C++ Data Types

What is Data Types?

All variables use data-type during declaration to restrict the type of data to be stored. Some memory occupied by compiler that variable based on the data-type with which it is declared. Every data type have different amount of memory..

C++ Data Types chart with size and range.

Variable Type	Variable Size in Byte	Range
int	4 bytes	-2147483648 to 2147483647
unsigned int	4 bytes	0 to 4294967295
signed int	4 bytes	-2147483648 to 2147483647
short int	2 bytes	-32768 to 32767
unsigned short int	2 bytes	0 to 65,535
signed short int	2 bytes	-32768 to 32767
long int	4 bytes	-2,147,483,648 to 2,147,483,647
signed long int	4 bytes	same as long int
unsigned long int	4 bytes	0 to 4,294,967,295
float	4 bytes	+/- 3.4e +/- 38 (~7 digits)
double	8 bytes	+/- 1.7e +/- 308 (~15 digits)
long double	8 bytes	+/- 1.7e +/- 308 (~15 digits)
wchar_t	2 or 4 bytes	1 wide character
char	1 byte	-127 to 127 or 0 to 255
unsigned char	1 byte	0 to 255
signed char	1 byte	-127 to 127

The size of variables might be different from those shown in the above table, depending on the PC and the PC you are using. Following is the example, which will produce correct size of various data types on your system. we can use sizeof(data type) for finding size in coding.

#include <iostream> // header

using namespace std; // including namespace std

int main()// main

 { 

   // output int size

   cout << "Size of int = " << sizeof(int) << endl; 

   // output char size

   cout << "Size of char = " << sizeof(char) << endl; 
   // output float size

   cout << "Size of float = " << sizeof(float) << endl; 
   // output double size

   cout << "Size of double = " << sizeof(double) << endl; 

   return 0;

}

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