C Keywords – Reserved Words
In C, we have 32 keywords, which have their predefined meaning and cannot be used as a variable name. These words are also known as “reserved words”. It is good practice to avoid using these keywords as variable names. These are –
List of Keywords in C
| auto | double | int |
| struct | break | else |
| long | switch | case |
| enum | register | typedef |
| Char | extern | return |
| union | const | float |
| short | unsigned | continue |
| for | signed | void |
| default | goto | sizeof |
| volatile | do | if |
| static | while |
Basics usage of these keywords –
if, else, switch, case, default – Used for decision control programming structure.
break – Used with any loop OR switch case.
int, float, char, double, long – These are the data types and used during variable declaration.
for, while, do – types of loop structures in C.
void – One of the return type.
goto – Used for redirecting the flow of execution.
auto, signed, const, extern, register, unsigned – defines a variable.
return – This keyword is used for returning a value.
continue – It is generally used with for, while and dowhile loops, when compiler encounters this statement it performs the next iteration of the loop, skipping rest of the statements of current iteration.
enum – Set of constants.
sizeof – It is used to know the size.
struct, typedef – Both of these keywords used in structures (Grouping of data types in a single record).
union – It is a collection of variables, which shares the same memory location and memory storage.
volatile
