第七周上机作业

1.有10个评委打分,(去掉一个最高一个最低)求平均分。

package day01;
import java.util.*;
public class test3 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input=new
		Scanner (System.in);
		int [] arr= new  int [10];
		int sum=0;
		System.out.println("请输入成绩");
		for (int i = 0; i < arr.length; i++) {
			System.out.print(i+1+":");
			arr[i]=input.nextInt();
			
		}
		for (int i = 0; i < arr.length; i++) {
			for (int j = 0; j < arr.length-i-1; j++) {
				
				if(arr[j]>arr[j+1]){
	                int h=arr[j];
	                arr[j]=arr[j+1];
	                arr[j+1]=h;
	                }
			}
		}
		
		for (int i = 1; i < 9; i++) {
			sum+=arr[i];
			
		}
		
		System.out.println("选手分数平均值为"+sum/8.0);
	}

}

　　

 

 

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 day01;
import java.util.Random;
public class yeah {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Random r=new Random ();
		int []arr=new  int [10];
		for (int i = 0; i < arr.length; i++) {
			arr[i]=r.nextInt(100);
		}
		for (int i = 0; i < arr.length; i++) {
			for (int j = 0; j < arr.length-i-1; j++) {
				if(arr[j]>arr[j+1]){
					int h=arr[j];
					arr[j]=arr[j+1];
					arr[j+1]=h;
				}
			}
		}
		for (int i = 0; i < arr.length; 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 day01;
import java.util.Random;
public class yeah {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Random r=new Random ();
		int []arr=new int [7];
		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(arr[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 day01;
import java.util.Random;
public class yeah {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Random r=new Random ();
		int []arr=new  int [10];
		for (int i = 0; i < arr.length; i++) {
			arr[i]=r.nextInt(100);
		}
		for (int i = 0; i < arr.length; i++) {
			System.out.print(arr[i]+" ");
		}
		int max=0,min=arr[0],jishu=0,oushu=0;
		for (int i = 0; i < arr.length; i++) {
			if(max<arr[i])
				max=arr[i];
		}
		for (int i = 0; i < arr.length; i++) {
			if(arr[i]<min)
				min=arr[i];
		}
		for (int i = 0; i < arr.length; i++) {
			if(arr[i]%2==0)
				oushu+=1;
			else
				jishu+=1;
		}
		System.out.println("max="+max+",min="+min+",奇数个数"+jishu+",偶数个数"+oushu);
	}

}