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What are tokens in C#?
Token is the smallest element of a program. Let us learn about identifiers and keywords in C# that are tokens −
Keywords
Keywords are reserved words predefined to the C# compiler. These keywords cannot be used as identifiers. However, if you want to use these keywords as identifiers, you may prefix the keyword with the @ character.
The following are some of the reserved keywords in C# −
| abstract | As | Base | bool | Break | byte | case |
| catch | char | checked | class | Const | continue | decimal |
| default | delegate | Do | double | Else | enum | event |
| explicit | extern | False | finally | Fixed | float | for |
| foreach | goto | If | implicit | In | in (generic modifier) | int |
| interface | internal | Is | lock | Long | namespace | new |
| null | object | operator | out | out (generic modifier) | override | params |
Identifiers
An identifier is a name used to identify a class, variable, function, or any other user-defined item. The basic rules for naming classes in C# are as follows −
A name must begin with a letter that could be followed by a sequence of letters, digits (0 - 9) or underscore. The first character in an identifier cannot be a digit.
It must not contain any embedded space or symbol such as? - + ! @ # % ^ & * ( ) [ ] { } . ; : " ' / and \. However, an underscore ( _ ) can be used.
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