What is variable ?

Variable is nothing just a name or place holder for a value. For example we have declared a int variable name invar. invar is nothing but a placeholder for a int value of 4 byte. The use of variable is to access this memory content or value using its name.We can get starting memory address of variable by writing & just before the variable name.

Declaring Variable :

data_type varname ;

Variable naming rules in C :

A.) First Character must be an alphabet (a-z or A-Z)

B.) Must consist of letters, digits or underscore.

C.) Cannot use reserved keywords

D.) Must not contain white spaces

 

Variable in c