https://en.cppreference.com/w/cpp/language/types
Void Types
void
- type with empty set of values
- incomplete data type that cannot be completed.
- Objects this type are not allowed
- No arrays of void
- No variables to void
- You are allowed:
- Pointers to void
- Functions returning void
int Types
int
a number without fractional component
Polarity
signed
signed representation. first bit is polarity don’t actually write this. all integers are signed by default
signed int a = -20;unsigned
unsigned representation
unsigned int a = 20;Size
short
width of at least 16 bits
long
width of at least 32 bits
long long
width of atleast 64 bits
You can mix and match polarity and size eg. unsigned long myanus = 20;
Extended Integer Types
bool
true or false
char Types
char
character representation for values of 0-255
signed
signed character
unsigned
unsigned character
wchar_t
type for wide characters. same size, polarity and alignment as the integer. 32bits of unix, 16bits on windows
Floating-point types
float
single precision floating-type
double
double precision floating-type
long double
extended precision floating-type
Floating point types may support C++ Special Values
Strings
C++ Strings
strings must be imported with the #include <strings> command.
additionally, using namespace std;
a string is the non-primitive version of a char[]. instead of a fixed length, you can create a string and have it automatically manage the memory for you.
Null Pointer
std::nullptr