Constant in C

Constants are those data item whose value will not change at the time of program execution.

Basically there are four type of constant such as:

1. Character Constant
Character constants are alphabets.The length of character may be one or than one. Write all Characters are inside the single quote. example: 'a', 'az'
2. String Constant
String constants are group of one or more characters. Write all string constant inside double quote (" "). Example:("a"), ("Shailu").
3. Integer Constant
Integer constant represent the integer numbers , which combination of numbers between 0 to 9.
4. Floating Point Constant
Floating point constant represent the floating numbers such as decimal numbers (2.33 , 44.56).

Special constant

Special constants are Symbolic constant. It is represented by any symbol or a name. It must define before use it , so for defining Define keyword is used. Example: #define AB6.33D