Constants in C

Constants in C are fixed values that do not change during program execution. They can be of various types like integer, floating-point, or character.

Declaring Constants:

1. Using #define (Preprocessor Directive):
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   #define PI 3.14

2. Using const Keyword:
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   const int MAX = 100;


Types of Constants:

1. Integer Constants: 10, 0xA (Hexadecimal).
2. Floating-point Constants: 3.14, 2.718.
3. Character Constants: 'A', '@'.
4. String Constants: "Hello".

Example:

Constants ensure data integrity by preventing unintended modifications.