[Solved] calling method in c++ [closed]

by 


int operation(int op, int n1, int n2) {
    switch( op )
    {
        case 1:
            return subtraction(n1, n2);

        case 2:
            return multiplication(n1, n2);

        default:
            // default case, when the op value is neither 1 or 2
            cout << "Error! << endl;
            return 0;
    }
}

@Edit: Added default case as suggested below. Also, I think that you should make your variables name’s more descriptive.

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solved calling method in c++ [closed]