Variable Types in C++ Assignment Help
Variable is an identifier that holds data or another variable whose value can be changed at the execution time of program. Variable is an identifier that is used to identify input data in a program.
Syntax
Variable name = value ;
The variable are stored as
int - stores integer number without decimals, such as 123 or -123
double - stores floating point numbers, with decimals, such as 19.99 or -19.99
char - stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotes
string - stores text, such as "Hello World". String values are surrounded by double quotes
bool - stores values with two states: true or false
Variable Definition in C++
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A variable is used to data, and it is a name of the memory location. Their value can be characterized and reused many number of times.
Syntax
type variable_list;
Example
int a, b, c;
char a, ab;
double b;
Variable Declaration in C++
A variable declaration has its meaning during the time of compilation and the compiler needs actual variable definition at the time of linking of the program. The process of allocating sufficient memory space for the data which is in term of variable.
Syntax
Datatype variable_name; int a;
If the input values are not assigned by the user then the system will gives a default value called garbage value.
Garbage value
Garbage value is any value given by system which is no way related to correct programs.
It is a disadvantage which can be overcome by initialization of a variable. Allocating the enough memory space with user defined values is the process of Variable Initialization.
Lvalues and Rvalues
C++ is a type of expression that belongs to a value category. The value categories are the basics for formulating the rules that compilers must follow when creating, copying, and moving temp objects during the evaluation of expression,.
A glvalue is an expression whose evaluation determines the identity of an object, bit-field, or function.
A prvalue is an expression whose evaluation initializes an object field or computes the value of an operator’s operand that is specified by the context.
An xvalue is a glvalue that denotes an object or bit-field whose resources can be reused (usually because it is near the end of its lifetime).
Example: Certain kinds of expressions involving rvalue references (5.8.3) yield xvalues, such as a call to a function whose return type is an rvalue reference or a cast to an rvalue reference type.
An lvalue is a glvalue that is not an xvalue. An rvalue is a prvalue or an xvalue.
Example
