《Java语言程序设计与数据结构》编程练习答案（第七章）（一）
2024-04-03 20:53:57
《Java语言程序设计与数据结构》编程练习答案（第七章）（一）
英文名：Introduction to Java Programming and Data Structures, Comprehensive Version, 11th Edition
New Site
7.1
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter the number of students: ");int num = input.nextInt();int[] scores = new int[num];int best = 0;System.out.print("Enter "+num+" scores: ");for(int i=0;i<num;i++){scores[i]=input.nextInt();if(scores[i]>best)best=scores[i];}char[] grades={'A','B','C','D'};for(int i=0;i<num;i++)System.out.printf("Student %d score is %d and grade is %c\n",i,scores[i],scores[i]==best?'A':grades[(best-scores[i]-1)/10]);}}7.2
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter ten integers: ");int[] nums = new int[10];for(int i=0;i<10;i++)nums[i]=input.nextInt();for(int i=9;i>=0;i--)System.out.print(nums[i]+" ");}}7.3
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);int[] counts = new int[101];for(int i=0;i<101;i++)counts[i]=0;System.out.print("Enter the integers between 1 and 100: ");while(true){int tmp=input.nextInt();counts[tmp]++;if(tmp==0)break;}for(int i=1;i<=100;i++){if(counts[i]!=0){if(counts[i]>1)System.out.printf("%d occurs %d times\n",i,counts[i]);elseSystem.out.printf("%d occurs 1 time\n",i);}}}}7.4
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);int[] occurs = new int[101];int sum=0;int count = 0;while(true){int tmp = input.nextInt();if(tmp<0)break;occurs[tmp]++;sum+=tmp;count++;}double avg = 1.0*sum/count;int lower = 0;for(int i=0;i<avg;i++){lower+=occurs[i];}System.out.println(lower+" students are lower than average.");System.out.println((count-lower)+" students are not lower than average.");}}7.5
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);int[] ass = new int[12];int ptr = 0;System.out.print("Enter 10 numbers: ");for(int i=0;i<10;i++){int tmp=input.nextInt();boolean in = false;for(int j=0;j<ptr;j++){if(ass[j]==tmp){in=true;break;}}if(!in){ass[ptr]=tmp;ptr++;}}System.out.println("The number of distinct number is "+ptr);System.out.print("The distinct numbers are: ");for(int i=0;i<ptr;i++)System.out.print(ass[i]+" ");}}7.6
public class book {public static void main(String[] args){int[] ass =new int[60];ass[0]=2;int count=1;while(true){if(count==50)break;else{int base = ass[count-1];while(true){base++;if(isPrime(base,ass,count)){ass[count]=base;count++;break;}}}}for(int i=0;i<count;i++)System.out.print(ass[i]+" ");}public static boolean isPrime(int num,int[] dicks,int count){boolean re = true;for(int i=0;i<count;i++){if(dicks[i]>Math.sqrt(num))break;if(num%dicks[i]==0){re = false;break;}}return re;}}7.7
public class book {public static void main(String[] args){int[] ass = new int[10];for(int i=0;i<100;i++)ass[(int)(Math.random()*10)]++;for(int i=0;i<10;i++)System.out.printf("%d occurs %d times\n",i,ass[i]);}
}7.8
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter 10 doubles: ");double[] ass = new double[10];for(int i=0;i<10;i++)ass[i]=input.nextDouble();System.out.println("The average is "+average(ass));}public static int average(int[] array){int sum = 0;int len = array.length;for (int value : array) sum += value;return sum/len;}public static double average(double[] array){double sum=0.0;int len = array.length;for(double ass : array) sum+=ass;return sum/len;}
}7.9
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter 10 doubles: ");double[] ass = new double[10];for(int i=0;i<10;i++)ass[i]=input.nextDouble();System.out.println("The minimum number is "+min(ass));}public static double min(double[] array){double ss = array[0];for (double v : array) {if (v < ss)ss = v;}return ss;}
}7.10
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter 10 doubles: ");double[] ass = new double[10];for(int i=0;i<10;i++)ass[i]=input.nextDouble();System.out.println("The lowest index is "+indexOfSmallestElement(ass));}public static int indexOfSmallestElement(double[] array){int ss = 0;for(int i=0;i<array.length;i++){if(array[i]<array[ss])ss=i;}return ss;}
}7.11
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter 10 doubles: ");double[] ass = new double[10];for(int i=0;i<10;i++)ass[i]=input.nextDouble();System.out.println("The mean is "+mean(ass));System.out.println("The standard deviation is "+deviation(ass));}public static double deviation(double[] x){double sum=0;double mean=mean(x);for(double v:x)sum+=Math.pow(v-mean,2);return Math.sqrt(sum/(x.length-1));}public static double mean(double[] x){double sum=0;for (double v : x) sum += v;return sum/x.length;}
}7.12
import java.util.Scanner;
public class book {public static void main(String[] args){Scanner input = new Scanner(System.in);System.out.print("Enter 10 doubles: ");double[] ass = new double[10];for(int i=0;i<10;i++)ass[i]=input.nextDouble();reverse(ass);for(double v:ass) System.out.print(v+" ");}public static double[] reverse(double[] ass){int len = ass.length;for(int i=0;i<len/2;i++){double tmp = ass[i];ass[i]=ass[len-i-1];ass[len-i-1]=tmp;}return ass;}
}7.13
public class book {public static void main(String[] args){System.out.println("The random number is "+getRandom(1,1,4,5,1,4,1,9,1,9,8,1,0));}public static int getRandom(int... numbers){int jb=(int)(Math.random()*54)+1;while(inArray(numbers,jb))jb=(int)(Math.random()*54)+1;return jb;}public static boolean inArray (int[] ass,int dick){for (int value : ass) {if (value == dick)return true;}return false;}
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