plc symbols

If multiple target files contain definitions with the same name as the global symbol, the duplicate definition error will occur when these target files are linked.For example, if we define a global integer variable in both the target file a and the target file B and initialize them, the linker willWhen you connect to B, an error is reported.This symbol can be defined as a strong symbol (strong symbol ). Some symbols can be defined as weak symbol ).For

The kernel introduces the mechanism for exporting symbols from a Linux kernel version 2.6. Only the EXPORT_SYMBOL or EXPORT_SYMBOL_GPL exported symbols in the kernel can be directly used in the kernel module. However, the kernel does not export all of the methods for obtaining the Linux kernel's unexported symbols. starting from a version of Linux kernel 2.6, the

1, first, the input method to switch to QQ Pinyin input method. After the switch is good, you can see it in the lower right corner of the desktop. As shown in the following figure. 2, the simplest output special symbol is directly according to the expression to play pinyin, such as playing La La LA, there will be special symbols, as shown in the following figure. 3, sometimes, want other special

When editing a document, you always encounter a large number of strange symbols to enter, but it is not easy to enter these symbols, usually by inserting symbols to enter, but not directly from the keyboard to enter these symbols, but fortunately Microsoft in WORD2010 also provides an automatic correction function. I c

Undefined Symbols for Architecture armv7Undefined Symbols for Architecture armv7sUndefined Symbols for Architecture arm64Undefined Symbols for Architecture i386Undefined Symbols for Architecture x86_64When multiple people work together on the same project or copy a project,

Recently in the writing PHP program found some special PHP symbols, such as continuous less than the symbol, three less than the symbol, eot,eod,echo example, print example, and suddenly found that with so long PHP, even PHP basic symbols are not recognized all, See the @ is also checked for a long while to know what meaning. Put the basic symbols and some of the

Learn about Dynamic Links (5)-Dynamic symbol tables and dynamic symbols The dynamic symbol table (. dynsym) is used to save the Import and Export symbols related to the dynamic link, excluding the symbols in the module. The. symtab saves all the symbols, including those in. dynsym. The

The special symbols commonly used in the shell are listed as follows: #;;; . ,/\ \ ' String ' |! $ ${} $? $$ $*\ "string\" * * *? : ^ $# [emailprotected] ' command ' {} [] [[]] () (()) | | {Xx,yy,zz,...} ~ ~+ ~- \\A dot represents a match to a character. The ' string ' single quote quotation marks the enclosed content, which is treated as a single string. The $ sign that represents the variable within the quotation marks, has no effect,That is, he is

The special symbols commonly used by http://www.cnblogs.com/balaamwe/archive/2012/03/15/2397998.html in the shell are listed below:# ; ;; . ,/\ ' String ' | ! $ ${} $? $$ $* "String" * * *? : ^ $# [email protected] ' command ' {} [] [[]] () (()) | | {Xx,yy,zz,...} ~ ~+ ~- \# pound (comments)This is almost a full-field symbol, in addition to the "first line" that has been mentioned earlier#!/bin/bashThe pound sign also often appears at the beginn

By assigning shortcuts to common symbols in word2010 documents, users can enter common symbols directly from the keyboard. The shortcut key here refers to the key combination of CTRL or ALT with one or more letters and symbols. The steps to assign a shortcut key to a common symbol in Word2010 are described below: In step 1th, open the Word2010 document window an

Statement: The following examples are all under Linux to try, window did not try. Those who are interested can try. Article needle C beginner.C language strong symbol and weak symbol is C beginners often easy to make mistakes in the place. And many times, especially with the development of many people with the program, it causes problems are often very strange and difficult to locate. What are strong and weak symbols?In the C language, functions and

The special symbols commonly used in the shell are listed below: #;;;.,/\ \ ' String ' |! $ ${} $? $$ $* \ string\ * **?: ^ $# $@ ' command ' {} [] [[]] () nbs p; (()) | | {xx,yy,zz,...} ~ ~+ ~- \\ # Well (comments) This is almost a full field symbol, except for the "first line \" that was previously mentioned; #!/ BIN/BASHNBSP The well numbers often appear at the beginning of a line, or after a complete instruction, which indicates

Symbols configuration item Array of symbols for storing series point markers. When all symbols are used, the new symbols starts from the starting bit, Default Value: symbols: [ 'circle', 'diamond', 'square', 'triangle', 'triangle-down

will slightly change: @ Echo off Set/a num = 4% % 2 The remainder of echo 4 divided by 2 is % num % Pause ③ Escape Symbol: If % itself is to be displayed, % must be used for escape before. For example: @ Echo off Echo a percent sign: % Echo Two percentage signs: % Echo Three percentage signs: % Pause 3 ,:,::① A single header: indicates that the row is a tag, and the content after it is a tag segment. For example, test indicates that the content under test is a tag segment, test is the name of t

To be able to use the keyboard to enter symbols that are not on the keyboard directly, users can do so by adding "autocorrect" entries to common symbols in Word2010. The steps for adding AutoCorrect entries to common symbols in Word2010 are as follows: In step 1th, open the Word2010 document window and switch to the Insert Ribbon. Click the symbol button in the

The special symbols commonly used in the shell are listed below:# ; ;; . ,/\ ' String ' | ! $ ${} $? $$ $* "String" * * *? : ^ $# [email protected] ' command ' {} [] [[]] () (()) | | {Xx,yy,zz,...} ~ ~+ ~- \# pound (comments)This is almost a full-field symbol, in addition to the "first line" that has been mentioned earlier#!/bin/bashThe pound sign also often appears at the beginning of a line, or after the complete instruction, which indicates t

" => "Test String" >> str.encoding => # Set string encoding: >> Str.encode ("Us-ascii") => "Test String" Symbol The symbol is an instance of Ruby's built-in class symbol. Their literal constructors are preceded by a colon: : A : Book : "Here's how to make a symbol with spaces in it." To create a symbol by using the To_sym method: >> "a". To_sym =>: A >> "coverting string to symbol with intern ...". Intern =>: "coverting string to symbol with intern ...

Detailed description of special symbols used in LinuxOriginal: https://www.cnblogs.com/lidabo/p/4323979.html# pound (comments)#管理员 $ normal UserIn the script#!/bin/bash #!/bin/shThe pound sign also often appears at the beginning of a line, or after the complete instruction, which indicates that the symbol is followed by the annotation text and will not be executed.# This is comments.echo "a = $a" # a = 0Because of this feature, when you temporarily do

This 2-day upgrade to Xcode6, using the iOS8 SDK to compile the old project, various Undefined symbols for architecture xxx, the spirit almost collapsed. But finally solved, this article briefly summed upSimply put,Undefined symbols is basically equivalent to Java classnotfoundexception, the most common reasons for this are:Build without the frameworkFor example, there's a piece of code I used OpenGL to int

Recently, some special PHP symbols were found when I was writing a PHP program, such as less than the symbol consecutively, three smaller than the symbol, eot, eod, echo, and print, suddenly I found that after using PHP for so long, I didn't even fully recognize the basic symbols of PHP. I saw the @ number and found out what it meant for a long time. sort the basic symb