The Char.IsLetter() method in C# is used to indicate whether the specified Unicode character is categorized as a Unicode letter.SyntaxFollowing is the syntax −public static bool IsLetter (char ch);Above, the parameter ch is the Unicode character to evaluate.ExampleLet us now see an example to implement the Char.IsLetter() method −using System; public class Demo {    public static void Main(){       bool res;       char val = 'K';       Console.WriteLine("Value = "+val);       res = Char.IsLetter(val);       Console.WriteLine("Is the value a letter? = "+res);    } }OutputThis will produce the following ... Read More

The Char.IsHighSurrogate() method in C# indicates whether the Char object at the specified position in a string is a high surrogate.SyntaxFollowing is the syntax −public static bool IsHighSurrogate (string str, int index);Above, str is a string, whereas the index is the position of the character to evaluate in str.ExampleLet us now see an example to implement the Char.IsHighSurrogate() method −using System; public class Demo {    public static void Main(){       string str = new String(new char[] { 'k', 'm', 'g', 't', '\uD800' });       bool res = Char.IsHighSurrogate(str, 4);       if (res)   ... Read More

The Char.IsDigit() method in C# indicates whether the specified Unicode character is categorized as a decimal digit.SyntaxFollowing is the syntax −public static bool IsDigit (char ch);Above, the parameter ch is the Unicode character to evaluate.ExampleLet us now see an example to implement the Char.IsDigit() method −using System; public class Demo {    public static void Main(){       bool res;       char val = 'g';       Console.WriteLine("Value = "+val);       res = Char.IsDigit(val);       Console.WriteLine("Is the value a digit? = "+res);    } }OutputThis will produce the following output −Value = ... Read More

The MathF.Atan() method in C# is used to return the angle whose tangent is given as a float value argument.SyntaxFollowing is the syntax −public static float Atan (float val);Above, Val is the floating-point value.ExampleLet us now see an example to implement the MathF.Atan() method −using System; public class Demo {    public static void Main(){       float val1 = 1.2f;       float val2 = 45.5f;       Console.WriteLine("Angle (val1) = "+(MathF.Atan(val1)));       Console.WriteLine("Angle (val2) = "+(MathF.Atan(val2)));    } }OutputThis will produce the following output −Angle (val1) = 0.876058 Angle (val2) = 1.548822ExampleLet us ... Read More

The MathF.Asinh() method in C# is used to return the hyperbolic arc-sine of a floating-point value.SyntaxFollowing is the syntax −public static float Asinh (float val);ExampleLet us now see an example to implement the MathF.Asinh() method −using System; public class Demo {    public static void Main(){       float val1 = 1.2f;       float val2 = 45.5f;       Console.WriteLine("Angle (val1) = "+(MathF.Asinh(val1)));       Console.WriteLine("Angle (val2) = "+(MathF.Asinh(val2)));    } }OutputThis will produce the following output −Angle (val1) = 1.015973 Angle (val2) = 4.51098ExampleLet us now see another example to implement the MathF.Asinh() method ... Read More

The MathF.Asin() method in C# is used to return the angle whose sine is a float value argument.SyntaxFollowing is the syntax −public static float Asin (float val);Above, Val is the float value.ExampleLet us now see an example to implement the MathF.Asin() method −using System; public class Demo {    public static void Main(){       float val1 = 0.1f;       float val2 = 8.9f;       Console.WriteLine("Angle (val1) = "+(MathF.Asin(val1)));       Console.WriteLine("Angle (val2) = "+(MathF.Asin(val2)));    } }OutputThis will produce the following output −Angle (val1) = 0.1001674 Angle (val2) = NaNExampleLet us now see ... Read More

The MathF.Acosh() method in C# is used to return the hyperbolic arc-cosine of a floating-point value.SyntaxFollowing is the syntax −public static float Acosh (float val);Above, Val is the floating-point number.ExampleLet us now see an example to implement the MathF.Acosh() method −using System; public class Demo {    public static void Main(){       float val1 = 0.1f;       float val2 = 0.9f;       Console.WriteLine("Angle (val1) = "+(MathF.Acosh(val1)));       Console.WriteLine("Angle (val2) = "+(MathF.Acosh(val2)));    } }OutputThis will produce the following output −Angle (val1) = NaN Angle (val2) = NaNExampleLet us now see another example ... Read More

The MathF.Atan2() method in C# returns the angle whose tangent is the quotient of two floating-point numbers.SyntaxFollowing is the syntax −public static float Atan2 (float val1, float val2);Above, val1 is the x-coordinate of a point, whereas val2 is the y-coordinate.ExampleLet us now see an example to implement the MathF.Atan2() method −using System; public class Demo {    public static void Main(){       float val1 = 0.1f;       float val2 = 0.9f;       Console.WriteLine("Return value = "+(MathF.Atan2(val1, val2)));    } }OutputThis will produce the following output −Return value = 0.1106572ExampleLet us now see another example ... Read More

The Char.IsSurrogatePair() method in C# is used to indicate whether two adjacent Char objects at a specified position in a string form a surrogate pair.SyntaxFollowing is the syntax −public static bool IsSurrogatePair (string str, int index);Above, the string str is a string, whereas the index is the starting position of the pair of characters to evaluate within str.ExampleLet us now see an example to implement the Char.IsSurrogatePair() method −using System; public class Demo {    public static void Main(){       string str = new String(new char[] { 'k', 'm', 'g', 't', '\uD800' });       bool res ... Read More

The Char.IsSurrogate() method in C# indicates whether the specified character has a surrogate code unit.SyntaxFollowing is the syntax −public static bool IsSurrogate (string str, int index);Above, the parameter str is the string, whereas the index is the position of the character to evaluate in str.ExampleLet us now see an example to implement the Char.IsSurrogate() method −using System; public class Demo {    public static void Main(){       string str = new String(new char[] { 'k', 'm', 'g', 't', '\uD800' });       bool res = Char.IsSurrogate(str, 4);       if (res)          Console.WriteLine("Contains ... Read More