Variables and constants

• Variable: -

An entity that may vary during program execution is called variable. Variable names are names given to memory location.
In any programs we do a lots of calculations. Using variables we can store, retrieve and manipulate data values.

Syntax: -

type var-name;

Where type is the the type of variable being declared;var-name is the variable name.

For example: -

char name;
int x;
float marks;

It is mandatory to declare the type of the variable.

Rules for constructing variables: -

• No commas or blanks are allowed within a variable name.

• No special symbol other than an underscore (such as in simp_inrst) can be used in a variable name.

Some of useful tips while declaring variables: -

• The variable names should be as short as possible. This makes it easier to remember variable names.

• It is advisable to declare meaningful variable-names. For example, if we want to maintain student database we can use variable names like name, roll_no, marks instead of using datatypes.

• Constant

A constant is an entity that doesn’t change.

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