查看大括号的源代码

Curly braces (also referred to as just "braces" or as "curly brackets") are a major part of the C programming language. They are used in several different constructs, outlined below, and this can sometimes be confusing for beginners.

An opening curly brace "{" must always be followed by a closing curly brace "}". This is a condition that is often referred to as the braces being balanced. The Arduino IDE (integrated development environment) includes a convenient feature to check the balance of curly braces. Just select a brace, or even click the insertion point immediately following a brace, and its logical companion will be highlighted.

At present this feature is slightly buggy as the IDE will often find (incorrectly) a brace in text that has been "commented out."

Beginning programmers, and programmers coming to C from the BASIC language often find using braces confusing or daunting. After all, the same curly braces replace the RETURN statement in a subroutine (function), the ENDIF statement in a conditional and the NEXT statement in a FOR loop.

Because the use of the curly brace is so varied, it is good programming practice to type the closing brace immediately after typing the opening brace when inserting a construct which requires curly braces. Then insert some carriage returns between your braces and begin inserting statements. Your braces, and your attitude, will never become unbalanced.

Unbalanced braces can often lead to cryptic, impenetrable compiler errors that can sometimes be hard to track down in a large program. Because of their varied usages, braces are also incredibly important to the syntax of a program and moving a brace one or two lines will often dramatically affect the meaning of a program.


<font color="sienna" size="+2">'''大括号的主要用途'''</font>


<font color="orange" size="+1">'''函数'''</font>

<pre style="color:dimgray">
 void myfunction(datatype argument){
    statements(s)
  }
</pre>


<font color="orange" size="+1">'''循环'''</font>

<pre style="color:dimgray">

  while (boolean expression)
  {
     statement(s)
  }

  do
  {
     statement(s)
  } while (boolean expression);

  for (initialisation; termination condition; incrementing expr)
  {
     statement(s)
  } 

</pre>


<font color="orange" size="+1">'''条件语句'''</font>

<pre style="color:dimgray">

  if (boolean expression)
  {
     statement(s)
  }

  else if (boolean expression)
  {
     statement(s)
  } 
  else
  {
     statement(s)
  }

</pre>


----


[[Arduino语法参考 | 返回Arduino语法参考列表]]

更多建议和问题欢迎反馈至 [http://www.yfrobot.com YFRobot论坛]