2020，4，9；

package ggd;
import java.util.*;

public class xcz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);

         System.out.println("请输入数组长度");
            int b= input.nextInt();
            int a[]=new int[b];
            System.out.println("请输入数组数据");
            for(int i=0;i<a.length;i++){
                a[i]=input.nextInt();
            }
            int t;
            for(int i=0;i<a.length/2;i++){
                t=a[i];
                a[i]=a[a.length-i-1];
                a[a.length-i-1]=t;
            }
            System.out.println("这个数组的逆序存放是");
            for(int i=0;i<a.length;i++) {
                System.out.print(a[i]+" ");
            }
        }

       }

   
    
    

    }

 

package ggd;

public class xcz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
         int []arr={18,25,7,36,13,2,89,63};
          int max =arr[0];
         int a =0;
         for(int i =1;i<arr.length;i++) {
             if(max < arr[i]) {
                 max = arr[i];
                 a=i;
             }
         }
         System.out.println("max="+max+"下标"+a);
       }

   
    
    

    }

 

package ggd;

public class xcz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
         int[] arr ={23,45,22,33,56};
         int sum=0,pjz;
         for(int i=0;i<=4;i++){
             sum+=arr[i];
             pjz=sum/5;
            System.out.println("和是"+sum+"平均值是"+pjz); 
         }
         
    
    }

    }

 

package ggd;

public class xcz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
         int[] arr = new int[5];
         arr[0]=10;
         arr[1]=20;
         arr[2]=30;
         arr[3]=40;
         arr[4]=50;
         for(int i =0;i<5;i++) {
             System.out.println(arr[i]);

    
    }

    }}

 

package ggd;

public class xcz {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
  int[] arr=new int[]{10,20,30,40,50};
        for (int i = 0; i < arr.length; i++) {
            System.out.println(arr[i]+" ");
        }

    }