What Happens When a Float Expression Is Read Into an Int Variable

C++ Data Types

All variables utilise information-type during declaration to restrict the type of data to exist stored. Therefore, nosotros can say that information types are used to tell the variables the type of data it can store. Whenever a variable is defined in C++, the compiler allocates some memory for that variable based on the data-type with which information technology is declared. Every data type requires a different amount of memory.

Data types in C++ is mainly divided into three types:

1. Primitive Information Types: These information types are built-in or predefined data types and can be used directly by the user to declare variables. example: int, char , float, bool etc. Archaic data types available in C++ are:
   • Integer
   • Graphic symbol
   • Boolean
   • Floating Point
   • Double Floating Point
   • Valueless or Void
   • Wide Character
2. Derived Information Types: The data-types that are derived from the primitive or built-in datatypes are referred to as Derived Data Types. These can exist of four types namely:
   • Role
   • Array
   • Pointer
   • Reference
3. Abstract or User-Divers Data Types: These information types are defined past user itself. Like, defining a form in C++ or a structure. C++ provides the post-obit user-defined datatypes:
   • Course
   • Structure
   • Spousal relationship
   • Enumeration
   • Typedef divers DataType

This article discusses archaic data types available in C++.

• Integer: Keyword used for integer data types is int. Integers typically requires four bytes of retentivity space and ranges from -2147483648 to 2147483647.
  
• Character: Character information blazon is used for storing characters. Keyword used for character data type is char. Characters typically requires one byte of memory space and ranges from -128 to 127 or 0 to 255.
  
• Boolean: Boolean data type is used for storing boolean or logical values. A boolean variable can store either truthful or false. Keyword used for boolean data blazon is bool.
  
• Floating Indicate: Floating Point data type is used for storing single precision floating indicate values or decimal values. Keyword used for floating point data blazon is float. Bladder variables typically requires iv byte of retention space.
  
• Double Floating Indicate: Double Floating Bespeak data blazon is used for storing double precision floating indicate values or decimal values. Keyword used for double floating signal data type is double. Double variables typically requires 8 byte of memory infinite.
  
• void: Void means without any value. void datatype represents a valueless entity. Void data type is used for those function which does not returns a value.
  
• Wide Character: Wide character data type is also a character data type only this data blazon has size greater than the normal 8-bit datatype. Represented past wchar_t. It is by and large 2 or 4 bytes long.
  

Datatype Modifiers

As the name implies, datatype modifiers are used with the congenital-in information types to alter the length of information that a particular data blazon can concur.

Data type modifiers available in C++ are:

• Signed
• Unsigned
• Curt
• Long

Below table summarizes the modified size and range of born datatypes when combined with the blazon modifiers:

Data Type	Size (in bytes)	Range
curt int	2	-32,768 to 32,767
unsigned short int	2	0 to 65,535
unsigned int	iv	0 to 4,294,967,295
int	four	-ii,147,483,648 to 2,147,483,647
long int	4	-2,147,483,648 to 2,147,483,647
unsigned long int	four	0 to iv,294,967,295
long long int	viii	-(2^63) to (ii^63)-1
unsigned long long int	8	0 to 18,446,744,073,709,551,615
signed char	one	-128 to 127
unsigned char	i	0 to 255
float	four
double	eight
long double	12
wchar_t	ii or iv	one wide character

Annotation : Above values may vary from compiler to compiler. In the above example, we have considered GCC 32 bit.
We tin display the size of all the data types by using the sizeof() operator and passing the keyword of the datatype every bit argument to this part every bit shown below:

CPP

#include<iostream>

using namespace std;

int main()

{

cout << "Size of char : " << sizeof ( char )

<< " byte" << endl;

cout << "Size of int : " << sizeof ( int )

<< " bytes" << endl;

cout << "Size of short int : " << sizeof ( brusque int )

<< " bytes" << endl;

cout << "Size of long int : " << sizeof ( long int )

<< " bytes" << endl;

cout << "Size of signed long int : " << sizeof ( signed long int )

<< " bytes" << endl;

cout << "Size of unsigned long int : " << sizeof (unsigned long int )

<< " bytes" << endl;

cout << "Size of bladder : " << sizeof ( float )

<< " bytes" <<endl;

cout << "Size of double : " << sizeof ( double )

<< " bytes" << endl;

cout << "Size of wchar_t : " << sizeof ( wchar_t )

<< " bytes" <<endl;

return 0;

}

Output:

Size of char : 1 byte Size of int : 4 bytes Size of curt int : 2 bytes Size of long int : 8 bytes Size of signed long int : eight bytes Size of unsigned long int : eight bytes Size of float : 4 bytes Size of double : viii bytes Size of wchar_t : iv bytes

This article is contributed by Harsh Agarwal. If you similar GeeksforGeeks and would like to contribute, you can also write an commodity using write.geeksforgeeks.org or post your commodity to review-team@geeksforgeeks.org. See your article actualization on the GeeksforGeeks chief folio and help other Geeks.
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Source: https://www.geeksforgeeks.org/c-data-types/

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