Single.IsNaN(Single) Single.IsNaN(Single) Single.IsNaN(Single) Single.IsNaN(Single) Method

定义

返回一个值,该值指示指定的值是否不为数字 (NaN)。Returns a value that indicates whether the specified value is not a number (NaN).

public:
 static bool IsNaN(float f);
public static bool IsNaN (float f);
static member IsNaN : single -> bool
Public Shared Function IsNaN (f As Single) As Boolean

参数

f
Single Single Single Single

单精度浮点数。A single-precision floating-point number.

返回

如果 f 计算为非数字 (NaN),则为 true;否则为 falsetrue if f evaluates to not a number (NaN); otherwise, false.

示例

下面的代码示例演示了IsNaN方法。The following code example demonstrates the IsNaN method.

// This will return true.
if ( Single::IsNaN( 0 / zero ) )
{
   Console::WriteLine( "Single::IsNan() can determine whether a value is not-a-number." );
}
// This will return true.
if (Single.IsNaN(0 / zero))
{
    Console.WriteLine("Single.IsNan() can determine whether a value is not-a-number.");
}
' This will return true.
If Single.IsNaN(0 / zero) Then
    Console.WriteLine("Single.IsNan() can determine whether a value is not-a-number.")
End If

注解

浮点运算返回NaN发出信号的操作的结果是不确定。Floating-point operations return NaN to signal that result of the operation is undefined. 例如,将除以 0.0 0.0 导致NaNFor example, dividing 0.0 by 0.0 results in NaN.

备注

IsNaN 返回false如果Single值为PositiveInfinityNegativeInfinityIsNaN returns false if a Single value is either PositiveInfinity or NegativeInfinity. 若要测试这些值,请使用IsInfinityIsPositiveInfinity,和IsNegativeInfinity方法。To test for these values, use the IsInfinity, IsPositiveInfinity, and IsNegativeInfinity methods.

适用于

另请参阅