C# Math.Cos()用法及代码示例

Math.Cos()是内置的Math类方法，该方法返回给定双值参数(指定角度)的余弦值。

用法:

public static double Cos(double num)

参数：

num:它是要返回余弦的角度(以弧度为单位)，并且此参数的类型为System.Double。

返回值：返回类型为System.Double的num的csoine。如果num等于NegativeInfinity，PositiveInfinity或NaN，则此方法返回NaN。

下面的程序来说明Math.Cos()方法。

示例1:演示Math.Cos()方法的用法。

// C# program to demonstrate working 
// Math.Cos() method 
using System; 
   
class Geeks { 
   
    // Main Method 
    public static void Main(String []args) 
    { 
        double a = 70; 
           
        // converting value to radians 
        double b = (a * (Math.PI)) / 180; 
   
        // using method and displaying result 
        Console.WriteLine(Math.Cos(b)); 
        a = 50; 
           
        // converting value to radians 
        b = (a * (Math.PI)) / 180; 
   
        // using method and displaying result 
        Console.WriteLine(Math.Cos(b)); 
        a = 73; 
           
        // converting value to radians 
        b = (a * (Math.PI)) / 180; 
  
        // using method and displaying result 
        Console.WriteLine(Math.Cos(b)); 
        a = 77; 
           
        // converting value to radians 
        b = (a * (Math.PI)) / 180; 
   
        // using method and displaying result 
        Console.WriteLine(Math.Cos(b)); 
    } 
}

输出：

0.342020143325669
0.642787609686539
0.292371704722737
0.224951054343865

示例2:当参数为NaN或无穷大时，显示Math.Cos()方法的用法。

// C# program to demonstrate working 
// Math.Cos() method in infinity case 
using System; 
  
class Geeks { 
      
    // Main Method 
    public static void Main(String []args) 
    { 
  
        double positiveInfinity = Double.PositiveInfinity;      
        double negativeInfinity = Double.NegativeInfinity; 
                 
                 
        double nan = Double.NaN; 
        double result; 
  
        // Here argument is negative infinity, 
        // output will be NaN 
         result = Math.Cos(negativeInfinity); 
         Console.WriteLine(result); 
  
        // Here argument is positive infinity, 
        // output will also be NaN 
        result = Math.Cos(positiveInfinity); 
        Console.WriteLine(result); 
  
        // Here argument is NaN, output will be NaN 
        result = Math.Cos(nan); 
        Console.WriteLine(result); 
    } 
}

输出：

NaN
NaN
NaN

相关用法

注：本文由纯净天空筛选整理自Kirti_Mangal大神的英文原创作品 C# | Math.Cos() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。