Dev - C++ - Controlar la ventas realizadas en dev c++

#include <iostream>

#include <cctype>

using namespace std;

int main()

{

    float importe, total;

    float coop, efec, tar, iva;

    char c;

    coop = efec = tar = 0.0f;

    do {

        cout << "\nImporte: "; cin >> importe;

        cout << "Codigo (C, E, T, F): ";  cin >> c;

        c = toupper(c);

        switch (c)

        {

            case 'C':

                coop += importe - importe * 0.30f;

                break;

            case 'E':

                efec += importe - importe * 0.10f;

                break;

            case 'T':

                tar += importe + importe * 0.12f;

                break;

            case 'F':

                cout << "\n\nCIERRE DE CAJA" << endl;

                break;

            default:

                cout << "\n\nOPCION NO VALIDA" << endl;

                break;

        }

    } while (c != 'F');

    total = efec + coop + tar;

    cout << "\nEfectivo en Caja: " << efec + coop;

    cout << "\nVentas con Tarjeta: " << tar;

    cout << "\nTotal venta: " << total;

    cout << "\nIva 21%: " << total * 0.21;

    cout << "\nTotal: " << total - total * 0.21;

    cout << endl;

    return 0;

}