第八次作业

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 mjm;

import java.util.Scanner;
public class ddd {
     public static void main(String[] args) {
    
                 int[] a = new int[5];
                 int i, j;
                 int temp;
                 Scanner input = new Scanner(System.in);
                 System.out.println("请输入5个整数:");
                 for (i = 0; i < 5; i++) {
                     a[i] = input.nextInt();
                 }
                 for (i = 0; i < a.length - 1; i++) {
                     for (j = 0; j < a.length - 1 - i; j++) {
                         if (a[j] > a[j + 1]) {
                             temp = a[j];
                             a[j] = a[j + 1];
                             a[j + 1] = temp;
                         }
                     }
                 }
                 System.out.println("排序后:");
                 for (i = 0; i < a.length; i++) {
                     System.out.println(a[i] + "\t");
                 }
             }
         

}

 

 

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 mjm;

import java.util.Scanner;
public class ddd {
      public static void main(String[] args) {
           Scanner input=new Scanner(System.in);
            int[] x={34,22,35,67,45,66,12,33};
            System.out.println("请输入一个数:");
            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);
                }else{
                    System.out.println("not found");
                }break;
            }

 

        }
    }

 

 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 mjm;

import java.util.Scanner;
public class ddd {
      public static void main(String[] args) {
              double arr[][] = { { 1, 2, 3, 4, 5 }, { 6, 7, 8, 9, 10 },
                           { 11, 12, 13, 14, 15 }, { 16, 17, 18, 19, 20 } };
                    for (int i = 0; i < arr.length; i++) {
                        for (int j = 0; j < arr[i].length; j++) {
                            System.out.print(arr[i][j] + "\t");
                        } 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 mjm;

import java.util.Scanner;
public class ddd {
      public static void main(String[] args) {
          int a[][] = {{1,6,8,9}, {1,3,1,3,}, {4,5,6,2,}};
          int max = a[0][0];
          for (int i = 0; i < a.length; i++) {
              for (int j = 0; j < a[i].length; j++) {
                  if (a[i][j] > max) {
                      max = a[i][j];
                          }
                      }
                  }
                  System.out.println("最大值=" + max);
              }
      }