util.Scanner;public class Exercise04 public static void main(String args) Scanner input = new Scanner(System.in);/Prompt the user to enter an integerSystem.out.print(Enter an integer: );int number = input.nextInt();/Display resultSystem.out.print(The reversal of + number + is );reverse(number);public static void reverse(int number) int reverseNumber = 0;do int digit = number % 10;number = number / 10;reverseNumber = reverseNumber * 10 + digit; while (number != 0);System.out.println(reverseNumber);第05题import java.util.Scanner;public class Exercise05 public static void main(String args) Scanner input = new Scanner(System.in);/Prompt the user to enter three numbersSystem.out.print(Enter three numbers: );double num1 = input.nextDouble();double num2 = input.nextDouble();double num3 = input.nextDouble();System.out.print(num1 + + num2 + + num3 + in increasing order: );displaySortedNumbers(num1, num2, num3);public static void displaySortedNumbers(double num1, double num2, double num3) double max = Math.max(Math.max(num1, num2), num3);double min = Math.min(Math.min(num1, num2), num3);double second = 0;if (num1 != max & num1 != min)second = num1;if (num2 != max & num2 != min)second = num2;if (num3 != max & num3 != min)second = num3;System.out.println(min + + second + + max);56import java.util.Scanner;public class Exercise06 public static void main(String args) Scanner input = new Scanner(System.in);/Prompt the user to enter an integerSystem.out.print(Enter an integer: );int number = input.nextInt();displayPattern(number);public static void displayPattern(int n) int i;int j;for (i = 1; i = n; i+) for (j = 0; j n - i; j+)System.out.print( );for (j = 0; j = i - 1; j+)System.out.printf(%-5d, i - j);System.out.println();5.7import java.util.Scanner;public class Exercise07 public static void main(String args) Scanner input = new Scanner(System.in);/Prompt the user to enter investment amountSystem.out.print(Enter the investment amount: );double investmentAmount = input.nextDouble();/Prompt the user to enter interest rateSystem.out.print(Enter the annual interest rate: );double annualInterestRate = input.nextDouble();/Prompt the user to enter yearsSystem.out.print(Enter number of years: );int years = input.nextInt();System.out.println(nThe amount invested: + investmentAmount);System.out.println(Annual interest rate: + annualInterestRate + %);System.out.println(YearstFuture Value);for (int i = 1; i = 31 & fahrenheit = 30; celsius-, fahrenheit -= 10) System.out.println(celsius + t + (int)(celsiusToFahrenheit(celsius) * 100) / 100.0 + tt + fahrenheit + tt + (int)(fahrenheitToCelsius(fahrenheit) * 100) / 100.0);public static double celsiusToFahrenheit(double celsius) return (9.0 / 5) * celsius + 32;public static double fahrenheitToCelsius(double fahrenheit) return (fahrenheit - 32) * 5.0 / 9;5.9public class Exercise09 public static void main(String args) System.out.println(FeettMeterstMeterstFeet);for (double feet = 1, meters = 20; feet = 10 & meters = 65; feet+, meters += 5) System.out.println(feet + t + (int)(footToMeter(feet) * 1000) / 1000.0 + t + meters + t + (int)(meterToFoot(meters) * 1000) / 1000.0);public static double footToMeter(double foot) return foot * 0.305;public static double meterToFoot(double meter) return meter / 0.305;5.10public class Exercise10 public static void main(String args) int count = 0;int number = 1;for (number = 1; number 10000; number+) if (isPrime(number)count+;System.out.println(The number of prime numbers less than 10000 is + count);public static boolean isPrime(int number) for (int i = 2; i = number / 2; i+) if (number % i = 0)return false;return true;5.11public class Exercise11 public static void main(String args) System.out.println(Sales AmounttCommission);for (double salesAmount = 10000.0; salesAmount = 100000; salesAmount += 5000) System.out.println(salesAmount + tt + computeCommission(salesAmount);public static double computeCommission(double salesAmount) if (salesAmount = 5000)return salesAmount * 0.08;else if (salesAmount = 10000)return 5000 * 0.08 + (salesAmount - 5000) * 0.10;elsereturn 5000 * 0.08 + (10000 - 5000) * 0.10 + (salesAmount - 10000) * 0.12;5.12public class Exercise12 public static void main(String args) char ch1 = 1;char ch2 = Z;int number = 10;printChars(ch1, ch2, number);public static void printChars(char ch1, char ch2, int numberPerLine) int count = 1;for (char i = ch1; i = ch2; i+) if (count % numberPerLine = 0)System.out.println(i);elseSystem.out.print(i + );count+;5.13public class Exercise13 public static void main(String args) System.out.println(itm(i);for (int i = 1; i = 1; i-)sum += i / (i + 1);return sum;5.14public class Exercise14 public static void main(String args) System.out.println(itm(i);for (int i = 10; i = 0; i -= 2) sum += 4 * (1 / (2 * i + 1) - 1 / (2 * (i + 1) + 1);return sum;5.15public class Exercise15 public static void main(String args) System.out.println(Taxble Single Married Married Head of);System.out.println(Income Joint Separate a House);int taxableIncome;int status;for (taxableIncome = 50000; taxableIncome = 60000; taxableIncome += 50) System.out.printf(%-5d, taxableIncome);System.out.print( );for (status = 0; status = 3; status+) System.out.printf(%-5d, (int)computetax(status, taxableIncome);System.out.print( );System.out.println();public static double computetax(int status, double taxableIncome) double tax = 0;double income = taxableIncome;if (status = 0) if (income = 8350)tax = income * 0.10;else if (income = 33950)tax = 8350 * 0.10 + (income - 8350) * 0.15;else if (income = 82250)tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (income - 33950) * 0.25;else if (income = 171550)tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (82250 - 33950) * 0.25 + (income - 82250) * 0.28;else if (income = 372950)tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (82250 - 33950) * 0.25 + (171550 - 82250) * 0.28 + (income - 171550) * 0.33;elsetax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (82250 - 33950) * 0.25 + (171550 - 82250) * 0.28 + (372950 - 171550) * 0.33 + (income - 372950) * 0.35;else if (status = 1) if (income = 16700)tax = income * 0.10;else if (income = 67900)tax = 16700 * 0.10 + (income - 16700) * 0.15;else if (income = 137050)tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + (income - 67900) * 0.25;else if (income = 208850)tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + (137050 - 67900) * 0.25 + (income - 137050) * 0.28;else if (income = 372950)tax = 16700 * 0.10 + (67900 - 16700) * 0.15 + (137050 - 67900) * 0.25 + (208850 - 137050) * 0.28 + (income - 208850) * 0.33;elsetax = 16700 * 0.10 + (67900 - 16700) * 0.15 + (137050 - 67900) * 0.25 + (208850 - 137050) * 0.28 + (372950 - 208850) * 0.33 + (income - 372950) * 0.35;else if (status = 2) if (income = 8350)tax = income * 0.10;else if (income = 33950)tax = 8350 * 0.10 + (income - 8350) * 0.15;else if (income = 68525)tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (income - 33950) * 0.25;else if (income = 104425)tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (68525 - 33950) * 0.25 + (income - 68525) * 0.28;else if (income = 186475)tax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (68525 - 33950) * 0.25 + (104425 - 68525) * 0.28 + (income - 104425) * 0.33;elsetax = 8350 * 0.10 + (33950 - 8350) * 0.15 + (68525 - 33950) * 0.25 + (104425 - 68525) * 0.28 + (186475 - 104425) * 0.33 + (income - 186475) * 0.35;else if (status = 3) if (income = 11950)tax = income * 0.10;else if (income = 45500)tax = 11950 * 0.10 + (income - 11950) * 0.15;else if (income = 117450)tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + (income - 45500) * 0.25;else if (income = 190200)tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + (117450 - 45500) * 0.25 + (income - 117450) * 0.28;else if (income = 372950)tax = 11950 * 0.10 + (45500 - 11950) * 0.15 + (117450 - 45500) * 0.25 + (190200 - 117450) * 0.28 + (income - 190200) * 0.33;elsetax = 11950 * 0.10 + (45500 - 11950) * 0.15 + (117450 - 45500) * 0.25 + (190200 - 117450) * 0.28 + (372950 - 190200) * 0.33 + (income - 372950) * 0.35;return tax;5.16public class Exercise16 public static void main(String args) for (int year = 2000; year = 2010; year+) System.out.println(Year + year + has + numberOfDaysInAYear(year) + days.);public static int numberOfDaysInAYear(int year) if (isLeapYear(year)return 366;elsereturn 365;public static boolean isLeapYear(int year) boolean isLeapYear = false;if (year % 4 = 0 & year % 100 != 0) | year % 400 = 0)isLeapYear = true;return isLeapYear;5.17import java.util.Scanner;public class Exercise17 public static void main(String args) Scanner input = new Scanner(System.in);System.out.print(Enter an integer number: );int n = input.nextInt();printMatrix(n);public static void printMatrix(int n) for (int i = 1; i = n; i+) for (int j = 1; j = n; j+)System.out.print(int)(Math.random() * 2) + );System.out.println();5.18public class Exercise18 public static void main(String args) System.out.println(NumbertSquareRoot);for (int i = 0; i side3 & side1 + side3 side2 & side2 + side3 side1)isValid = true;return isValid;/* * Returns the area of the triangle */public static double area(double side1, double side2, double side3) double s = (side1 + side2 + side3) / 2;double area = Math.sqrt(s * (s - side1) * (s - side2) * (s - side3);return area;5.20public class Exercise20 public static void main(String args) System.out.println(Degree tSin tCos);for (int degree = 0; degree 0.0001) lastGuess = nextGuess;nextGuess = (lastGuess + (n / lastGuess) / 2;return nextGuess;5.23public class Exercise23 public static void main(String args) final int NUMBERS_PER_LINE = 10;int count = 1;for (int i = 0; i 100; i+) if (count % NUMBERS_PER_LINE != 0)System.out.print(com.jackfangqi.chapter05.examples.RandomCharacter.getRandomUpperCaseLetter() + );if (count % NUMBERS_PER_LINE = 0)System.out.println(com.jackfangqi.chapter05.examples.RandomCharacter.getRandomUpperCaseLetter();count+;count = 1;for (int i = 0; i 100; i+) if (count % NUMBERS_PER_LINE != 0)System.out.print(com.jackfangqi.chapter05.examples.RandomCharacter.g