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 Svd;
public class bbt {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int arr[] = { 20, 40, 30, 10, 50, 60, 35, 25, 45, 15 };
        double a = 0;
        for (int i = 0; i < 10; i++) {
            for (int j = 0; j < 10; j++) {
                int b = 0;

                if (arr[i] > arr[j]) {
                    b = arr[i];
                    arr[i] = arr[j];
                    arr[j] = b;
                    break;
                }

            }

        }
        arr[0] = 0;
        arr[9] = 0;
        for (int x = 0; x < 10; x++) {
            a = arr[x] + a;

        }
        a = a / 8;

        System.out.println("平均分是:" + a);

    }

}

 

 

 

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 Svd;

import java.util.Random;

public class bbt {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] arr = new int[10];
        Random a = new Random();
        for (int i = 0; i < 10; i++) {
            arr[i] = a.nextInt(100);
        }
        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 b = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = b;
                }
            }
        }
        System.out.println("排序后输出的是:");
        for (int i = 0; i < 10; i++) {
            System.out.println(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）

 

package Svd;

import java.util.Random;

public class bbt {

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

import java.util.*;

public class bbt {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int max = 10;
        int min = 1;
        int a = 0;
        int b = 0;
        int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] > max) {
                max = arr[i];
            }
            if (arr[i] < min) {
                min = arr[i];
            }

        }
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] % 2 == 0) {
                a++;
            } else {
                b++;
            }
        }
        System.out.println("最大值：" + max);
        System.out.println("最小值：" + min);
        System.out.println("偶数出现的次数：" + a);
        System.out.println("奇数出现的次数：" + b);

    }
}