第七周上机练习

1.有10个评委打分,(去掉一个最高一个最低)求平均分。

package first;

public class three {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double []a=new double[] {9.1,10,8.2,9.5,6.7,6.6,4.2,5.5,6.6,7.7};
        double max=0.0;
        double min=0.0;
        double sum=0.0;
        double everage=0.0;
        for(int i=0;i<a.length-1;i++) {
            if(a[i+1]>a[i]) {
                max=a[i];
                a[i]=a[i+1];
                a[i+1]=max;
            }
        }
        for(int j=0;j<a.length-1;j++) {
            if(a[j+1]<a[j]) {
                min=a[j];
                a[j]=a[j+1];
                a[j+1]=min;
            }    
            sum=sum+a[j];
        }
        everage=(sum-min-max)/(a.length-2);
        System.out.println("最高得分为："+max+"最低得分为："+min+"平均分为："+everage);
    }
}

　　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 first;

import java.util.Random;

public class three{

    public static void main(String[] args) {
        // TODO Auto-generated method stub
          int[] a = new int[10];
            Random r=new Random();
            for (int i = 0; i < a.length; i++) {
                a[i]=r.nextInt(100);
            }
            int t;
            for (int i = 0; i < a.length - 1; i++) {
                for (int j = 0; j < a.length-1-i; j++) {
                    if (a[j + 1] > a[j]) {
                        t = a[j];
                        a[j] = a[j + 1];
                        a[j + 1] = t;
                    }
                }
            }
            for (int i : a) {
                System.out.println(i);
            }

        }
    }

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 first;

import java.util.Random;

public class three
 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
                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(如果没有特殊说明,静态赋值动态赋值都可以),统计数组中的最大值、最小值、以及奇 数和偶数的个数

package first;

public class three {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
             int[] a = new int[]{44,33,22,11,55,66,77,88,99,67};
            int max=a[0];
            int min=a[0];
            int js=0;
            int os=0;
            for (int i = 1; i <a.length ; i++) {
                if (a[i]>max){
                    max=a[i];
                }
            }
            for (int j = 1; j <a.length ; j++) {
                if (a[j]<min){
                    min=a[j];
                }
            }
            for (int k = 0; k< a.length; k++) {
                if (a[k]%2==0){
                    os+=1;
                }else {
                    js+=1;
                }
            }
            System.out.println("最大值为"+max+"最小值为"+min+"偶数有"+os+"个"+"奇数有"+js+"个");
        }
    }