C＃中的MathF.Cos()方法与示例

MathF.Cos(Single)是内置的MathF类方法，它返回给定浮点值参数(指定角度)的余弦值。

Syntax: public static float Cos (float x);
Here, x is the angle(measured in radian) whose cosine is to be returned and the type of this parameter is System.Single.

返回值：该方法将返回System.Single类型的x的余弦值。如果x等于NegativeInfinity，PositiveInfinity或NaN ，则此方法返回NaN 。

下面是说明上述方法的用法的程序：

范例1：

// C# program to illustrate the
// MathF.Cos(Single) Method
using System;
  
class GFG{
  
    // Main Method
    public static void Main(String[] args)
    {
        float a = 45f;
  
        // converting value to radians
        float b = (a * (MathF.PI)) / 180;
  
        // using method and displaying result
        Console.WriteLine(MathF.Cos(b));
  
        a = 54f;
  
        // converting value to radians
        b = (a * (MathF.PI)) / 180;
  
        // using method and displaying result
        Console.WriteLine(MathF.Cos(b));
        a = 70f;
  
        // converting value to radians
        b = (a * (MathF.PI)) / 180;
  
        // using method and displaying result
        Console.WriteLine(MathF.Cos(b));
    }
}

输出：

0.7071068
0.5877852
0.34202

示例2：显示当参数为NaN或Infinity时MathF.Cos()方法的工作方式。

// C# program to illustrate the
// MathF.Cos(Single) method 
using System;
  
class GFG {
  
    // Main Method
    public static void Main(String[] args)
    {
  
         // taking infinity values
        float positiveInfinity = float.PositiveInfinity;
        float negativeInfinity = float.NegativeInfinity;
  
        // taking NaN 
        float nan = float.NaN;
  
        float result;
  
        // Here argument is negative infinity,
        // so the output will be NaN
        result = MathF.Cos(negativeInfinity);
        Console.WriteLine(result);
  
        // Here argument is positive infinity,
        // so the output will also be NaN
        result = MathF.Cos(positiveInfinity);
        Console.WriteLine(result);
  
        // Here argument is NaN, output will be NaN
        result = MathF.Cos(nan);
        Console.WriteLine(result);
    }
}

输出：

NaN
NaN
NaN