What are variables in C++?

Variables in C++

In C++, a variable is a named memory location that stores a value of a specific data type. A variable can be thought of as a container that holds a value. The value stored in a variable can change during the execution of a program. Variables play an important role in C++ programming as they allow you to store, manipulate, and access data in your programs.

To use a variable in C++, you must first declare it by specifying its name and data type. For example:

int a;


The first statement declares a variable and the second statement assigns a value of 25 to it.

You can also make declarations and assignments in a single statement. It will look like

int a=25;

Rules for declaring a variable

The following are the rules for declaring a variable in C++:

Variable names must start with an alphabet

Variable names in C++ are case-sensitive, so “age” and “AGE” are considered to be two different variables.

Variable names cannot be reserved words or keywords, such as “int” or “for”.

Each variable must have a unique name within the same scope.

A variable must be declared with a specific data type, such as int, float, double, etc. This determines the size and range of values that can be stored in the variable.

A sample C++ program that illustrates the use of variables in C++

#include <iostream.h>

#include <math.h>

#include <conio.h>
void main()
int a=25;
float b=23.6;
double age=9.5;
cout<<"Value of integer variable"<<a<<endl;
cout<<"Value of float variable"<<b<<endl;
cout<<"Value of double variable"<<age<<endl;
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