If/else - 版本历史

2015年8月18日 (二) 13:22 Admin

2015-08-18T13:22:35Z

2015年7月18日 (六) 01:15 Admin

2015-07-18T01:15:16Z

Admin：以“ '''if/else''' allows greater control over the flow of code than the basic if statement, by allowing multiple tests to be grouped together. For example, an analog in...”为内容创建页面

2015-07-18T01:11:48Z

以“ '''if/else''' allows greater control over the flow of code than the basic if statement, by allowing multiple tests to be grouped together. For example, an analog in...”为内容创建页面

新页面

'''if/else''' allows greater control over the flow of code than the basic if statement, by allowing multiple tests to be grouped together. 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. The code would look like this:

<pre style="color:dimgray">
if (pinFiveInput < 500)
{
// action A
}
else
{
// action B
}
</pre>

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.

<pre style="color:dimgray">
if (pinFiveInput < 500)
{
// do Thing A
}
else if (pinFiveInput >= 1000)
{
// do Thing B
}
else
{
// do Thing C
}
</pre>

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

----

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@@ 第1行： / 第1行： @@
-'''if/else''' allows greater control over the flow of code than the basic if statement, by allowing multiple tests to be grouped together. 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. The code would look like this:
+'''if/else''' 通过允许多个测试组合在一起，相对基本if语句，允许更大的控制流。例如，可测试一个模拟量输入值，如果值小于500则执行一个动作，而如果输入值大于等于500则执行另一个动作。代码如下：
 <pre style="color:dimgray">
@@ 第14行： / 第14行： @@
-else can proceed another if test, so that multiple, mutually exclusive tests can be run at the same time.
+'''else''' 中可以进行另一个 if 测试，这样多个互斥的测试可以同时运行。
-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.
+<font color="red">'''注意:'''</font>一个else if 语句有没有else语句块都可以使用。允许无限制数量的 else if 分支。
-−
-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.
 <pre style="color:dimgray">
@@ 第36行： / 第35行： @@
 </pre>
-Another way to express branching, mutually exclusive tests, is with the [[switch case]] statement.
+另一种表达多分支互斥的判断语句是 [[switch case]] 语句。

←上一版本		2015年7月18日 (六) 01:15的版本
第36行：		第36行：
	</pre>		</pre>

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