How to Convert a Char to an Int in C#

1. C# Program to Convert a Char to an Int Using GetNumericValue() Method
2. C# Program to Convert a Char to an Int Using Difference with 0 Method
3. C# Program to Convert a Char to an Int Using Int32.Parse() Method
4. C# Program to Convert a Char to an Int Using GetDecimalDigitValue() Method

In this article, we are going to discuss different methods to convert a character into an integer.

You can learn how to convert an int to char in this article.

C# Program to Convert a Char to an Int Using GetNumericValue() Method

GetNumericValue() is a built-in method to convert a character to an integer if the character is a numeric value. If the character is not a numeric value, it returns a negative value.

The correct syntax to use this method is as follows:

(int)Char.GetNumericValue(CharacterName);

This method returns a value of data type double. To convert it to an int, we could use typecasting.

Example Code:

using System;

namespace Example {
  class Conversion {
    static void Main(string[] args) {
      char Character = '9';
      Console.WriteLine("The character is: " + Character);
      int integer = (int)Char.GetNumericValue(Character);
      Console.WriteLine("The integer is: {0}", integer);
    }
  }
}

Output:

The character is: 9
The integer is: 9

C# Program to Convert a Char to an Int Using Difference with 0 Method

We all know that we have ASCII characters ranging from 0-127. In order to convert a numeric character to an integer, we will simply subtract a zero character ('0') from it. The resultant value will be an integer value. If the character is non-numeric, then subtracting a zero from it will result in a random integer value.

The correct syntax to use this method is as follows:

IntegerName = CharacterName - '0';

Example Code:

using System;

namespace Example {
  class Conversion {
    static void Main(string[] args) {
      char Character = '9';
      Console.WriteLine("The character is: " + Character);
      int integer = Character - '0';
      Console.WriteLine("The integer is: {0}", integer);
    }
  }
}

Output:

The character is: 9
The integer is: 9

C# Program to Convert a Char to an Int Using Int32.Parse() Method

The method Int32.Parse() converts a string into an integer. We can also use it to convert a character into an integer.

The correct syntax to use this method is as follows:

int.Parse(CharacterName.ToString());

Here we have passed Character.ToString() as a parameter to int.Parse() method. The method Character.ToString() converts the character to a string. This string is then converted into an integer.

Example Code:

using System;

namespace Example {
  class Conversion {
    static void Main(string[] args) {
      char Character = '9';
      Console.WriteLine("The character is: " + Character);
      int integer = int.Parse(Character.ToString());
      Console.WriteLine("The integer is: {0}", integer);
    }
  }
}

Output:

The character is: 9
The integer is: 9

C# Program to Convert a Char to an Int Using GetDecimalDigitValue() Method

GetDecimalDigitValue() method accepts a Unicode character as a parameter and returns the decimal digit value of the Unicode character. This method belongs to System.Globalization namespace.

The correct syntax to use this method is as follows:

CharUnicodeInfo.GetDecimalDigitValue(CharacterName);

Example Code:

using System;
using System.Globalization;

namespace Example {
  class Conversion {
    static void Main(string[] args) {
      char Character = '9';
      Console.WriteLine("The character is: " + Character);
      int integer = CharUnicodeInfo.GetDecimalDigitValue(Character);
      Console.WriteLine("The integer is: {0}", integer);
    }
  }
}

Output:

The character is: 9
The integer is: 9