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if…else

[Control Structures]

描述

if/else allows greater control over the flow of code than the basic if statement by allowing multiple tests to be grouped. For example, an analog input could be tested and one action taken if the input was less than 500, and another action taken if the input was 500 or greater.

範例程式碼

if (pinFiveInput < 500)
{
  // action A
}
else
{
  // action B
}

else can proceed another if test, so that multiple, mutually exclusive tests can be run at the same time.

Each test will proceed to the next one until a true test is encountered. When a true test is found, its associated block of code is run, and the program then skips to the line following the entire if/else construction. If no test proves to be true, the default else block is executed, if one is present, and sets the default behavior.

Note that an else if block may be used with or without a terminating else block and vice versa. An unlimited number of such else if branches is allowed.

if (pinFiveInput < 500) 
{ 
  // do Thing A 
} 
else if (pinFiveInput >= 1000)
{
  // do Thing B
}
else
{
  // do Thing C
}

Another way to express branching, mutually exclusive tests, is with the switch case statement.

參考


語法參考主頁面

86Duino 參考的文本是根據 Creative Commons Attribution-ShareAlike 3.0 License,部分文本是從 the Arduino reference 修改的。 參考中的代碼示例已發佈到公共領域。

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