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.

package work6;

import java.util.*;

public class Work1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		// 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.
		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("冒泡排序结果为:");
		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 work6;
import java.util.*;
public class Work2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		/*
		 *  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"
		 */
		   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 work6;

import java.util.*;

public class Work3 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		// 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。
		Scanner input = new Scanner(System.in);
        int[][] a = new int[5][4];
        int temp= 0;
        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < 4; j++) {
                a[i][j] = temp;
                temp++;
            }
        }
        System.out.println("输入的数组为:");
        for (int i = 0; i < 5; i++) {
            for (int j = 0; j < 4; j++) {
                System.out.print(a[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 work6;

import java.util.*;

public class Work4 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		// 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.
        Scanner input = new Scanner(System.in);
        int[][] a = new int[5][4];
        int temp = 0;
        int max=0;
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 4; j++) {
                a[i][j] = temp;
                temp++;
            }
        }
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a[i].length-1; j++) {
                if(max<a[i][j]){
                    max=a[i][j];                    
                }
            }
        }
        System.out.println("最大值为:"+max);
	}

}