Java语言程序设计-基础篇-第八版-编程练习题-第六章

 1 package 编程练习题chapter6;
 2 import java.util.Scanner;
 3 public class Exercise6_01Extra {
 4     public static void main(String[] args){
 5         Scanner input = new Scanner(System.in);
 6         boolean[] isCovered = new boolean[99];
 7         
 8         int number = input.nextInt();
 9         while (number != 0){
10             if(number >= 0 && number <= 99)
11                 isCovered[number -1] = true;
12             number = input.nextInt();
13         }
14         
15         boolean allCovered = true;
16         for (int i = 0; i < 99; i++)
17             if (!isCovered[i]) {
18                 System.out.print((i + 1) + " ");
19                 allCovered = false;
20             }
21         
22         if (allCovered)
23             System.out.println("The tickets cover all numbers.");
24         else
25             System.out.print(" are the missing numbers.");
26     }
27 }

 1 package 编程练习题chapter6;
 2 
 3 public class Exercise6_1 {
 4     public static void main(String[] args){
 5         java.util.Scanner input = new java.util.Scanner(System.in);
 6         System.out.print("Enter number of students: ");
 7         int numberOfStudents = input.nextInt(); //获得stu数目.
 8         
 9         int[] scores = new int[numberOfStudents];//声明一个int型的scores数组，内容为numberOfStudents.
10         int best = 0;
11         char grade; 
12         
13         System.out.print("Enter " + numberOfStudents + " scores: ");
14         for (int i = 0; i < scores.length; i++) {  //i = 0~3
15             scores[i] = input.nextInt();           //分别存入scores[0]~scores[3]
16             
17             if (scores[i] > best)    
18                 best = scores[i];                //scores[i]大于0正确的输入值，则将值给best.
19         }
20         
21         String output = "";
22         
23         for (int i = 0; i < scores.length; i++) {
24             if (scores[i] >= best - 10)               
25                 grade = 'A';
26             else if (scores[i] >= best - 20)
27                 grade = 'B';
28             else if (scores[i] >= best - 30)
29                 grade = 'C';
30             else if (scores[i] >= best - 40)
31                 grade = 'D';
32             else
33                 grade = 'F';
34             
35             output += "Student " + i + " score is " +
36              scores[i] + " and grade is " + grade + "\n";
37         }
38         
39         System.out.println(output);
40     }
41 }

 1 package 编程练习题chapter6;
 2 
 3 public class Exercise6_2 {
 4     public static void main(String[] args){
 5         java.util.Scanner input = new java.util.Scanner(System.in);
 6         System.out.print("Read a number: ");
 7         
 8         int[] num = new int[10];
 9         
10         for (int i = 0; i < 10; i++) {
11             num[i] = input.nextInt();
12         }
13         
14         for (int i = 9; i >= 0; i--) {
15             System.out.print(num[i] + " ");
16         }
17     }
18 
19 }

 1 package 编程练习题chapter6;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Exercise6_3 {
 6     public static void main (String[] args) {
 7         Scanner input = new Scanner(System.in);
 8         int[] counts = new int[100];
 9         
10         System.out.print("Enter the integers between 1 and 100: ");
11         int number = input.nextInt();
12         
13         while (number != 0) {
14             counts[number - 1]++;
15             number = input.nextInt();
16         }
17         
18         for (int i = 1; i < 100; i++) {
19             if (counts[i] > 0)
20                 System.out.println((i + 1) + " occurs " + counts[i]
21                         + ((counts[i] == 1) ? " time" : " times"));
22         }
23     }
24 }

 1 package 编程练习题chapter6;
 2 
 3 public class Exercise6_4 {
 4     public static void main(String[] args){
 5         java.util.Scanner input = new java.util.Scanner(System.in);
 6         
 7         double[] scores = new double[10];
 8         double sum = 0;
 9         int count = 0;
10         
11         do{
12             System.out.print("Enter a new score: ");
13             scores[count] = input.nextDouble();
14             if (scores[count] >= 0) 
15                 sum += scores[count];                
16          } while (scores[count++] >= 0);
17         
18         System.out.println("count is " + count);
19         double average = (sum) / (count - 1);
20         
21         int numOfAbove = 0;
22         int numOfBelow = 0;
23         for (int i = 0; i < count - 1; i++)
24             if (scores[i] >= average)
25                 numOfAbove++;
26             else
27                 numOfBelow++;
28         
29         System.out.println("Average is " + average);
30         System.out.println("Number of scores above or equal to the average " + numOfAbove);
31         System.out.println("Number of scores below the average " + numOfBelow);
32     }
33 }

 1 package 编程练习题chapter6;
 2 
 3 public class Exercise6_5 {
 4     public static void main(String[] args){
 5         int[] numbers = new int[3];
 6         int numberOfDistinctValues = 0;
 7         
 8         java.util.Scanner input = new java.util.Scanner(System.in);
 9         System.out.print("Enter " + numbers.length + " numbers: ");
10         
11         for (int i = 0; i < numbers.length; i++) {
12             int value = input.nextInt();
13             
14             boolean isInTheArray = false;
15           
16             for (int j = 0; j < numberOfDistinctValues; j++) {  
17                 if (numbers[j] == value) {
18                     isInTheArray = true;    
19                 }
20                 else
21                     isInTheArray = false;
22             }
23                             
24             if (isInTheArray == false) {
25                 numbers[numberOfDistinctValues] = value;
26                 numberOfDistinctValues++;
27             }
28             
29         }
30         
31         System.out.println("The number of distinct values is " +
32             numberOfDistinctValues);
33         for (int i = 0; i < numberOfDistinctValues; i++)
34             System.out.print(numbers[i] + " ");
35     }
36 
37 }

 1 package 编程练习题chapter6;
 2 
 3 public class Exercise6_7 {
 4     public static void main(String[] args) {
 5         int[] counts = new int[10];
 6         
 7         for (int i = 0; i < 100; i++) {
 8             int value = (int)(Math.random() * 10);
 9             counts[value]++;
10         }
11         
12         for (int i = 0; i < counts.length; i++) {
13             System.out.println("Counts for " + i + " is " + counts[i]);
14         }
15     }
16 }

 1 package 编程练习题chapter6;
 2 
 3 public class Exercise6_8 {
 4     public static void main (String[] args) {
 5         int[] list1 = {1, 2, 3, 4, 5, 6};
 6         double[] list2 = {6.0, 4.4, 1.9, 2.9, 3.4, 3.5};
 7         
 8         System.out.println(average(list1));
 9         System.out.println(average(list2));
10     }
11     
12     public static int average(int[] array) {
13         int sum = 0;
14         for (int i = 0; i < array.length; i++) {
15             sum += array[i];
16         }        
17         
18         
19         return sum / array.length;
20     }
21     
22     public static double average(double[] array) {
23         double sum = 0;
24         for (int i = 0; i < array.length; i++) {
25             sum += array[i];            
26         }
27         
28         
29         return sum / array.length;
30     }
31 }

package 编程练习题chapter6;

public class Exercise6_9 {
    public static void main (String[] args) {
        double[] numbers = new double[10];
        
        java.util.Scanner input = new java.util.Scanner(System.in);
        System.out.print("Enter 10 double numbers: ");
        
        for (int i = 0; i < numbers.length; i++) {
            numbers[i] = input.nextDouble();
        }
        System.out.println("The min is " + min(numbers));
    }
    
    public static double min (double[] list) {
        double min = list[0];
        
        for (int i = 1; i < list.length; i++) 
                if (list[i] < min) min = list[i];
        
        return min;
    }
}

 1 package 编程练习题chapter6;
 2 
 3 public class Exercise6_10 {
 4     public static void main (String[] args) {
 5         double[] numbers = new double[10];
 6         
 7         java.util.Scanner input = new java.util.Scanner(System.in);
 8         System.out.print("Enter 10 numbers: ");
 9         
10         for (int i = 0; i < numbers.length; i++) {
11             numbers[i] = input.nextDouble();
12     }
13         System.out.println("The indes of the min is " +
14          indexOfSmallestElement(numbers));
15     }
16     
17     public static int indexOfSmallestElement(double[] list) {
18         double min = list[0];
19         int minIndex = 0;
20         
21         for (int i = 0; i < list.length; i++)
22             if (list[i] < min) {
23                 min = list[i];
24                 minIndex = i;
25             }
26         
27         return minIndex;
28     }    
29 }

posted on 2013-02-03 20:31 bailun 阅读(3748) 评论(0) 编辑收藏举报

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Java语言程序设计-基础篇-第八版-编程练习题-第六章

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