在C#中, Single.IsNegativeInfinity(Single)是Single结构方法。此方法用于检查指定的浮点值是否为负无穷大。在某些浮点运算中,有可能获得负无穷大的结果。例如:如果任何负值除以零,则结果为负无穷大。
Syntax: public static bool IsNegativeInfinity (float f);
Parameter:
f: It is a single-precision floating-point number of type System.Single.
返回类型:如果指定值的计算结果为负无穷大,则此函数返回布尔值True ,否则返回False 。
示例:演示Single.IsNegativeInfinity(Single)方法:
// C# program to illustrate the
// Single.IsNegativeInfinity(Single)
// Method
using System;
class GFG {
// Main method
static public void Main()
{
// Dividing a negative number by zero
// results in Negative infinity.
// Dividing a number directly by 0
// produces an error
// So 0 is stored in a variable first
float zero = 0.0f;
float value = -5f;
float result = value / zero;
// Printing result
Console.WriteLine(result);
// Check result using IsNegativeInfinity() Method
Console.WriteLine(Single.IsNegativeInfinity(result));
// Result of floating point operation
// that is less than Single.MinValue
// is Negative Infinity
result = Single.MinValue * 7.9f;
// Printing result
Console.WriteLine(result);
// Check result using IsNegativeInfinity() Method
Console.WriteLine(Single.IsNegativeInfinity(result));
}
}
输出:
-Infinity
True
-Infinity
True
笔记:
- 任何小于Single.MinValue的浮点运算的结果都被视为负无穷大。
- 浮点运算返回PositiveInfinity或NegativeInfinity以指示溢出条件。
参考:
- https://docs.microsoft.com/zh-cn/dotnet/api/system.single.isnegativeinfinity?view=netstandard-2.1