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C# else if 语句


else if 语句

使用 else if 语句来指定一个新的条件,如果第一个条件是 False

语法

if (condition1)
{
  // block of code to be executed if condition1 is True
} 
else if (condition2) 
{
  // block of code to be executed if the condition1 is false and condition2 is True
} 
else
{
  // block of code to be executed if the condition1 is false and condition2 is False
}

示例

int time = 22;
if (time < 10) 
{
  Console.WriteLine("Good morning.");
} 
else if (time < 20) 
{
  Console.WriteLine("Good day.");
} 
else 
{
  Console.WriteLine("Good evening.");
}
// Outputs "Good evening."

自己尝试 »

示例说明

在上面的示例中,时间 (22) 大于 10,所以**第一个条件**是 False。下一个条件,在 else if 语句中,也是 False,所以我们继续执行 else 条件,因为**条件1** 和**条件2** 都是 False - 并在屏幕上打印 "晚上好"。

但是,如果时间是 14,我们的程序将打印 "您好"。


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