第四次作业

//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 homework4;

import java.util.Scanner;

public class Code1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		int[] a = new int[5];
        Scanner input = new Scanner(System.in);
        System.out.print("请输入5位数数组:");
        for (int i = 0; i < 5; 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.print("排序输出:");
        for (int i = 0; i < a.length; i++) {
            System.out.print(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 homework4;

import java.util.Scanner;

public class Code2 {

	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.print("输入一个数：");
        int i = input.nextInt();
        int b = 0;        
        for (int j = 0; j < a.length; j ++) {
        	if (i == a[j]){
        		System.out.println("存在该数，该数下标为：" + j);
        		b = 1;
        		}
        	}
               if(b != 1){
                   System.out.println("not found");
                   }       
	}

}

　　

package homework4;

public class Code3 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		double[][] arr = {{2000,2001,2002,2003},{2004,2005,2006,2007},{2008,2009,2010,2011},{2012,2013,2014,2015},{2016,2017,2018,2019},{2020,2021,2022,2023}};
        for(int i = 0; i < arr.length; i ++) {
            System.out.println( );
        for(int j = 0; j < arr[i].length; j ++) {
            System.out.print(" ");
                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 homework4;

public class Code4 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		int[][] a= {{11, 22, 33, 44},{55, 66, 77, 88},{99, 111, 222, 333}};
        int max = a[0][0];
        for(int i = 0; i < 3; i ++){
            for(int j = 0; j < 4; j ++){
                if(max < a[i][j]){
                    max = a[i][j];
                }
            }
        }
        System.out.println("output max=" + max);
	}

}