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int - Integer data type (whole numbers)

float - Floating-point data type (single precision)

double - Floating-point data type (double precision)

char - Character data type (holds a single character)

void - Represents "nothing" or "no return type" for functions

Bool - Boolean type (C99 and later) for true / false values

_Complex - Complex number data type (C99)

_Imaginary - Imaginary data type (C99)

If - Conditional statement (if true, execute code)

else - Executes code if the if condition is false

switch - Selects one code block from many possible options

case - Defines a possible path in a switch statement

default - Default path in a switch statement if no case matches

for - Loop with a control variable (count-controlled loop)

while - Loop with a condition (condition-controlled loop)

do - Executes the loop at least once, then checks the condition

goto - Transfers control to a labeled statement (not recommended)

break - Terminates the loop or switch statement prematurely

continue - Skips the current iteration of a loop and moves to the next iteration

return - Exits from a function and optionally returns a value to the caller

_Atomic - Declares atomic objects (thread-safe objects)

_Thread_local - Declares thread-local storage (C11)

_Static_assert - Compile-time assertion (C11)

auto - Default storage class for local variables (rarely used)

static - Variable retains its value across function calls (used for global/local scope)

extern - Declares a global variable or function defined in another file

register - Suggests to store the variable in a CPU register for faster access (optional)

const - Declares a read-only constant variable that cannot be changed after initialization

volatile - Tells the compiler that the value of a variable can change at any time (useful for memory- mapped registers)

restrict - Used in pointers to indicate that no other pointer will modify the object (C99)

const - Declares a variable as read-only (cannot be modified)

volatile - Informs the compiler not to optimize code involving this variable because its value can change unexpectedly

restrict - Declares that the pointer is the only reference to that memory address (C99)

typedef - Defines a new name (alias) for an existing type

struct - Defines a structure, a collection of variables of different types

union - Defines a data structure where all members share the same memory space

enum - Defines an enumeration, a set of named integer constants

sizeof - Returns the size in bytes of a variable, data type, or structure

alignof - Returns the alignment requirement of a type (introduced in C11)

_Alignas - Specifies the alignment of a variable (C11)

inline - Suggests that a function should be inlined (its code is inserted directly into the calling location)

_Noreturn - Tells the compiler that a function does not return a value (C11)