Literals

literal values in source code. fixed values that are directly inserted into memory

std::cout << "Hello world!";
int x { 5 };

now, if you do something like print a variable with a fixed value, that is not calling a fixed value anymore

int x {5};
std::count << x; // not a fixed value, passing a variable

because a variable’s value is stored in memory, and it can change due to debugging or vulnerabilities.

Literal Suffixes

like when you want 50f to be a float. They are suffixes you put to assign quick data-types to the literals.

Data type	Suffix	Meaning
integral	u or U	unsigned int
integral	l or L	long
integral	ul, uL, Ul, UL, lu, lU, Lu, LU	unsigned long
integral	ll or LL	long long
integral	ull, uLL, Ull, ULL, llu, llU, LLu, LLU	unsigned long long
integral	z or Z	The signed version of std::size_t (C++23)
integral	uz, uZ, Uz, UZ, zu, zU, Zu, ZU	std::size_t (C++23)
floating point	f or F	float
floating point	l or L	long double
string	s	std::string
string	sv	std::string_view