第六周作业

1.定义长度位5的整型数组,输入他们的值,用冒泡排序后输出.

 

package enen;
import java.util.Scanner;
 
public class  enen{
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入数组的值：");
        int[] a= new int[5];
        for(int i=0;i<a.length;i++) {
             a[i]=input.nextInt();
        }
           for (int i = 0; i < a.length-1; i++) {
               for (int j = 0; j < a.length-1-i; j++) {
               if(a[j] > a[j+1]){
                   int t=a[j];
                   a[j]= a[j+1];
                   a[j+1] = t;
                }
             }
           }
           System.out.println("冒号排序为：");
           for (int i=0;i<a.length;i++) {
               System.out.println(a[i]+" ");
           }
 
    }
}

 

 

2.定义数组{34,22,35,67,45,66,12,33},输入一个数a,查找在数组中是否存在,如果存在,输出下标,不存在输出"not found"

package enen;
import java.util.Scanner;
 
public class enen{
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        boolean  c=false;
        int[] x=new int[]{34,22,35,67,45,66,12,33};
        System.out.print("请输出一个数");
        int a=input.nextInt();
        for(int i=0;i<x.length;i++){
            if(x[i]==a){
                System.out.println("该数存在于数组中下标为"+i);
                 c=true;
            }
        } if(c==false){
            System.out.println("not found");
        }
 
    }
}

 

3.以矩阵的形式输出一个double型二维数组（长度分别为5、4，值自己设定）的值。

package enen;
import java.util.Scanner;
 
public class enen {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        double[][]arr={{2,8,3,9},{8,4,6,7},
                {11,22,88,66},{34,25,68,42},
                {78,54,93,42}};
        for(int i=0;i<arr.length;i++){
            System.out.println();
            for(int j=0;j<arr.length-1;j++){
                System.out.print(arr[i][j]+" ");
            }
        }
 
    }
}

 

4.定义一个二维数组(长度分别为3,4,值自己设定),求该二维数组的最大值.

package enen;
 
public class enen {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         int [][]a={{87,36,89,54},{7,64,25,46},{58,12,49,62}};
            int max=a[0][0];
            for(int i=0;i<3;i++){
                for(int j=0;j<4;j++){
                    if(a[i][j]>max){
                        max=a[i][j];
                    }
                }
 
            }
            System.out.println(max);
        }
 
    }