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《Java语言程序设计与数据结构》编程练习答案（第五章）（三）

英文名：Introduction to Java Programming and Data Structure, Comprehensive Version, 11th Edition

5.27

public class book {
       public static void main(String[] args)    {
           int count = 0;        int base = 0;        for(int i=101;i<=2100;i++)        {
               boolean isLeap = (i%4==0&&i%100!=0)||(i%400==0);            if(isLeap)            {
                   System.out.print(i+" ");                count++;                if(count%10==0&&count!=base)                {
                       System.out.print("\n");                    base+=10;                }            }        }        System.out.print('\n');        System.out.println("The total number is "+count);    }}

5.28

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           Scanner input = new Scanner(System.in);        String[] months = {
   "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};        System.out.print("Enter the year: ");        int year = input.nextInt();        String[] days={
   "Mon","Tue","Wed","Thu","Fri","Sat","Sun"};        int[] numDays = {
   31,28,31,30,31,30,31,31,30,31,30,31};        if((year%4==0&&year%100!=0)||(year%400==0))            numDays[1]=29;        System.out.print("Enter the day: ");        int day = input.nextInt();        for(int i=1;i<=12;i++)        {
               System.out.printf("%s 1, %d is %s\n", months[i - 1], year, days[day-1]);            day=(day+numDays[i-1])%7;            if(day==0)                day=7;        }    }}

5.29

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           Scanner input = new Scanner(System.in);        String[] months = {
   "Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};        System.out.print("Enter the year: ");        int year = input.nextInt();        String[] days={
   "Sun","Mon","Tue","Wed","Thu","Fri","Sat"};        int[] numDays = {
   31,28,31,30,31,30,31,31,30,31,30,31};        if((year%4==0&&year%100!=0)||(year%400==0))            numDays[1]=29;        System.out.print("Enter the day: ");        int day = input.nextInt();        for(int i=1;i<=12;i++)        {
               System.out.println("              "+months[i-1]+" "+year+"           ");            System.out.println("=======================================");            System.out.println("Sun   Mon   Tue   Wed   Thu   Fri   Sat");            int count = 0;            int base = 0;            for(int j=0;j

5.30

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           Scanner input = new Scanner(System.in);        System.out.print("Enter the money: ");        double money = input.nextDouble();        double plus = money;        System.out.print("Enter year rate: ");        double rate = input.nextDouble();        System.out.print("Enter the months: ");        int months = input.nextInt();        for(int i=1;i

5.31

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           Scanner input = new Scanner(System.in);        System.out.print("Enter the initial deposit amount: ");        double money = input.nextDouble();        System.out.print("Enter annual percentage yield: ");        double rate = input.nextDouble();        System.out.print("Enter maturity period (number of month): ");        int month = input.nextInt();        System.out.println("Month    CD Value");        for(int i=1;i<=month;i++)        {
               money*=(1+rate/1200);            System.out.printf("%2d      %.2f\n", i,money);        }    }}

5.32

public class book {
       public static void main(String[] args)    {
           int num1 = (int)(Math.random()*10);        int num2 = (int)(Math.random()*10);        while(num2==num1)            num2 = (int)(Math.random()*10);        System.out.println("The lottery number is "+num1+num2);    }}

5.33

public class book {
       public static void main(String[] args)    {
           for(int i=1;i<10000;i++)        {
               int sum=0;            for(int j=1;j

5.34

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           Scanner input = new Scanner(System.in);        int comWin = 0;        int manWin = 0;        String[] ass = {
   "stone","scissors","paper"};        while(comWin<=2&&manWin<=2)        {
               System.out.print("Enter 0 for stone, 1 for scissors, 2 for paper:");            int ren = input.nextInt();            int jizi = (int)(Math.random()*3);            if(jizi-ren==-1||jizi-ren==2)            {
                   System.out.println("Computer is "+ass[jizi]+", you are "+ass[ren]+". You lose!");                comWin++;            }            else if(ren-jizi==-1||ren-jizi==2)            {
                   System.out.println("Computer is "+ass[jizi]+", you are "+ass[ren]+". You win!");                manWin++;            }            else                System.out.println("Computer is "+ass[jizi]+", you are "+ass[ren]+". It is a draw.");        }    }}

5.35

public class book {
       public static void main(String[] args)    {
           double sum=0;        for(int i=625;i>=2;i--)            sum+=1.0/(Math.sqrt(i-1)+Math.sqrt(i));        System.out.println("The result is "+sum);    }}

5.36

见答案3.9

👨🐰🌶

5.37

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           Scanner input = new Scanner(System.in);        System.out.print("Enter a number: ");        int ass = input.nextInt();        int mi = 1;        while(Math.pow(2,mi)<=ass)            mi++;        mi--;        for(int i=mi;i>=0;i--)        {
               if(ass>=Math.pow(2,i))            {
                   System.out.print(1);                ass-=Math.pow(2,i);            }            else                System.out.print(0);        }    }}

5.38

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           Scanner input = new Scanner(System.in);        System.out.print("Enter a number: ");        int ass = input.nextInt();        int mi = 1;        while(Math.pow(8,mi)<=ass)            mi++;        mi--;        for(int i=mi;i>=0;i--)        {
               System.out.print((int)(ass/Math.pow(8,i)));            ass%=(int)(Math.pow(8,i));        }    }}

5.39

public class book {
       public static void main(String[] args)    {
           double sell = 0.0;        double earn = 5000;        while(earn<30000)        {
               sell++;            if(sell<=5000)                earn+=0.08;            else if(sell<=10000)                earn+=0.10;            else                earn+=0.12;        }        System.out.println("You must sell $"+sell+" at least.");    }}

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