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There is a fractional sequence of 2/1 + 3/2 + 5/3 + 8/5 + 13/8 +... Find the sum of the first 20 items of the series.Program: # Include Output result: 32.660261 Press any key to continue

C language: There is a score sequence: 2/1 + 3/2 + 5/3 + 8/5 + 13/8 +... Find the sum of the first 20 items in this seriesProgram: # Include Output result: 32.660261 Press any key to continue

. Modify environment variables: Go to the configuration file as shown in: Press "I" to enter the insert mode and add the scala environment compiling information, as shown in: From the configuration file, we can see that we have set "scala_home" and set the scala bin directory to path. Press the "ESC" key to return to normal mode, save and exit the configuration file: Run the following command to modify the configuration file: 4. display the installed Scala version on the terminal,

1th: the original ecology(1) Photo of the Sun, as follows:(2) Look at the code:Create a new page a.html, copy and paste the following content:3 ways to add CSS styles and their precedence Open with a browser and see what it looks like.(3) Knowledge interpretationEach browser has its own default settings, and the default value is used when the HTML tag is not cos

PHP learning series (1) -- string processing functions (3), php functions. PHP learning series (1) -- String Processing function (3), php function 11, crc32 () function to calculate the crc32 polynomial of a string. 32-bit cyclic

elements of array a are numeric arrays. isequal(A,B) Determine whether all elements of A and B are equal to 1. isreal(A) Determines whether all elements of array a are real numbers. If yes, it is 1. isempty(A) Determines whether a is an empty matrix. If it is null, it is 1. Otherwise, it is 0. isprime(A) Determines whether eac

Half-line code is used to generate the number of series (1, 2, 3... N), half-line Usage @{Sn: key name [= int]} Function: each key name generates 1, 2, 3 ...... [= Int] (optional) value of n series. It is used to initialize

parameter to complete the cooperation, the method of transmission is through the constructor, some through the attribute injection, the novice friends can compare their own two ways to apply the occasion.2. One of the refactoring is that the code is basically the same when chatting with both the message and the message received, so I refactor it. As for when to refactor, how to refactor, the novice friends can learn a lot of their own.These two points are usually in the project often encountere

LDAP-Series-1-Chapter-3-PHP-LDAPIfyouwanttousePHPwithldap.Youhavetoaddtheextensionlib. (ldap. so) GototheinstallfileofPHP. $ cdoptphp-5.4.5extldap $ us LDAP-Series-1-Chapter-3-PHP-LDAP If you want to use PHP with ldap. You have t

Take the series number @{sn:favorite}, put in the bag docIf the number of series@{doc:we_id}Is null, the maximum value of the primary key we_id field of the Favorite_base table is queried for initialization.@{sn:favorite=@{pk:favorite_id}}Number of seriesInsert the system number and the related content separatelyFavorite_base、Favorite_userIn the tableFull codeFile (blog_add_save.chtml) in the Site/blog dire

TCP/IP protocol details volume 1 Study Notes series 3-IP Routing Chapter 9 IP routing This chapter describes the basis of the TCP/IP protocol cluster. IP routing ensures that the correct transmission path can be found for the datagram. If it cannot be found, the sender will be notified of a failure to issue the message. The information used in the route finding p

use a placeholder. After the placeholder is inserted in the% symbol, it consists of a number and a "\$". See Example 3.Tip: Related functions: printf (), sprintf (), vfprintf (), vprintf (), and vsprintf ().Example Example 1fprintf($file,"%s world. Day number %u",$str,$number);? >Output:27The following text will be written to "test.txt":Hello World. Day Number 123Example 2fprintf($file,"%f",$number); ? >Output:123.000000Example 3Use placeholders:fpri

); // building display icons for labels with bitmap bitmapdescriptor bitmapdescriptor = bitmapdescriptorfactory. Frombitmap (bitmap); // Create a overlay //Set the coordinates of the callout position//Set the icon for the label icons//Set the title of the label title//Set the label to drag DRA Ggable true can be dragged and false can not drag long press function can listen to drag eventsoverlayoptions options =Newmarkeroptions (). Position (point). Icon (bitmapdescriptor). Title ( " Hao King b