Java 实验课留的作业

 

《Java程序设计》实验报告

学号：04043351-25 姓名：王兆明     日期：2007年4月16日

题目：JAVA基本用法与数组的使用

实验环境：

      Jdk 6.0 for Windows

     

实验内容与完成情况：

import java.io.*;

import java.util.*;

 

//////////////////////////////////////////////////////////////////////////

//作业1:输出1000以内能被17和23整除的所有整数

 

class Hw_1

{

         public static void main(String[] args)

         {

                   for(int i=0;i<=1000;i++)

                   {

                            if(i%17==0&&i%23==0)

                                     System.out.println(i);

                   }

         }

}

//////////////////////////////////////////////////////////////////////////

/*作业2：输出

            A

          B C

          D E F

         H I J K

         L M N O

          P Q R

          R S

            T

*/

 

class Hw_2

{

         public static void main(String[] args)

         {

                   char a='A';

                   for(int i=1;i<=4;i++)

                   {

                            for(int k=4;k>=i;k--)

                            {

                                     System.out.print(" ");

                            }

                            for(int j=1;j<=i;j++)

                            {

                                    

                                     System.out.print(a+" ");

                                     a++;

                            }

                            System.out.print('/n');

                   }

                   for(int i=4;i>=1;i--)

                   {

                            for(int k=4;k>=i;k--)

                            {

                                     System.out.print(" ");

                            }

                            for(int j=1;j<=i;j++)

                            {

                                     System.out.print(a+" ");

                                     a++;

                            }

                            System.out.print('/n');

                   }

                  

         }

}

//////////////////////////////////////////////////////////////////////////

//作业3：3个整数中选取最大值和最小值

//import java.io.*;

//import java.util.*;

class Hw_3

{

         public static void main(String[] args)

         {

                   int[] a=new int[3];

                   String s;

                   BufferedReader in=new BufferedReader(new InputStreamReader(System.in));

                   System.out.println("please input three number");

                   for(int i=0;i<=2;i++)

                   {

                            try{

                                     a[i]=new Integer(in.readLine()).intValue();

                            }

                            catch(Exception e)

                            {

                                     a[i]=0;

                            }

                   }

                   Arrays.sort(a);

                   System.out.println("Max:"+a[2]);

                   System.out.println("Min:"+a[0]);

         }

}

 

//////////////////////////////////////////////////////////////////////////

//作业4:水仙花数是三位数，各个数字的立方和等于数字本省

 

class Hw_4

{

         public static void main(String[] args)

         {

                   for(int i=100;i<=999;i++)

                   {

                            if(Math.pow(i%10,3)+Math.pow((i/10)%10,3)+Math.pow((i/100)%10,3)==i)

                            System.out.println("The number is "+i);

                   }

         }

}

 

 

//20长度的数组，一次赋值1~20,计算数组下标为奇数的元素之和

class Hw_2_1

{

         public static void main(String[] args)

         {

                   int[] a=new int[20];

                   for(int i=1;i<=20;i++)

                   {

                            a[i-1]=i;

                   }

                   int sum=0;

                   for(int i=1;i<=20;i++)

                   {

                            if(i%2!=0)

                            {

                                     sum=sum+a[i];

                            }

                   }

                   System.out.println(sum);

         }

}

 

//比较两个数组arr1={2,4,6,8,10}和arr2={3,5,7,9,11,13,15,17}长度，然后用长度短的覆盖长度长的前几项，输出到屏幕上。

 

class Hw_2_2

{

         public static void main(String[] args)

         {

                   int[] arr1={2,4,6,8,10};

                   int[] arr2={3,5,7,9,11,13,15,17};

                  

                   if(arr1.length>=arr2.length)

                   {

                            for(int i=0;i<=arr2.length-1;i++)

                            {

                                     arr1[i]=arr2[i];

                            }

                            for(int i=0;i<=arr1.length-1;i++)

                                     System.out.println(arr1[i]);

                   }else

                   {

                            for(int i=0;i<=arr1.length-1;i++)

                            {

                                     arr2[i]=arr1[i];

                            }

                            for(int i=0;i<=arr2.length-1;i++)

                                     System.out.println(arr2[i]);

                   }

                  

         }

}

 

 

//计算二维数组各个元素的和，arr数组有3行4列。

class Hw_2_3

{

         public static void main(String[] args)

         {

                   int[][] arr={{1,2,3,4},{11,22,33,44},{111,222,333,444}};

                   int sum=0;

                   for(int i=0;i<=2;i++)

                   {

                            for(int j=0;j<=3;j++)

                            {

                                     sum=sum+arr[i][j];

                            }

                   }

                   System.out.println(sum);

         }

}