第六周上机

1.编写一个简单程序,要求数组长度为5,静态赋值10,20,30,40,50,在控制台输出该数组的值

package work;

public class abcd {

    public static void main(String[] args) {
        int [] qwq = new int [5];
        for(int i =0;i<5;i++){
        qwq [i] = i*10+10;
        System.out.print(qwq[i]+" ");
        }
    }
}

2.编写一个简单程序,要求数组长度为5,动态赋值10,20,30,40,50,在控制台输出该数组的值

package work;

import java.util.Scanner;

public class abcd {

    private static Scanner sc;

    public static void main(String[] args) {
        sc = new Scanner(System.in);
        int[] qwq=new int[5];
        for (int i = 0; i < qwq.length; i++) {
            qwq[i] = sc.nextInt();
        }
        for (int a : qwq) {
            System.out.println(a);
        }
    } 
}

3.编写一个简单程序,定义整型数组,里面的元素是{23,45,22,33,56},求数组元素的和、平均值

package work;

public class abcd {

    public static void main(String[] args) {
        int [] qwq = new int[]{23,45,22,33,56};
        int sum=0,pj=0;
        for (int i = 0; i < qwq.length; i++) {
        sum+=qwq[i];
        }
        System.out.println("和是");
        System.out.println(sum);
        pj=sum/5;
        System.out.println("平均值是");
        System.out.println(pj);
        }         
}

4.在一个有8个整数(18,25,7,36,13,2,89,63)的数组中找出其中最大的数及其下标。

package work;

public class abcd {

    public static void main(String[] args) {
        int[] arr={18,25,7,36,13,2,89,63};
        int max=arr[0];
        int index = 0;
         for (int i = 0; i < arr.length-1; i++) {
             if (max<arr[i+1]){
                 max=arr[i+1];
             index=i+1;
             }
         }
         System.out.println("最大值为;"+max+"下标为"+index);
    }
    }

5. 将一个数组中的元素逆序存放

package work;

public class abcd {

    public static void main(String[] args) {
          int [] a = new int [] {4,1,3,5,9,2,1};
          int t;
          for(int i = 0; i < a.length / 2; i ++) {
              t = a[i];
              a[i] = a[a.length - 1 - i];
              a[a.length - 1 - i] = t;
          }
          for(int i = 0; i < a.length; i ++) {
              System.out.print(a[i] + " ");
          }}
}

 

 

 

posted @ 2020-04-09 12:04  王立晓  阅读(...)  评论(...编辑  收藏