Convert char to int in C#

This post will discuss how to convert a char to int in C#.

1. Using `Char.GetNumericValue()` method

The recommended approach is to use the in-built GetNumericValue() method to convert a numeric Unicode character to its numeric equivalent.

The following example demonstrates the working of the GetNumericValue() method. It expects a char representation of a numeric value and returns a double value. A cast is needed to convert the double value to an int.

using System;

public class Example

{

public static void Main()

{

char ch = '9';

int intVal = (int)Char.GetNumericValue(ch);

Console.WriteLine(intVal);

}

Output: 9

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2. Difference with ‘0’

We know that each of the ASCII characters is represented by values from 0 through 127. To get the integer equivalent of characters ‘0’ to ‘9’, simply subtract ‘0’ from it. The following code example shows how to implement this:

using System;

public class Example

{

public static void Main()

{

char ch = '9';

int intVal = ch - '0';

Console.WriteLine(intVal);

}

Output: 9

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3. Using `CharUnicodeInfo.GetDecimalDigitValue()` method

Another approach is to use the CharUnicodeInfo.GetDecimalDigitValue() method, which returns the decimal digit value of the specified numeric Unicode character. This method is demonstrated below:

using System;

using System.Globalization;

public class Example

{

public static void Main()

{

char ch = '9';

int intVal = CharUnicodeInfo.GetDecimalDigitValue(ch);

Console.WriteLine(intVal);

}

Output: 9

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4. Using `Int32.Parse()` method

The following code example demonstrates how to use Int32.Parse() and Int32.TryParse() to convert char to its integer equivalent.

using System;

public class Example

{

public static void Main()

{

char ch = '9';

int intVal = int.Parse(ch.ToString());

Console.WriteLine(intVal);

}

Output: 9

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That’s all about converting char to int in C#.

1. Using Char.GetNumericValue() method

2. Difference with ‘0’

3. Using CharUnicodeInfo.GetDecimalDigitValue() method

4. Using Int32.Parse() method

1. Using `Char.GetNumericValue()` method

3. Using `CharUnicodeInfo.GetDecimalDigitValue()` method

4. Using `Int32.Parse()` method