Single.NaN フィールド
定義
重要
一部の情報は、リリース前に大きく変更される可能性があるプレリリースされた製品に関するものです。 Microsoft は、ここに記載されている情報について、明示または黙示を問わず、一切保証しません。
非数 (NaN) を表します。 このフィールドは定数です。
public: float NaN = NaN;public const float NaN = NaN;val mutable NaN : singlePublic Const NaN As Single = NaNフィールド値
Value = NaN例
定数の例を次に示し NaN ます。
Single zero = 0;
// This condition will return false.
if ( (0 / zero) == Single::NaN )
{
Console::WriteLine( "0 / 0 can be tested with Single::NaN." );
}
else
{
Console::WriteLine( "0 / 0 cannot be tested with Single::NaN; use Single::IsNan() instead." );
}
Single zero = 0;
// This condition will return false.
if ((0 / zero) == Single.NaN)
{
Console.WriteLine("0 / 0 can be tested with Single.NaN.");
}
else
{
Console.WriteLine("0 / 0 cannot be tested with Single.NaN; use Single.IsNan() instead.");
}
Dim zero As Single = 0
' This condition will return false.
If (0 / zero) = Single.NaN Then
Console.WriteLine("0 / 0 can be tested with Single.NaN.")
Else
Console.WriteLine("0 / 0 cannot be tested with Single.NaN; use Single.IsNan() instead.")
End If
注釈
演算の結果が未定義の場合、メソッドまたは演算子はを返し NaN ます。 たとえば、0を0で除算した結果は NaN 、次の例に示すように、になります。 (ただし、0以外の数値を0で除算すると PositiveInfinity NegativeInfinity 、除数の符号に応じてまたはのいずれかが返されます)。
float zero = 0.0f;
Console.WriteLine("{0} / {1} = {2}", zero, zero, zero/zero);
// The example displays the following output:
// 0 / 0 = NaN
Dim zero As Single = 0
Console.WriteLine("{0} / {1} = {2}", zero, zero, zero/zero)
' The example displays the following output:
' 0 / 0 = NaN
また、次の例に示すように、値を持つメソッド呼び出し NaN または値に対する操作が NaN 返さ NaN れます。
float nan1 = Single.NaN;
Console.WriteLine("{0} + {1} = {2}", 3, nan1, 3 + nan1);
Console.WriteLine("Abs({0}) = {1}", nan1, Math.Abs(nan1));
// The example displays the following output:
// 3 + NaN = NaN
// Abs(NaN) = NaN
Dim nan1 As Single = Single.NaN
Console.WriteLine("{0} + {1} = {2}", 3, nan1, 3 + nan1)
Console.WriteLine("Abs({0}) = {1}", nan1, Math.Abs(nan1))
' The example displays the following output:
' 3 + NaN = NaN
' Abs(NaN) = NaN
IsNaN値が数値でないかどうかを判断するには、メソッドを使用します。 一般に、 Single 演算子を使用して他の値と比較することはできません Single.NaN が、 Single 比較メソッド ( Equals やなど CompareTo ) は使用できます。 次の例は、比較演算子とメソッド間の動作の違いを示してい Single ます。
using System;
public class Example
{
public static void Main()
{
Console.WriteLine("NaN == NaN: {0}", Single.NaN == Single.NaN);
Console.WriteLine("NaN != NaN: {0}", Single.NaN != Single.NaN);
Console.WriteLine("NaN.Equals(NaN): {0}", Single.NaN.Equals(Single.NaN));
Console.WriteLine("! NaN.Equals(NaN): {0}", ! Single.NaN.Equals(Single.NaN));
Console.WriteLine("IsNaN: {0}", Double.IsNaN(Double.NaN));
Console.WriteLine("\nNaN > NaN: {0}", Single.NaN > Single.NaN);
Console.WriteLine("NaN >= NaN: {0}", Single.NaN >= Single.NaN);
Console.WriteLine("NaN < NaN: {0}", Single.NaN < Single.NaN);
Console.WriteLine("NaN < 100.0: {0}", Single.NaN < 100.0f);
Console.WriteLine("NaN <= 100.0: {0}", Single.NaN <= 100.0f);
Console.WriteLine("NaN >= 100.0: {0}", Single.NaN > 100.0f);
Console.WriteLine("NaN.CompareTo(NaN): {0}", Single.NaN.CompareTo(Single.NaN));
Console.WriteLine("NaN.CompareTo(100.0): {0}", Single.NaN.CompareTo(100.0f));
Console.WriteLine("(100.0).CompareTo(Single.NaN): {0}", (100.0f).CompareTo(Single.NaN));
}
}
// The example displays the following output:
// NaN == NaN: False
// NaN != NaN: True
// NaN.Equals(NaN): True
// ! NaN.Equals(NaN): False
// IsNaN: True
//
// NaN > NaN: False
// NaN >= NaN: False
// NaN < NaN: False
// NaN < 100.0: False
// NaN <= 100.0: False
// NaN >= 100.0: False
// NaN.CompareTo(NaN): 0
// NaN.CompareTo(100.0): -1
// (100.0).CompareTo(Single.NaN): 1
Module Example
Public Sub Main()
Console.WriteLine("NaN = NaN: {0}", Single.NaN = Single.NaN)
Console.WriteLine("NaN <> NaN: {0}", Single.NaN <> Single.NaN)
Console.WriteLine("NaN.Equals(NaN): {0}", Single.NaN.Equals(Single.NaN))
Console.WriteLine("Not NaN.Equals(NaN): {0}", Not Single.NaN.Equals(Single.NaN))
Console.WriteLine("IsNaN: {0}", Double.IsNaN(Double.NaN))
Console.WriteLine()
Console.WriteLine("NaN > NaN: {0}", Single.NaN > 100.0f)
Console.WriteLine("NaN >= NaN: {0}", Single.NaN >= 100.0f)
Console.WriteLine("NaN < NaN: {0}", Single.NaN < Single.NaN)
Console.WriteLine("NaN < 100.0: {0}", Single.NaN < 100.0f)
Console.WriteLine("NaN <= 100.0: {0}", Single.NaN <= 100.0f)
Console.WriteLine("NaN >= 100.0: {0}", Single.NaN > 100.0f)
Console.WriteLine("NaN.CompareTo(NaN): {0}", Single.NaN.CompareTo(Single.Nan))
Console.WriteLine("NaN.CompareTo(100.0): {0}", Single.NaN.CompareTo(100.0f))
Console.WriteLine("(100.0).CompareTo(Single.NaN): {0}", (100.0f).CompareTo(Single.NaN))
End Sub
End Module
' The example displays the following output:
' NaN == NaN: False
' NaN != NaN: True
' NaN.Equals(NaN): True
' ! NaN.Equals(NaN): False
' IsNaN: True
'
' NaN > NaN: False
' NaN >= NaN: False
' NaN < NaN: False
' NaN < 100.0: False
' NaN <= 100.0: False
' NaN >= 100.0: False
' NaN.CompareTo(NaN): 0
' NaN.CompareTo(100.0): -1
' (100.0).CompareTo(Single.NaN): 1