Java Week 3 summary

Third Course summary and test report writing Week (a)

Java test report

Class Jike a group of Student ID 20188375 Name Tangyun Yun

Complete time

Rating scale

Experiment a Java development environment with simple Java program

First, the purpose of the experiment

(1) be familiar with JDK development environment

(2) master structured programming method

Second, the experiment content

Printout of all "Number of daffodils", the so-called "number Narcissus" means a 3 -digit numbers which you cube and is equal to the number itself. For example, 153 is a "number daffodils."
Write Java programs, seek + 13-23 + 33-43 ... + 973-983 + 993-1003 value.
Programming seek 1 ! +2 ! +3 ! + ... + 20! .
Write Java programs, the calculation 8 + 88 + 888 + ... before 10 and Paragraph.
If it is exactly equal to a number of factors and, this number is called the complete number. Programming output 1000 all finished within a few.
Write applications, output meets . 1 + 2 +. 3 + ... + n-<8888 largest positive integer.
Use for loop to print the graphic below.

Third, the experimental process

1. printout of all the "number of Narcissus", the so-called "number Narcissus" means a 3 -digit numbers which you cube and is equal to the number itself. For example, 153 is a "number daffodils."

Experiments Source:

public class Flower
{
   public static void main(String[] args)
   {
        int  n, g, s, b;
        
        for(n=100;n<1000;n++)
        {
             g=n%10;
             s=n/10%10;
             b=n/100%10;
          
             if(n==g*g*g+s*s*s+b*b*b)
             {
                   System.out.println(n);
              }
         }
     }
}

The results:

2. write Java programs, seek + 13-23 + 33-43 ... + 973-983 + 993-1003 value.

Experiments Source:

public  class Sum
{
     public static void main(String[] args)
     {
           int n;
           int sum=0;
   
           for(n=1;n<=100;n++)
          {
               if(n%2==0)
               {
                      sum=sum-(n*10+3);
               }
               else
               {
                       sum=sum+n*10+3;
               }
           }
              System.out.println(sum);
       }
}

The results:

3. 编程求1！+2！+3！+…+20！。

实验源码：

public class Factorial 
{
         public static void main(String[] args)
        {
                   long sum=0;
                 for(int i=1;i<=20;i++)
                {
                          sum+=fact(i);
                }
                 System.out.println(sum);
         }
         public static long fact(int n)
        {
             long product=1;
            for(int i=1;i<=n;i++)
           {
                   product=product*i;
           }
               return product;
        }
}

实验结果：

4. 编写Java程序，计算8+88+888+…前10项之和。

实验源码：

public class Eight
{
          public static void main(String[] args)
          {
               int i;
               long item=8;
               long sum=0;
               
                for(i=1;i<11;i++)
                {
                      sum=sum+item;
                      item=item*10+8;
                 }
                 System.out.println(sum);
           }
}

实验结果：

5. 一个数如果恰好等于它的因子之和，这个数就称为完数。编写程序输出1000以内的所有完数。

实验源码：

 1 public class WanShu
 2 {
 3       public static void main(String[] args)
 4       {
 5              int i,j;
 6              for(i=1;i<=1000;i++)
 7              {
 8                      int sum=0;
 9                   for(j=1; j<i; j++)
10                   {
11                         if(i%j==0)
12                         {
13                              sum=sum+j;
14                         }
15                    }
16                    if(i==sum)
17                    {
18                           System.out.println( i );
19                     }
20                 }
21          }
22 }

实验结果：

6. 编写应用程序，输出满足1+2+3+…+n<8888的最大正整数。

实验源码：

public class Bign
{
      public static void main(String[] args)
      {
         int i;
         int sum=0;
 
         for(i=1; sum+i<8888; i++)
         {
                sum=sum+i;
         }
      
             System.out.println( i -1);
       }
}

实验结果：

7. 使用for循环打印下面的图形。

实验源码：

 1 public class Triangle
 2 {
 3     public static void main(String[] args)
 4    {    
 5            for (int i = 0; i < 5; i++) 
 6            {        
 7                    for (int j = i + 1; j < 5; j++) 
 8                    {            
 9                         System.out.print(" ");        
10                    }        
11                    for (int k = 0; k <= i; k++) 
12                    {            
13                          System.out.print("* ");        
14                    }        
15                          System.out.println();    
16             }
17     }
18 }

实验结果：

总结：

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