Constants in C Language | C Language Tutorial

Constants in C Language

Constants are expressions with a fixed value. This is referred to as a fixed value that does not change during the execution of the program.

1     Integer Numerals: They are numerical constants that identify integer values

       Int x=5;

       Floating Point Numbers: They express numbers with decimals and/or exponents.

       floate y=20.5 ;

    Character and string literals-:  There also exist non-numerical constants, like:

'z'

'p'

"Hello world"

"How do you do?"

The first two expressions represent a single character constants and the following two represent string literals composed of several characters. Notice that to represent a single character we enclose it between single quotes (') and to express a string (which generally consists of more than one character) we enclose it between double quotes (").

Declared constants in C Language (const) :-

With the const prefix, you can declare constants with a specific type in the same way as you would do with a variable:

const int pathwidth = 100;

const char ch = 'a';

Here, pathwidth and tabulator are two typed constants. They are treated just like regular variables except that their values cannot be modified after their definition.

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