4.10 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.

 1 package lit;
 2 import java.util.Scanner;
 3 public class next1 {
 4     
 5      public static void main(String[] args){
 6             // TODO Auto-generated method stub
 7          int[] a=new int[5];
 8         Scanner input=new Scanner(System.in);
 9         System.out.println("输入五个数：");
10         for(int i=0;i<a.length;i++) 
11             a[i]=input.nextInt();
12          for (int i = 0; i < a.length-1; i++) {
13              for (int j = 0; j < a.length-1-i; j++) {
14              int x = 0;
15              if(a[j] > a[j+1]){
16                  x = a[j];
17                  a[j]= a[j+1];
18                  a[j+1] = x;
19               }
20            }
21          }
22          System.out.println("排序为：");
23          for(int i=0;i<a.length;i++) {
24              System.out.println(a[i]+"");
25          }
26      }
27  }

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"

 1 package lit;
 2 import java.util.Scanner;
 3 public class next1 {
 4     
 5      public static void main(String[] args){
 6             // TODO Auto-generated method stub
 7          Scanner input=new Scanner(System.in);
 8          int [] a= {34,22,35,67,45,66,12,33};
 9          System.out.println("输入a: ");
10          boolean x=false;
11          int b=input.nextInt();
12          for(int i=0;i<a.length;i++) {
13              if(a[i]==b) {
14                  System.out.println("在数组中存在"+"下标为: "+i);
15                  x=true;
16              }
17          }
18          if(x==false){
19                  System.out.println("not found");
20          
21          }
22      }
23 
24  }

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。

 1 package text;
 2 
 3 public class ZuoYe {
 4     public static void main(String[] args) {
 5         // TODO Auto-generated method stub
 6           double[][] a = {{1,2,3,4,5},{5,4,3,2,1},{0,9,8,7,6},{6,7,8,9,10},{16,17,18,19,20}};
 7             for(int i=0;i<4;i++) {
 8                 for(int j=0;j<5;j++) {
 9                     System.out.print(a[i][j]+"   ");         
10                 }
11                 System.out.println();
12             }
13         }
14     }

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.

 1 package text;
 2 
 3 public class ZuoYe {
 4     public static void main(String[] args) {
 5         // TODO Auto-generated method stub
 6            int [][]a={{37,26,52,9},{13,25,1,8},{74,28,47,65}};
 7             int max=0;
 8             for(int i=0;i<a.length;i++){
 9                 for(int j=0;j<a[i].length;j++){
10                     if(a[i][j]>max){
11                         max=a[i][j];
12                     }
13                 }
14 
15             }
16             System.out.println(max);
17         }
18     }