C++ Data Types

double floating point

[Identify the data type] 1.7e308

Integer

[Identify the data type] 22

floating point

[Identify the data type] 3.4e38

character

[Identify the data type] M

Boolean

[Identify the data type] True

primitive data type

[data type] built-in or predefined and can be used directly by the user to declare variables

user defined data type

[data type] A data type that a user can define by making it a subclass of a standard type or creating a type that behaves as an object.

integer

[primitive data type] All whole numbers (both positive and negative) and zero.

character data type

[primitive data type] keyword: CHAR

double floating point data type

[primitive data type] keyword: DOUBLE requires 8 bytes of memory space

floating point data type

[primitive data type] keyword: FLOAT requires 4 bytes of memory space

integer

[primitive data type] keyword: INT

void data type

[primitive data type] represents a valueless entity

integer

[primitive data type] requires *4 bytes of memory space* and ranges from -2147483648 to 2147483648

character data type

[primitive data type] requires 1 byte of memory space and ranges -128 and 127 or 0 to 255

boolean data type

[primitive data type] used for storing boolean of logical values

character data type

[primitive data type] used for storing characters characters: any letter (a..zA..Z) numeral (0-9) any other symbol including SPACE

double floating point data type

[primitive data type] used for storing double precision floating point value or decimal values

floating point data type

[primitive data type] used for storing single precision floating point values or *decimal values*

void data type

[primitive data type] used for those function which does not return a value

void data type

[primitive data type] without any value

variable

[user-defined data type] also called IDENTIFIERS

variable

[user-defined data type] defined by the user and are given initial values

variable

[user-defined data type] provides us with named storage that our program can manipulate

variable

[user-defined data type] symbol used in a program that stands for a value or data stored in a computer memory

variable declaration

a typical variable declaration is of the form

cin

asks for an input from the user ex: cin >> yourname;

boolean variable

can store either *True or False* keyword: BOOL

how to declare a variable

datatype variablename; *[do not forget to put the semicolon]* ex: int marks; char sex; bool name1; float name2;

info

each variable in C++ has a specific type which determines the size and layout of the variables memory; the range of the value that can be stored with that memory; and the set of operations that can be applied to the variable

how to declare a variable

in C++ strings are not a built-in data type; whenever we want to use and manipulate strings we must add the necessary preprocessor directives #include <string> using namespace std;

data type

indicates the type of data that can be stored in a field

primitive data types

integer character boolean floating point double floating point valueless or void wide character

info

name of variable can be composed of letter/digit and underscore character. *It must begin with either a letter or an underscore,

cout

outputs what is within the statements ex, cout << "hello" << endl;

variable declaration

the form that introduces a new variable name and its data type in a program

variable declaration

type variable_name; type variable1_name; variable2_name; variable3_name;