第六次作业 第七周练习

1.有10个评委打分,(去掉一个最高一个最低)求平均分。

package calsswork;
import java.util.Scanner;
public class text1 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a[] = new int[10];
        double sum = 0;
        int b = 1;
        double c = 0;
        for (int i = 0; i < a.length; i++) {
            System.out.println("输入数组" );
            a[i] = sc.nextInt();
        }
        for (int x = 0; x < a.length - 1; x++) {
            for (int y = 0; y < a.length - 1 - x; y++) {
                if (a[y] > a[y + 1]) {
                    int temp = a[y + 1];
                    a[y + 1] = a[y];
                    a[y] = temp;
                }
            }
        }
        for (int n : a) {
            System.out.println(n + "、");
        }
         
        for (; b < a.length - 1; b++) {
            sum += a[b];
            c = sum / b;
        }
        System.out.println("平均数：" + c);
    }
}

2.自学一下Java随机数，生成一个长度为10的随机数组（每个数的范围是0~99），排序后输出。

package calsswork;
import java.util.Scanner;
public class text1 {
    public static void main(String[] args) {
        int arr[] = new int[10];
        Random r = new Random();
        for (int i = 0; i < arr.length; i++) {
            arr[i] = r.nextInt(100);
            System.out.print(arr[i] + ", ");
        }
        System.out.println();
        System.out.println("随机数开始排序！！！");
        for (int x = 0; x < arr.length - 1; x++) {
            for (int y = 0; y < arr.length - 1 - x; y++) {
                if (arr[y] > arr[y + 1]) {
                    int temp = arr[y + 1];
                    arr[y + 1] = arr[y];
                    arr[y] = temp;
                }
            }
 
        }
        for (int n : arr) {
            System.out.println(n + ", ");
        }
 
    }
 
}

3.制作彩票35选7程序。 （就是1~35随机生成7个不重复的数）

package calsswork;
import java.util.Random;
public class text1 {
    public static void main(String[] args) {
                int[] a= new int[35];
                Random r=new Random();
                for (int i = 0; i < a.length; i++) {
                    a[i]=r.nextInt(34)+1;
                }
                int[] b=new int[7];
                for (int j = 0; j < 7; j++) {
                    b[j]=a[r.nextInt(36)];
                }
                for (int i : b) {
                    System.out.print(i+"  ");
                }
            }
        }

4.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package calsswork;
import java.util.Scanner;
public class text1 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int arr[] = new int[10];
        int js = 0, os = 0;
        for (int i = 0; i < arr.length; i++) {
            System.out.println("请输入第" + (i + 1) + "个数：");
            arr[i] = sc.nextInt();
        }
        int max = arr[0], min = arr[0];
        for (int x = 1; x < arr.length; x++) {
            if (arr[x] > max) {
                max = arr[x];
            } 
            else if (arr[x] < min) {
                min = arr[x];
            }
        }
        for (int y = 0; y < arr.length; y++) {
            if (arr[y] % 2 == 0) {
                os++;
            } 
            else {
                js++;
            }
        }
        System.out.println("最大值为：" + max + "," + "最小值为：" + min);
        System.out.println("奇数个数为：" + js + "," + "偶数个数为：" + os);
    }
}