C# 中的 Single.IsPositiveInfinity() 方法,附示例


C# 中的 Single.IsPositiveInfinity() 方法用于返回一个值,指示指定数字是否为正无穷大。

语法

语法如下 −

public static bool IsPositiveInfinity (float val);

在上面,参数 val 是一个单精度浮点数。

示例

下面让我们看一个示例 −

 实时演示

using System;
public class Demo {
   public static void Main() {
      float f1 = -25.0f/0.0f;
      float f2 = 5.0f/0.0f;
      Console.WriteLine("Value1 = "+f1);
      Console.WriteLine("Hashcode for Value1 = "+f1.GetHashCode());
      Console.WriteLine("TypeCode for Value1 = "+f1.GetTypeCode());
      Console.WriteLine("Is Value1 value is positive or negative infinity? = "+Single.IsInfinity(f1));
      Console.WriteLine("Is Value1 NaN? = "+Single.IsNaN(f1));
      Console.WriteLine("Is Value1 a positive infinity? = "+Single.IsPositiveInfinity(f1));
      Console.WriteLine("
Value2 = "+f2);       Console.WriteLine("Hashcode for Value2 = "+f2.GetHashCode());       Console.WriteLine("TypeCode for Value2 = "+f2.GetTypeCode());       Console.WriteLine("Is Value2 value is positive or negative infinity? = "+Single.IsInfinity(f2));       Console.WriteLine("Is Value2 NaN? = "+Single.IsNaN(f2));       Console.WriteLine("Is Value2 a positive infinity? = "+Single.IsPositiveInfinity(f2));    } }

输出

这将产生以下输出 −

Value1 = -∞
Hashcode for Value1 = -8388608
TypeCode for Value1 = Single
Is Value1 value is positive or negative infinity? = True
Is Value1 NaN? = False
Is Value1 a positive infinity? = False
Value2 = ∞
Hashcode for Value2 = 2139095040
TypeCode for Value2 = Single
Is Value2 value is positive or negative infinity? = True
Is Value2 NaN? = False
Is Value2 a positive infinity? = True

示例

下面让我们看另一个示例 −

 实时演示

using System;
public class Demo {
   public static void Main() {
      float f1 = 10.0f/0.0f;
      float f2 = -3.0f;
      Console.WriteLine("Value1 = "+f1);
      Console.WriteLine("Hashcode for Value1 = "+f1.GetHashCode());
      Console.WriteLine("TypeCode for Value1 = "+f1.GetTypeCode());
      Console.WriteLine("Is Value1 value is positive or negative infinity? = "+Single.IsInfinity(f1));
      Console.WriteLine("Is Value1 NaN? = "+Single.IsNaN(f1));
      Console.WriteLine("Is Value1 a positive infinity? = "+Single.IsPositiveInfinity(f1));
      Console.WriteLine("
Value2 = "+f2);       Console.WriteLine("Hashcode for Value2 = "+f2.GetHashCode());       Console.WriteLine("TypeCode for Value2 = "+f2.GetTypeCode());       Console.WriteLine("Is Value2 value is positive or negative infinity? = "+Single.IsInfinity(f2));       Console.WriteLine("Is Value2 NaN? = "+Single.IsNaN(f2));       Console.WriteLine("Is Value2 a positive infinity? = "+Single.IsPositiveInfinity(f2));    } }

输出

这将产生以下输出 −

Value1 = ∞
Hashcode for Value1 = 2139095040
TypeCode for Value1 = Single
Is Value1 value is positive or negative infinity? = True
Is Value1 NaN? = False
Is Value1 a positive infinity? = True
Value2 = -3
Hashcode for Value2 = -1069547520
TypeCode for Value2 = Single
Is Value2 value is positive or negative infinity? = False
Is Value2 NaN? = False
Is Value2 a positive infinity? = False

更新于:04-12-2019

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