I am trying to implement a RAMPING fucntion (to imcrement values) and it wont work

I am trying to implement a function called void gradual_change(). This function will take two parameters (double) and and will assign them to two local variable called inner_previous_value and inner_current_value I am trying to step the value from previous to current but when I implement them my code goes crazy and don't knnow how to fix it

HERE IS MY CODE:

void gradual_change(double p, double c)
{
    double convert_coeff = 1000 * (7.31 - 2.048) / (16383 * 33.1);
    double ramping_return;
    double inner_previous_value = p;
    qDebug() << "Inner Previous Value: " << inner_previous_value;
    double inner_current_value = c;
    qDebug() << " Inner Current Value: " << inner_current_value;
    double inner_difference = abs(inner_current_value - inner_previous_value);
    qDebug() << "Inner Difference: " << inner_difference;

    double ramping_scale = (16383-100 / convert_coeff);
    qDebug() << "Ramping Scale: " << ramping_scale;
    // If the values are not equal write different current (inner_current_value)

    if(inner_previous_value != inner_current_value)
    {   // Here, we check if we need to ramp. if the value of the inner_previous_value is less than the ramping_scale
        // we simply make the previous value into the current value.
        if(inner_difference < ramping_scale)
        {
            inner_previous_value = inner_current_value;
            qDebug() << "CASE 1 - the previous current have been updated from " << p << "To " << inner_previous_value;
        }
        // Here, we create two possible cases when ramping up or ramping down.
        else
        {
            if((inner_previous_value < inner_current_value) && ((inner_previous_value!=ramping_scale)||inner_previous_value==ramping_scale))
            {
                qDebug() << "CASE 2 -  RAMPING UP";
                for(inner_previous_value; inner_previous_value < inner_current_value;)
                {
                    inner_previous_value=inner_previous_value-inner_current_value;
                    //qDebug()  << inner_previous_value;
                    if(inner_previous_value == inner_current_value)
                    {
                        qDebug() << "IN CASE 2 - ramping up - INNER PREVIOUS VALUE IS: " << inner_previous_value;

                        break;
                    }




                }
            }
            else //if(inner_previous_value > inner_current_value)
            {
                qDebug() << "Case 3 - Ramping Down";
                for(inner_previous_value; inner_previous_value > inner_current_value;)
                {
                    inner_previous_value =  inner_previous_value - inner_current_value;
                    if(inner_previous_value==inner_current_value)
                    {
                        break;
                    }

                }
            }
        }
    }


    ramping_return =  inner_previous_value;
    qDebug() << "RAMPING RETURN:  " << ramping_return;



}


int main(int argc, char *argv[])
{`enter code here`
    QCoreApplication a(argc, argv);
    while(1){
        cout << "Enter P, and C: " << endl;
        double p, c;
        cin >> p >> c;
        gradual_change(p,c);
    }


    return a.exec();
}

hope somebody could help me