C# | Char.IsPunctuation() Method

In C#, Char.IsPunctuation() is a System.Char struct method which is used to check whether an Unicode character can be categorized as a punctuation mark or not. This method can be overloaded by passing different type and number of arguments to it.

1. Char.IsPunctuation(Char) Method
2. Char.IsPunctuation(String, Int32) Method

Char.IsPunctuation(Char) Method

This method is used to check whether the specified Unicode character matches with any punctuation mark or not. If it matches then it returns True otherwise return False.

Syntax:

public static bool IsPunctuation(char ch);

Parameter:

ch: It is the required Unicode character of System.char type which is to be compared.

Return Type: This method returns True, if it successfully matches any punctuation mark, otherwise returns False. The return type of this method is System.Boolean.

Example:

// C# program to illustrate the
// Char.IsPunctuation(Char) Method
using System;

class GFG {

    // Main Method
    static public void Main()
    {

        // Declaration of data type
        bool result;

        // checking if dot(.)
        // is a punctuation mark
        char ch1 = '.';
        result = Char.IsPunctuation(ch1);
        Console.WriteLine(result);

        // checking if semi-colon( ; )
        // is a punctuation mark
        char ch2 = ';';
        result = Char.IsPunctuation(ch2);
        Console.WriteLine(result);

        // checking if comma (, )
        // is a punctuation mark
        char ch3 = ', ';
        result = Char.IsPunctuation(ch3);
        Console.WriteLine(result);

        // checking if 'g' is
        // a punctuation mark
        char ch5 = 'g';
        result = Char.IsPunctuation(ch5);
        Console.WriteLine(result);
    }
}

Output:

True
True
True
False

Char.IsPunctuation(String, Int32) Method

This method is used to check whether the specified string at specified position matches with any punctuation mark or not. If it matches then it returns True otherwise returns False.

Syntax:

public static bool IsPunctuation(string str, int index);

Parameters:

str: It is the required string of System.String type which is to be compared.
index: It is the position of character in string which is to be compared and type of this parameter is System.Int32.

Return Type: The method returns True, if it successfully matches punctuation mark at the specified index in the specified string, otherwise returns False. The return type of this method is System.Boolean.

Exceptions:

• If the value of str is null then this method will give ArgumentNullException
• If the index is less than zero or greater than the last position in str then this method will give ArgumentOutOfRangeException.

Example:

// C# program to illustrate the
// Char.IsPunctuation(String, Int32) Method
using System;

class GFG {

    // Main Method
    static public void Main()
    {

        // Declaration of data type
        bool result;

        // checking for punctuation
        // in a string at specific location
        string str1 = "GeeksforGeeks";
        result = Char.IsPunctuation(str1, 2);
        Console.WriteLine(result);

        // checking for punctuation
        // in a string at specific location
        string str2 = "www.geeksforgeeks.org";
        result = Char.IsPunctuation(str2, 3);
        Console.WriteLine(result);
    }
}

Output:

False
True

Reference: https://docs.microsoft.com/en-us/dotnet/api/system.char.ispunctuation?view=netframework-4.7.2