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Here are the all keywords that used in C Language and their usage.
1. Auto
Auto keyword declares automatic variables.
2. Break
Brake statement makes program jump out of innermost enclosing loop explicitly.
3. Continue
Continue statement skips the certain statements inside the loop.
4. Switch, Case and DefaDefault
The switch and case is used when a block of statements has to be executed among different blocks.
5. Char
The char keyword declares a character variable.
6. Const
An identifier can be declared constant by using const keyword.
7. Do and While
Used to define a loop with at least one execution.
8. Double and Float
Keywords double and Float are used for declaring floating type variables.
9. If and Else
If and Else are used to make decisions.
10. Return
Return keyword terminates the function and return the value.
11. Sizeof
Sizeof keyword evaluates the size of data.
12. Register
Register keyword creates register values which are much faster then normal variables.
13. Goto
Goto keyword is used for unconditional jump to a labeled statement inside a function.
14. Int
Int keyword declares integer variables.
15. Short, long, signed and unsigned
These keywords are type modifiers that alters the meaning of a base data type to yield a new type.
16. Enum
Enumeration types are declared in C Programming using enum keyword.
17. Extern
Extern keyword declares that a variable or a function has external linkage outside of the file it is declared.
18. For
The for loop is used in C Programming using keyword For.
19. Union
A union is used for grouping different types of variables under a single name.
20. Void
Void keyword indicates that a function doesn’t return any value.
21. Volatile
Volatile keyword is used for creating volatile objects. A volatile object can be modified in an unspecified way by the hardware.
22. Static
Static keyword creates static variables. The value of the static variables persists until the young of the programme.
23. Struct
Struct keyword is used for declaring a structure. A structure can hold variables of different types under a single name.
24. Typedef
Typedef keyword is used to explicitly associate a type with an identifier.
