Variables in C Language

Categories: C language

A variable is a name of the memory location. It is used to store data. Its value can be changed, and it can be reused many times.

It is a way to represent memory location through symbol so that it can be easily identified.

Let's see the syntax to declare a variable:

type variable_list;  

The example of declaring the variable is given below:

int a;  

float b;  

char c;  

Here, a, b, c are variables. The int, float, char are the data types.

We can also provide values while declaring the variables as given below:

int a=10,b=20;//declaring 2 variable of integer type  

float f=20.8;  

char c='A';  

Rules for defining variables

A variable can have alphabets, digits, and underscore.

A variable name can start with the alphabet, and underscore only. It can't start with a digit.

No whitespace is allowed within the variable name.

A variable name must not be any reserved word or keyword, e.g. int, float, etc.


Valid variable names:

int a;  

int _ab;  

int a30;  

Invalid variable names:

int 2;  

int a b;  

int long;  

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