第六周作业

1.定义长度为5的整型数组,输入他们的值,用冒泡排序后输出

package number6;

import java.util.Scanner;

public class cvb {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[] num = new int[5];
        Scanner input = new Scanner(System.in);
        for (int i = 0; i < num.length; i++) {
            System.out.print("请输入第" + (i + 1) + "个数:");
            num[i] = input.nextInt();
        }
        for (int i = 0; i < num.length - 1; i++) {
            for (int j = 0; j < num.length - 1 - i; j++) {
                if (num[j] > num[j + 1]) {
                    int temp = num[j];
                    num[j] = num[j + 1];
                    num[j + 1] = temp;
                }
            }
        }
        for (int i = 0; i < num.length; i++) {
            System.out.print(num[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 number6;

import java.util.Scanner;

public class cvb {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int [] a = {34,22,35,67,45,66,12,33};
        Scanner input = new Scanner(System.in);
        System.out.println("请输入要查找的数字:");
        int b = input.nextInt();
        for (int i = 0; i < a.length; i++) {
            if(b == a[i]) {
                System.out.println("数字" + b + "的下标是：" + i);
                return;
            }
        }
        System.out.println("not found");
        return;

         
    }

}




    

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 number6;

import java.util.Scanner;

public class cvb {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double[][] a = {{1, 2, 3, 4}, {2, 3, 4, 5}, {3, 4, 5, 6}, {4, 5, 6, 7}, {5, 6, 7, 8}};
        for (int i = 0; i < a.length; i++) {
            System.out.println();
            for (int j = 0; j < a[i].length; j++) {
                System.out.print(a[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 number6;

import java.util.Scanner;

public class cvb {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int[][] a = {{1, 1, 1, 1}, {24, 9, 6, 30}, {9, 5, 1, 12}};
        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("最大值为" + max);
         
    }

}