Primitive C++ Built-in Types

datatypes.md

C++ Data Types

C++ offer the programmer a rich assortment of built-in as well as user defined data types. Following table lists down seven basic C++ data types.

Type	Keyword
Boolean	bool
Character	char
Integer	int
Floating point	float
Double floating point	double
Wide character	wchar_t

Several of the basic types can be modified using one or more of these type modifier:

• signed
• unsigned
• short
• long

The following table shows the variable type, how much memory it takes to store the value in memory, and what is maximum and minimum vaue which can be stored in such type of variables.

Type	Typical Bit Width	Typical Range
unsigned char	1byte	0 to 255
(signed) char	1byte	-127 to 127
unsigned int	4bytes	0 to 4294967295
(signed) int	4bytes	-2147483648 to 2147483647
unsigned short int	2bytes	0 to 65535
(signed) short int	2bytes	-32768 to 32767
unsigned long int	8bytes	0 to 4294967295
(signed) long int	8bytes	-2147483647 to 2147483647
float	4bytes	1.18e-38 to 3.40e38 (7 dígitos)
double	8bytes	2.23e-308 to 1.79e308 (15 dígitos)
long double	16bytes	3.37e-4932 to 1.18e4932 (18 dígitos)
wchar_t	4 bytes	1 wide character

The sizes of variables might be different from those shown in the above table, depending on the compiler and the computer you are using.

#include <iostream>
using namespace std;

int main()
{
   cout << "Size of char : " << sizeof(char) << endl;
   cout << "Size of int : " << sizeof(int) << endl;
   cout << "Size of short int : " << sizeof(short int) << endl;
   cout << "Size of long int : " << sizeof(long int) << endl;
   cout << "Size of float : " << sizeof(float) << endl;
   cout << "Size of double : " << sizeof(double) << endl;
   cout << "Size of wchar_t : " << sizeof(wchar_t) << endl;
   return 0;
}