/* Transistor parameters */
#define DIODEDROP 0.6  /* volts */
#define BETA 10
#define VCE_SAT 0.2    /* volts */
#define RCE_SAT 50     /* ohms  */

void main()
{
    float Vcc, Vin, R1, R2;  /* circuit parameters */
    float Ib, Ic, Vce;       /* circuit conditions */

    if (Vin < DIODEDROP) {   /* cut off */
       Ib  = 0.0;
       Ic  = 0.0;
       Vce = Vcc;
    }
    else {                    /* active or saturated */
        Ib = (Vin - DIODEDROP) / R1;
        if ((Vcc - ((BETA * Ib) * R2)) >= VCE_SAT) {   /* active */
            Ic  = BETA * Ib;
            Vce = Vcc - (Ic * R2);
        }
        else {                /* saturated */
           Vce = VCE_SAT;
           Ic  = (Vcc - Vce) / (R2 + RCE_SAT);
        }
    }
}