Constants in C
A constant is a value or variable that can't be changed in the program, for example: 10, 20, 'a', 3.4, "c programming" etc.
There are different types of constants in C programming.
List of Constants in C
2 ways to define constant in C
There are two ways to define constant in C programming.
1) C const keyword
The const keyword is used to define constant in C programming.
Now, the value of PI variable can't be changed.
The value of PI is: 3.140000
If you try to change the the value of PI, it will render compile time error.
Compile Time Error: Cannot modify a const object
2) C #define preprocessor
The #define preprocessor is also used to define constant. We will learn about #define preprocessor directive later.
Visit here for: #define preprocessor directive.