Constants in C :

Constants in C :

A constant is an entity that doesn't change during the execution of a program.

Followings are the different types of constants :

1. REAL CONSTANT :

·         It must have at least one digit.

·         It must have a decimal point which may be positive or negative.

·         Use of blank space and comma is not allowed between real constants.

·         Example:

+194.143, -416.41

2. INTEGER CONSTANT :

·         It must have at least one digit.

·         It should not contain a decimal place.

·         It can be positive or negative.

·         Use of blank space and comma is not allowed between real constants.

·         Example:

1990, 194, -394

3. CHARACTER CONSTANT :

·         It is a single alphabet or a digit or a special symbol enclosed in a single quote.

·         Maximum length of a character constant is 1.

·         Example:

'T', '9', '$'

4. STRING CONSTANT :

·         It is collection of characters enclosed in double quotes.

·         It may contain letters, digits, special characters and blank space.

·         Example:

"Learn Programming"