《Java语言程序设计与数据结构》编程练习答案（第五章）（二）

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

5.14

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           System.out.print("Enter two integers: ");        Scanner input = new Scanner(System.in);        int n1 = input.nextInt();        int n2 = input.nextInt();        int jb = Math.min(n1,n2);        for(int i=jb;i>=1;i--)        {
               if(n1%i==0&&n2%i==0)            {
                   System.out.println("The gcd is "+i);                break;            }        }    }}

5.15

public class book {
       public static void main(String[] args)    {
           char ass = '!';        int count = 0;        while(ass<='~')        {
               System.out.print(ass+" ");            count++;            ass++;            if(count%10==0)                System.out.print("\n");        }    }}

5.16

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           Scanner input = new Scanner(System.in);        System.out.print("Enter an integer: ");        int ass = input.nextInt();        while(ass!=1)        {
               for(int i=2;i<=ass;i++)            {
                   if(ass%i==0)                {
                       ass=ass/i;                    System.out.print(i+" ");                    break;                }            }        }    }}

5.17

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           System.out.print("Enter the number of lines: ");        Scanner input = new Scanner(System.in);        int lines = input.nextInt();        for(int i=1;i<=lines;i++)        {
               for(int j=1;j<=7-i;j++)                System.out.print("  ");            for(int j=i;j>1;j--)                System.out.print(j+" ");            for(int j=1;j<=i;j++)                System.out.print(j+" ");            System.out.print('\n');        }    }}

5.18

public class book {
       public static void main(String[] args)    {
           for(int i=1;i<=6;i++)        {
               for(int j=1;j<=i;j++)                System.out.print(j+" ");            System.out.print('\n');        }        for(int i=1;i<=6;i++)        {
               for(int j=1;j<=7-i;j++)                System.out.print(j+" ");            System.out.print('\n');        }        for(int i=1;i<=6;i++)        {
               for(int j=1;j<=6-i;j++)                System.out.print("  ");            for(int j=i;j>=1;j--)                System.out.print(j+" ");            System.out.print('\n');        }        for(int i=1;i<=6;i++)        {
               for(int j=1;j<=i-1;j++)                System.out.print("  ");            for(int j=1;j<=7-i;j++)                System.out.print(j+" ");            System.out.print('\n');        }    }}

5.19

public class book {
       public static void main(String[] args)    {
           for(int i=0;i<8;i++)        {
               for(int j=1;j<=7-i;j++)                System.out.print("     ");            for(int j=0;j
   
    =0;j--)                System.out.printf("%5d",(int)(Math.pow(2,j)));            System.out.print('\n');        }    }}

5.20

public class book {
       public static void main(String[] args)    {
           int lineBase = 0;        int count = 0;        for(int i = 2;i <= 1000;i++)        {
               boolean isPrime = true;            for(int j = 2;j

5.21

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           Scanner input = new Scanner(System.in);        System.out.print("Loan Amount: ");        double amount = input.nextDouble();        System.out.print("Number of Years: ");        int years = input.nextInt();        System.out.println("Interest Rate      Monthly Payment      Total Payment");        for(int i = 0;i<25;i++)        {
               double rate = (0.125*i+5)/1200;            double monthMoney = amount*rate/(1-1/Math.pow(1+rate,years*12));            System.out.printf("%-4.3f%%             %-5.2f               %-7.2f\n",0.125*i+5,monthMoney,monthMoney*12*years);        }    }}

5.22

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
           Scanner input = new Scanner(System.in);        System.out.print("Loan Amount: ");        double amount = input.nextDouble();        System.out.print("Number of Years: ");        int years = input.nextInt();        System.out.print("Annual Interest Rate: ");        double annualRate = input.nextDouble();        double monthRate = annualRate/1200;        double monthPay = amount*monthRate/(1-1/(Math.pow(1+monthRate,12*years)));        double total = monthPay*years*12;        System.out.printf("Monthly Payment: %.2f\n",monthPay);        System.out.printf("Total Payment: %.2f\n",total);        System.out.println("Payment# Interest   Principle   Balance");        double balance = amount;        for(int i=1;i<=years*12;i++)        {
               double interest = monthRate*balance;            double principle = monthPay-interest;            balance = balance-principle;            System.out.printf("%d\t\t %.2f\t\t%.2f\t\t%.2f\n",i,interest,principle,balance);        }    }}

5.23

public class book {
       public static void main(String[] args)    {
           double l2r = 0;        double r2l = 0;        double base1 = 1.0;        double base2 =50000.0;        for(int i=1;i<=50000;i++)        {
               l2r+=1/base1;            base1+=1;        }        for(int i=1;i<=50000;i++)        {
               r2l+=1/base2;            base2-=1;        }        System.out.println("From left to right: "+l2r);        System.out.println("From right to left: "+r2l);    }}

5.24

public class book {
       public static void main(String[] args)    {
           double sum = 0;        for(int i =1;i<=97;i+=2)        {
               sum+=1.0*i/(i+2);        }        System.out.println("The answer is "+sum);    }}

5.25

public class book {
       public static void main(String[] args)    {
           double item = 0.0;        double sum = 0.0;        for(int i=10000;i<=100000;i+=10000)        {
               item = 1.0;            sum = 0.0;            for(int j=1;j<=i;j++)            {
                   sum+=1.0*item/(2*j-1);                item*=(-1);            }            System.out.printf("i=%d, pi=%f\n",i,sum*4);        }    }}

5.26

public class book {
       public static void main(String[] args)    {
           for(int i =10000;i<=100000;i+=10000)        {
               double item = 1.0;            double e = 1.0;            for(int j=1;j<=i;j++)            {
                   item/=j;                e+=item;            }            System.out.printf("i=%d, e=%f\n",i,e);        }    }}

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