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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）（一）

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

5.1

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, the input ends if it is 0: ");        int pos = 0;        int neg = 0;        double sum = 0;        int amo = 0;        while(true)        {
               int tmp = input.nextInt();            if(tmp==0)                break;            else            {
                   amo++;                sum+=tmp;                if(tmp>0)                    pos++;                else                    neg++;            }        }        double ave = sum/amo;        if(amo==0)            System.out.println("No numbers are entered except 0");        else {
               System.out.println("The number of positives is " + pos);            System.out.println("The number of negatives is " + neg);            System.out.println("The total is " + sum);            System.out.println("The average is " + ave);        }    }}

5.2

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
          final int NUMBER_OF_QUESTIONS=10;       int correctCount = 0;       int count = 0;       long startTime = System.currentTimeMillis();       String output="";       Scanner input = new Scanner(System.in);       while(count

5.3

public class book {
       public static void main(String[] args)    {
          System.out.println("千克         磅");       for(int i=1;i<=100;i++)           System.out.printf("%-6d%8.1f\n",i*2-1,(2*i-1)*2.2);    }}

5.4

public class book {
       public static void main(String[] args)    {
          System.out.println("英里        千米");       for(int i=1;i<=10;i++)           System.out.printf("%-11d%-6.3f\n",i,i*1.609);    }}

5.5

public class book {
       public static void main(String[] args)    {
          System.out.println("千克       磅      磅      千克");       for(int i=1;i<=100;i++)           System.out.printf("%-5d%8.1f     %-4d%8.2f\n",2*i-1,(2*i-1)*2.2,5*i+15,(5*i+15)/2.2);    }}

5.6

public class book {
       public static void main(String[] args)    {
          System.out.println("英里     千米     千米     英里");       for(int i=1;i<=10;i++)           System.out.printf("%-8d%-7.3f  %-8d%-6.3f\n",i,i*1.609,5*i+15,(5*i+15)/1.609);    }}

5.7

public class book {
       public static void main(String[] args)    {
          double ass = 10000;       for(int i=0;i<10;i++)           ass*=(1+0.05);       double oldAss = ass;       double sum = 0;       for(int i=0;i<4;i++)       {
              sum+=ass;           ass*=(1+0.05);       }       System.out.printf("Ass after 10 years is %.2f\n",oldAss);       System.out.printf("The total cost of 4 asses is %.2f\n",sum);    }}

5.8

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
          System.out.println("Enter the number of girls: ");       Scanner input = new Scanner(System.in);       int num = input.nextInt();       String name = "";       double cup = 0;       for(int i=0;i
   
    cup)           {
                  cup=tmp;               name=tname;           }       }       System.out.println("The hottest girl is "+name);    }}
   

5.9

import java.util.Scanner;public class book {
       public static void main(String[] args)    {
          System.out.print("Enter the number of girls: ");       Scanner input = new Scanner(System.in);       int num = input.nextInt();       String name = "";       String name2 = "";       double cup = 0;       double cup2 = 0;       for(int i=0;i
   
    cup)           {
                  cup2=cup;               name2 = name;               cup=tmp;               name=tname;           }           else if(tmp>cup2)           {
                  cup2=tmp;               name2=tname;           }       }       System.out.println("The hottest girl is "+name);       System.out.println("The second hottest girl is "+name2);    }}
   

5.10

public class book {
       public static void main(String[] args)    {
          int count=0;       int base = 0;       for(int i=100;i<=1000;i++)       {
              if(i%5==0&&i%6==0)           {
                  count++;               System.out.print(i+" ");           }           if(count%10==0&&count!=base) {
                  System.out.print("\n");               base+=10;           }       }    }}

5.11

public class book {
       public static void main(String[] args)    {
          int count=0;       int base = 0;       for(int i=100;i<=1000;i++)       {
              if(i%5==0^i%6==0)           {
                  count++;               System.out.print(i+" ");           }           if(count%10==0&&count!=base) {
                  System.out.print("\n");               base+=10;           }       }    }}

5.12

public class book {
       public static void main(String[] args)    {
          int n = 0;       while(n*n<12000)           n++;       System.out.println("The n is "+n);    }}

5.13

public class book {
       public static void main(String[] args)    {
           int n = 0;        while(n*n*n<12000)            n++;        System.out.println("The n is "+(n-1));    }}

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