C#中的Double.IsPositiveInfinity()方法用于返回一个值,该值指示指定的数字是否计算为正无穷大。
语法如下-
public static bool IsPositiveInfinity (double val);
上面的val是一个双精度浮点数。
现在让我们看一个例子-
using System; public class Demo { public static void Main() { double d = 1.0/0.0; Console.WriteLine("Double Value = "+d); Console.WriteLine("HashCode of Double Value = "+d.GetHashCode()); TypeCode type = d.GetTypeCode(); Console.WriteLine("TypeCode of Double Value = "+type); Console.WriteLine("Positive Infinity? = "+Double.IsInfinity(d)); Console.WriteLine("Check whether the specified value is NaN? = "+Double.IsNaN(d)); Console.WriteLine("Does the value evaluate to negative infinity? = "+Double.IsNegativeInfinity(d)); Console.WriteLine("Does the value evaluate to positive infinity? = "+Double.IsPositiveInfinity(d)); } }
输出结果
这将产生以下输出-
Double Value = ∞ HashCode of Double Value = 2146435072 TypeCode of Double Value = Double Positive Infinity? = True Check whether the specified value is NaN? = False Does the value evaluate to negative infinity? = False Does the value evaluate to positive infinity? = True
现在让我们来看另一个例子-
using System; public class Demo { public static void Main() { double d = -50.0/0.0; Console.WriteLine("Double Value = "+d); Console.WriteLine("HashCode of Double Value = "+d.GetHashCode()); TypeCode type = d.GetTypeCode(); Console.WriteLine("TypeCode of Double Value = "+type); Console.WriteLine("Positive Infinity? = "+Double.IsInfinity(d)); Console.WriteLine("Check whether the specified value is NaN? = "+Double.IsNaN(d)); Console.WriteLine("Does the value evaluate to negative infinity? = "+Double.IsNegativeInfinity(d)); Console.WriteLine("Does the value evaluate to positive infinity? = "+Double.IsPositiveInfinity(d)); } }
输出结果
这将产生以下输出-
Double Value = -∞ HashCode of Double Value = -1048576 TypeCode of Double Value = Double Positive Infinity? = True Check whether the specified value is NaN? = False Does the value evaluate to negative infinity? = True Does the value evaluate to positive infinity? = False