Java大学基础教程(英文第六版)课后第四章自测题答案.doc

package my.p4;import java.util.Scanner;public class FractorialTest /* * param args */public static void main(String args) Scanner input = new Scanner(System.in);System.out.println(Input an integer:n);int inputnumber = input.nextInt();/*GetFactorial f = new GetFactorial();f.setInputn(inputnumber);int nn = f.getInputn();int factor = f.factoriall(nn);System.out.printf(The factorial of %d is %dnnn, nn, factor);*/double sum = 0;int counter = 0;int nn = 0;int n = 0;while (counter inputnumber) GetFactorial ff = new GetFactorial();ff.setInputn(+counter);nn = ff.getInputn();System.out.printf(Compute the factorial of number %d.n,ff.getInputn();n = ff.factoriall(nn);sum += (double)1/n; /*very important System.out.printf(The factorial of %d is %dn, nn, n);System.out.printf(nThe exponential approximation is: %.4f nn, sum);/System.out.printf(nIts exponential approximation is: %f , sum);package my.p4;public class GetFactorial private int counter;private int factorial;private int inputn;public GetFactorial() this.counter = 0;this.factorial = 1;this.inputn = 0;public int getInputn() return inputn;public void setInputn(int input) this.inputn = input;public int factoriall(int input) input = getInputn();while (+counter = input) factorial *= counter;return factorial;/P139_4$24package my.p4;public class Mystery2 public static void main(String args) int count = 1;while (count = 1) column = 1;/ P139_4$26while (column = 10) System.out.print(row % 2 = 1 ? );+column; / end while-row;System.out.println(); / end while / end main / end class Mystery2package my.p4;public class P135_4$5 /* * param args */public static void main(String args) / TODO Auto-generated method stubint x = 1;int sum = 0;sum += 1;System.out.printf(The sum is: %d, sum);/ sum 110int sum1 = 0,y=1;/*int y = 1;while (y = 10)sum1 += y;+y;/int sum, x, sum1;*/+sum1;System.out.printf(nThe sum is: %d, sum1);package my.p4;import java.util.Scanner;public class P136_4$17 public static void main(String args) Scanner input = new Scanner(System.in);int tanks = 0;double even;int gallons = 0;int miles = 0;int increasedpetrol;int increasedmiles; System.out.print(start the loop tangks = .n);while ( +tanks = 3 ) System.out.printf(tanks = %dn, tanks);System.out.print(input the petrol cost:);increasedpetrol = input.nextInt();gallons = gallons + increasedpetrol;System.out.print(input the miles past:);increasedmiles = input.nextInt();miles = miles + increasedmiles;even = (double) gallons / miles;System.out.printf(The total number of tank of petrol cost is %d, which means that %.2f gallon petrol were cost per mile.,tanks, even);package my.p4;import java.util.Scanner;public class P136_4$18 /* 注意花括号再多行中的作用，理解static关键字的含义 */public static void main(String args) Scanner input = new Scanner(System.in);int sn;int remainder;int total;int income;System.out.print(nInput the serial number:);sn = input.nextInt();if (sn = 1)System.out.println(nInput your income of this month:);income = input.nextInt();remainder = 1000;total = remainder + income;System.out.printf(the remainder of this month is %d,nAdd the income %d,nThe total of %d is %d,remainder, income, sn, total);System.out.print(ncheck out the CREDIT LIMITED.);checkCreditLmited(total);if (sn = 2)remainder = 600;System.out.println(nInput your income of this month:);income = input.nextInt();total = remainder + income;System.out.printf(the remainder of this month is %d,nAdd the income %d,nThe total of %d is %d,remainder, income, sn, total);System.out.print(ncheck out the CREDIT LIMITED.);checkCreditLmited(total);if (sn = 3)remainder = 500;System.out.println(nInput your income of this month:);income = input.nextInt();total = remainder + income;System.out.printf(the remainder of this month is %d,nAdd the income %d,nThe total of %d is %d,remainder, income, sn, total);System.out.print(ncheck out the CREDIT LIMITED.);checkCreditLmited(total); /public static void checkCreditLmited(int total) if (total = 500)System.out.print(n*YOU still have CREDIT*);System.out.printf(nYour credit is: %d, total - 500);package my.p4;import java.util.Scanner;public class P138_4$19 public static void main(String args) / TODO Auto-generated method stub Scanner input = new Scanner(System.in); int salarybase = 200;int salesamount1, salesamount2, salesamount3, salesamount4;double saleprice1 = 239.99, saleprice2 = 129.75, saleprice3 = 99.95, saleprice4 = 350.89;double totalsalary;System.out.print(Input the sales amount of FOUR types of products of a saler nn);System.out.print(input the sales amount of the first type of products of a saler: n);salesamount1 = input.nextInt();System.out.print(input the sales amount of the second type of products of a saler: n);salesamount2 = input.nextInt();System.out.print(input the sales amount of the third type of products of a saler: n);salesamount3 = input.nextInt();System.out.print(input the sales amount of the fourth type of products of a saler: n);salesamount4 = input.nextInt();System.out.print(nnnComputing his total salary.nnn);totalsalary = salarybase + (salesamount1 * saleprice1 +salesamount2 * saleprice2 + salesamount3 * saleprice3 + salesamount4 * saleprice4) * 0.09;System.out.printf(nThe total salary is %.2f, totalsalary);package my.p4;import java.util.Scanner;public class P139_4$20 /* 注意print类型问题 */public static void main(String args) / TODO Auto-generated method stubScanner input = new Scanner(System.in);String name = null, nameinput;int workinghour = 0;int counter = 1;double salary = 0;int salaryperhour = 10;while (counter 40) salary = (workinghour - 40) * salaryperhour / 2 + 40* salaryperhour;if (workinghour = 40) salary = workinghour * salaryperhour;System.out.printf(nnThe %dth worker %s working %d hours per week.nAnd his salary is %.2fnnn,counter, name, workinghour, salary);+counter;package my.p4;import java.util.Scanner;public class P139_4$21 /* * param args */public static void main(String args) / TODO Auto-generated method stubScanner input = new Scanner(System.in);int counter = 0;int number; / inputint largest = 0;int maxcounter = 0;while (+counter largest) largest = number;System.out.printf(The largest number is %d, largest);if (number = largest) maxcounter = counter;if (counter = 10)System.out.printf(the largest one of the ten number is %d,largest);System.out.printf(nthe %dth nuber is the largest, maxcounter);package my.p4;public class P139_4$22 public static void main(String args) / TODO Auto-generated method stubint counter = 0;System.out.print(Nt10*Nt100*Nt1000*Ntn);while (+counter = 5) System.out.printf(n%dt%dt%dt%dt, counter, 10 * counter,100 * counter, 1000 * counter);package my.p4;import java.util.Scanner;public class P139_4$23 /* * param args */public static void main(String args) / TODO Auto-generated method stubScanner input = new Scanner(System.in);int counter = 0;int number; / inputint largest = 0;int secondlargest = 0;int maxcounter = 0;int secondmaxcounter = 0;while (+counter largest) secondlargest = largest;largest = number;System.out.print(*);System.out.printf(nThe largest number is %d, largest);System.out.printf(nThe second largest number is %d, secondlargest);System.out.print(n*n);if (number = largest) maxcounter = counter;/*while (secondlargest = largest) secondmaxcounter = counter;*/if (number secondlargest)secondlargest = number;secondmaxcounter = counter;System.out.print(*);System.out.printf(nThe largest number is %d, largest);System.out.printf(nThe second largest number is %d, secondlargest);System.out.print(n*n);if (number 8)System.out.println( Raise Tuition);*/package my.p4;import java.util.Scanner;public class P141_4$29 /* * param args */public static void main(String args) Scanner input = new Scanner(System.in);int sidelength;/ int counter = 1;int row = 0;int column = 1;System.out.print(Input the sidelength of the