Introduction – Character Set
A character set is a set of characters which can be used to represent the information in C Language.
It is a set of all the alphabets, digits, and special symbols used in C Language which are:
| Alphabets | A to Z, a to z |
| Digits | 0 to 9 |
| Special Symbols | ,.;:!?@#$%+* |
So to learn any Language, one must has to know the character set of that language.
C Language Hand-Written Notes
Introduction – Token
When the compiler is processing the source code of a C Program, each group of characters separated by while space is called as a token.
A token is source program text that the compiler does not break down into separate elements.
A token is one or more symbols understood by the compiler that help it interpret your code. e.g. Keywords, Identifiers, Constants, Strings, Operators, etc.
C tokens are the basic buildings blocks in C Language which are constructed together to write a C Program.
| Tokens | Meaning |
| Keywords | Keywords are the reserved words meaning has been already defined to C compiler. |
| Constant | Constants are expression with fix value. |
| Identifier | The term identifier is usually used to identity various programming elements e.g. variable names |
| String | Sequences of Characters |
| Special Symbol | Symbols other than the Alphabets and Digits and white-spaces. |
| Operators | A symbol that represent a specific mathematical or non mathematical action. |