If we’ve got chars with numeric digits in them, we can convert them to numeric (double) values using the char.GetNumericValue method.

The following code:

double d = char.GetNumericValue('5');

Console.WriteLine(d);

Outputs the value: 5

So why does GetNumericValue return a double when a char can only be a single character and hold a single “number” (‘0’ to ‘9’)? Because char holds Unicode characters.

So the following code:

double d = char.GetNumericValue('⅔');

Console.WriteLine(d);

Outputs the value: 0.666666666666667

Hence the need for GetNumericValue to return a double.

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