Variable in C
Variable is an identifier which holds data of another one variable. It is an identifier whose value can be changed at the execution time of the program. It is used to identify into data in a program.
Rules to declare Variable
Every variable name should start with Alphabets, underscore.
No space is allowed in variables declaration.
The maximum length of a variable is 31 characters or allowed in variables
declaration.
No keyword should excess variable name.
In C program variables name always can be used to identify the input or
output data.
Except underscore, no other special signs are allowed in the middle of the
variable declaration.
Every variable name always should exit in the left-hand side of the assignment
operator.
Garbage value
If no input values are assigned by the user into the variable then the
system will give a default called garbage value.
Scope of variable
In C language a variable can be either global or local variable.
Global variable
A global variable is defined outside of all functions, generally on the top
of the program. The global variable will hold its value throughout the life of program.
Local variable
A local variable is declared within a function or a block. Local variables
only use within the function or block where it is declared.
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