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C++ Keywords

C++ keywords are reserved words that have special meaning in the C++ programming language. They are part of the syntax and cannot be used as identifiers (such as variable names, function names, etc.). Understanding these keywords is essential for writing valid C++ code.

Categories of Keywords

List of C++ Keywords

Keyword Explanation
int Represents integer type.
float Represents floating-point type.
double Represents double-precision floating-point type.
char Represents character type.
bool Represents boolean type (true/false).
if Used for conditional statements.
else Used for alternative conditional statements.
switch Used for multi-way branching.
case Defines a branch in a switch statement.
default Defines the default branch in a switch statement.
for Used for for-loop iteration.
while Used for while-loop iteration.
do Used for do-while loop iteration.
break Exits from a loop or switch statement.
continue Skips the current iteration of a loop.
return Exits from a function and optionally returns a value.
auto Automatic storage duration (default storage class).
register Suggests that a variable be stored in a register for faster access.
static Extends the lifetime of a variable to the duration of the program.
extern Declares a variable defined elsewhere (in another file or scope).
void Indicates that a function does not return a value.
inline Suggests that the compiler replace a function call with the function code.
virtual Indicates that a function can be overridden in derived classes.
friend Allows a function or class to access private members of another class.
try Defines a block of code to be tested for exceptions.
catch Defines a block of code to handle exceptions.
throw Used to throw an exception.
class Defines a class.
struct Defines a structure.
namespace Defines a scope for identifiers to avoid name conflicts.
template Used to define a template for generic programming.
this Refers to the current object in a class.
new Allocates memory dynamically.
delete Deallocates memory that was previously allocated with new.
sizeof Returns the size of a data type or object.
typeid Used to get the type information of an expression.
volatile Indicates that a variable may be changed by external factors.
const Indicates that a variable's value cannot be changed after initialization.

Key Takeaways

  • C++ keywords are reserved words that form the syntax of the language.
  • Understanding keywords is crucial for writing correct and efficient C++ code.
  • Keywords are categorized based on their functionality, such as data types, control flow, and storage classes.
  • Familiarity with keywords enhances code readability and maintainability.
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