CPP Keywords, Identifires, Variables, Constants, Oprators etc.

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### Keywords in C++:
Keywords in C++ are reserved words that have a specific meaning and functionality within the language. These words cannot be used as identifiers (names for variables, functions, etc.) and play a crucial role in defining the syntax and structure of the language. Examples of C++ keywords include `int`, `class`, `if`, `else`, `while`, `return`, and more.

### Identifiers in C++:
Identifiers are names given to various program elements such as variables, functions, classes, etc. In C++, an identifier must begin with a letter or an underscore, followed by letters, digits, or underscores. Identifiers are case-sensitive, meaning `MyVariable` and `myvariable` are treated as different identifiers.

### Variables in C++:
Variables in C++ are containers for storing data values. A variable must be declared before it is used, specifying its data type and an optional initial value. Common data types for variables include `int` (integer), `double` (floating-point), `char` (character), and more. Example:
```cpp
int myNumber = 42;
```

### Constants in C++:
Constants are values that do not change during the execution of a program. In C++, you can define constants using the `const` keyword. Constants are helpful for making code more readable and maintaining values that should not be altered. Example:
```cpp
const double PI = 3.14159;
```

### Operators in C++:
Operators in C++ perform operations on variables and values. They can be classified into various categories, including arithmetic operators (`+`, `-`, `*`, `/`), relational operators (`==`, `!=`, `, ``), logical operators (`&&`, `||`, `!`), and more. Operators enable you to manipulate data and control the flow of your program.

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