"Too many characters in character literal error"

I'm struggling with a piece of code and getting the error:

Too many characters in character literal error

Using C# and switch statement to iterate through a string buffer and reading tokens, but getting the error in this line:

case '&&':

case '||':

case '==':

How can I keep the == and && as a char?

This is because, in C#, single quotes ('') denote (or encapsulate) a single character, whereas double quotes ("") are used for a string of characters. For example:

var myChar = '=';

var myString = "==";

Here's an example:

char myChar = '|';
string myString = "||";

Chars are delimited by single quotes, and strings by double quotes.

The good news is C# switch statements work with strings!

switch (mytoken)
{
    case "==":
        //Something here.
        break;
    default:
        //Handle when no token is found.
        break;
}

You cannot treat == or || as chars, since they are not chars, but a sequence of chars.

You could make your switch...case work on strings instead.