第六周课下作业

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 qq;

import java.util.Scanner;

public class Ee {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        int arr[]={29,14,56,36,48};
        for(int i=0;i<4;i++){
          for(int a=0;a<4-i;a++){
                if(arr[a]>arr[a+1]){
                int j=arr[a];
                arr[a]=arr[a+1];
                arr[a+1]=j; 
                }
        }
        
    }
        for(int i=0;i<5;i++){
            System.out.println(arr[i]);
        }
    }
}

2.定义数组

package qq;

import java.util.Scanner;

public class Ee {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        int arr[]={34,22,35,67,45,66,12,33};
        System.out.println("请输入一个数a:");
        int b=input.nextInt();    
        boolean yes=false;
        for(int i=0;i<arr.length;i++) {
            if(arr[i]==b) {
                System.out.println("数的下标为:"+i);
                yes=true;
        }                                        
            }
        if(yes==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 qq;

import java.util.Scanner;

public class Ee {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
    double arr[][]={{1,2,3,4},{5,6,7,8},{10,11,12,13},{14,15,16,17},{18,19,20,21}};
       for(int i=0;i<5;i++){
           for(int j=0;j<4;j++){
               System.out.print(arr[i][j]+"	");
           }
           System.out.println("");
       }              
        }  
}

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 qq;

import java.util.Scanner;

public class Ee {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        int max=0;
    int arr[][]={{1,2,3,4},{5,6,7,8},{10,11,12,13}};
       for(int i=0;i<3;i++){
           for(int j=0;j<4;j++){
               if(arr[i][j]>max){
                   max=arr[i][j];
               }
           }
         
       }  
       System.out.println("最大值为"+max);
        }  
}