C++ Keywords

In C++, keywords are reserved words that have predefined meanings and are used to identify specific elements or perform specific tasks in the programming language. These keywords cannot be used as identifiers (such as variable or function names) because they are already predefined and serve a particular purpose within the language. Here are the C++ keywords:

  1. Data Types:

    • int: Used to declare integer variables.
    • double: Used to declare double-precision floating-point variables.
    • char: Used to declare character variables.
    • bool: Used to declare boolean variables (true or false).

  2. Control Flow:

    • if: Used to specify a conditional statement.
    • else: Used in conjunction with the if statement to specify an alternative condition.
    • switch: Used to create a switch statement for multiple possible execution paths.
    • case: Used within a switch statement to define specific cases.
    • default: Used within a switch statement to define the default case.

  3. Loops:

    • for: Used to create a loop with a defined iteration.
    • while: Used to create a loop that executes as long as a specified condition is true.
    • do: Used to create a loop that executes at least once and then continues as long as a specified condition is true.
    • break: Used to exit a loop or switch statement.
    • continue: Used to skip the rest of the current iteration of a loop and continue with the next iteration.

  4. Functions:

    • void: Used to declare a function that does not return a value.
    • return: Used to exit a function and return a value (if applicable).

  5. Class and Objects:

    • class: Used to define a class.
    • struct: Used to define a structure.
    • public: Used to specify the accessibility of class members (public access).
    • private: Used to specify the accessibility of class members (private access).

  6. Memory Management:

    • new: Used to dynamically allocate memory for objects or arrays.
    • delete: Used to deallocate memory that was dynamically allocated using new.

  7. Others:

    • const: Used to declare a constant value that cannot be modified.
    • static: Used to specify that a variable or function belongs to the class rather than an instance of the class.
    • sizeof: Used to determine the size of a type or variable in bytes.

These are just a few examples of C++ keywords. It's important to note that these keywords are case-sensitive and cannot be used as identifiers in your code. Understanding and correctly using these keywords is crucial for writing valid and meaningful C++ programs.

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