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

public class practice_week7 {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a[] = {1,2,2,4,5,6,5,8,8,10};
        int q = 0;
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a.length; j++) {
                int temp = 0;
                if (a[i]>a[j]) {
                    temp=a[i];
                    a[j]=temp;
                    break;
                }
            }
        }
        a[0]=0;
        a[9]=0;
        for (int x = 0; x < a.length; x++) {
            q=a[x]+q;
        }
        q=q/8;
        System.out.println("平均分是：" + q);
    }

}

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。

import java.util.Random;

public class practice_week7 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] arr = new int[10];
        Random ran = new Random();
        System.out.println("产生的随机数组为：");
        for (int i = 0; i < arr.length; i++) {
            arr[i] = ran.nextInt(100);
            System.out.print(arr[i] + " ");
        }
        System.out.println();
        for (int i = 0; i < arr.length-1; i++) {
            for (int j = 0; j < arr.length-1-i; j++) {
                if (arr[j]>arr[j+1]) {
                    int temp = arr[j];
                    arr[j] = arr[j+1];
                    arr[j+1] = temp;
                }
            }
        }
        System.out.println("排序后输出结果为：");
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[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）

import java.util.Random;

public class practice_week7 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] a = new int[7];
        Random b = new Random();
        for (int i = 0; i < 7; i++) {
            a[i] = b.nextInt(35) + 1;
            for (int j = 0; j < i; j++) {
                if (a[j] == a[i]) {
                    i--;
                }
            }    
        }
        for (int i = 0; i < a.length; i++) {
            System.out.println("35选7的号码为：" + a[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

import java.util.Random;

public class practice_week7 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a[] = {1,2,3,4,5,6,7,8,9,10};
        int max = a[0];
        int min = a[0];
        int countQ = 0;
        int countO = 0;
        for (int i = 0; i < a.length; i++) {
            if (a[i]>max) {
                max = a[i];
            }
            if (a[i]<min) {
                min = a[i];
            }
            if (a[i]%2==0) {
                countQ += 1;
            }else {
                countO += 1;
            }
        }
        System.out.println("数组的最大值为：" + max);
        System.out.println("数组的最小值为：" + min);
        System.out.println("数组的偶数个数为：" + countO);
        System.out.println("数组的奇数个数为：" + countQ);
    }

}