Ways to define Constant in C

Prerequisite – Constants in C
In C programming language, there are several ways to define a constant, depending on the type of constant and where it is used in the program. Here are the most common ways to define a constant in C:

Using the “const” keyword –
The “const” keyword can be used to define constants in C. For example, to define an integer constant named “MAX” with the value 100, the following syntax can be used:
```
const int MAX = 100;
```
Using the “#define” preprocessor directive –
The “#define” preprocessor directive can also be used to define constants in C. For example, to define an integer constant named “MAX” with the value 100, the following syntax can be used:
```
#define MAX 100
```
Using the “enum” keyword –
The “enum” keyword can be used to define a set of named constants in C. For example, to define an enum named “Days” with the values “Monday”, “Tuesday”, “Wednesday”, etc., the following syntax can be used:
```
enum Days {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday};
```
Using “const” with pointers –
Constants can also be defined using pointers in C. For example, to define a constant string named “GREETING” with the value “Hello, world!”, the following syntax can be used:
```
const char* GREETING = "Hello, world!";
```

Note that using the “const” keyword is considered a safer and more modern way of defining constants in C, as it provides type checking and other benefits. The use of the “#define” preprocessor directive is less recommended, as it can lead to potential errors and is less safe.

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