In C programming punctuation, KeyWords, Characters and etc are called Tokens.
Keywords are words that can not be used as a variable name, keywords meaning is already defined by the compiler.
Int, float are some example for keywords, we can not use these keywords as a variable name. Hope that you may ask what is Variable? here we have a tutorial for Variables.
There are 32 keywords in C Programming Language,Here is the list of 32 keywords
These KeyWords are also called as Reserved words,if you use these keywords as variable name, compiler will throw error.
In C Programming Language DataType refers to an extensive system used for declaring variables or functions of different types. The type of a variable determines how much space it occupies in storage and how the bit pattern stored is interpreted.
a is variable.
Here int is a Datatype, which tells the compiler that how much space needs for this integer variable.
|char||1 byte||-128 to 127 or 0 to 255|
|unsigned char||1 byte||0 to 255|
|signed char||1 byte||-128 to 127|
|int||2 bytes||-2,147,483,648 to 2,147,483,647|
|short||2 bytes||-32,768 to 32,767|
|float||4bytes||+/- 3.4e +/- 3|