parsing user commands into my progam

[xxhashxx]

lets say i have a class that computes the addition. substraction , powers of complex numbers.

currently to use the program i have to do this:

Complex A,B;
cin >> A;
cin >> B;

Complex C;
C = A+B;
cout << C;

is there a way in which i can allow the user to write their own commands during runtime i.e.

a = 1+2i
b = 2+3i
a = b
a = ?

does this have anything to do with shell programing?

[Bazzy]

You can write a simple parser, streams are helpful in this

does this have anything to do with shell programing?

No