Every programming language requires, programmers to declare the variables, to store values and manipulate them. 

Variables are nothing but reserved spaces in the memory. The variables can store different types of data like numbers, characters, decimals, or even words and sentences. 

The type of data that a variable will hold is determined by the data type with which it is declared.

For Example:

int a;

Here, a is a variable that will hold the integer values as it is declared with int keyword and int here is the data type.

There are two types of data types in C++:

  • Primitive Data Types
  • Non – Primitive Data Types

Primitive Data Types:

The built-in data types in C++, are known as the Primitive Data Types.

Following are the 7 basic data types in C++.

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

The memory occupied and the range of each of these data types s as follows:

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

Non – Primitive Data Types:

Non – Primitive Data Types are the ones that are also known as the user-defined data types as they can hold the data as per the choice of the programmer. We will read about these Non – Primitive Data Types in detail later on.

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