MathF。C# 中的 Cos()方法，带示例
原文:https://www . geesforgeks . org/mathf-cos-method-in-c-sharp-with-examples/
MathF。Cos(Single) 是一个内置的 MathF 类方法，它返回给定浮点值参数(指定角度)的余弦值。
语法:公共静态 float Cos(float x)； 这里， x 是返回余弦的角度(以弧度为单位)，该参数的类型为系统。单。
返回值:该方法将返回系统类型的 x 的余弦。单。如果 x 等于 NegativeInfinity、PositiveInfinity 或 NaN ，则该方法返回 NaN 。
以下是说明上述方法使用的程序:
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));
}
}
Output:
0.7071068
0.5877852
0.34202
例 2: 展示 MathF 的工作原理。当参数为 NaN 或【无限】T3 时，Cos()方法。
// 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);
}
}
Output:
NaN
NaN
NaN
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