Variables are used to store values that will change throughout the execution of the program.
int types are used to store integer eg: 3
double types are used to store floating value, it can also store integer too eg: 3.1415, 3.0
char types are used to store single character eg: 'a'
boolean types are used to store true/false value eg: true
An unique variable name is assigned to a variable type to serve as identifier
int a = 5;
int a = ;
double b = ;
char c = ' ' ;
boolean d = ;
cout<<" a = "<< a << endl ;
cout<<" b = "<< b << endl ;
cout<<" c = "<< c << endl ;
cout<<" d = "<< noboolalpha << d << endl ;
d = true