the variable is the name of the location which stores the value in c++. a variable is used to store value.
A variable is a data name that may be used to store data value.
A variable may take different values at different times during the execution of a program.
Variable names may consist of letters, digits, and underscore characters (_).
data_type variable1, variable2 ;
Also Read This:- operator in c++
Rules of variable :
The first character must be an alphabet or underscore.
Must consist of letters, digits, and underscore.
Cannot use a c++ keyword as a variable name. like int, float
Blank space is not allowed between variable name
Declaration of variable in c++ :
data_type v1, v2;
data_type: datatype is decide how data store in memory. like int, float
v1, v2 : v1 and v2 is name of variable
Example
int evensum, oddsum float radius
Assigning values of variable :
Values can be assigned to variables using the assignment operator = as follows:
variable_name = value sum = 10
Example
#include <iostream> using namespace std; int main() { int x = 5; int y = 6; int sum = x + y; cout << sum; return 0; }
output
11