Is your feature request related to a problem? Please describe.
The ploblem is the only can do a operation with 2 numbers

a + a

Describe the solution you'd like
Possiblity to do

a + a + a =

or

b + b - b x b =

Describe alternatives you've considered
uh

Additional context
Will be so hard but with classes and funcionts or defs can be possiblity

And need a better inglish for me

i know that you dont understane me.......

Example

file: cpp advance

cout << "Ponga su primero numero: " << endl;

        cin >> a;
        
        //now the user put the operator.including the second input number
        

if i input a other thing that is not a number cause a something that i dont want

Apply all calculators