Go4Expert - I am in need of some assistance

Hi guys,
i recieved a code from an old programer, the part of the code looks like this:

Code:

void set_PID_i_factor(UINT8 PID_number,UINT16 timeMS)

{

    UINT8 vrsta = PID_number;

    UINT16 barka;

    UINT32 temp_i = (UINT32)izpisi16(nvvar,set_PID_p_factor(PID_number)) * timeMS; // what does this part of the code do ? i dont get it . . .  :(

    switch(PID_number){

      case 0:

          barka = aGS_RTKC_I_WP;

          break;

      case 1:

          barka = aGS_RTKH_I_WP;

          break;

      case 2:

          barka = aGS_RTPK_I_WP;

          break;

      case 3:

          barka = aGS_RTPF_I_WP;

          break;

      case 4:

          barka = aGS_RTPC_I_WP;

          break;

      case 5:

          barka = aGS_RTPH_I_WP;

          break;

    }



    barka = izpisi16(nvvar,barka); // // what does this part of the code do ? i dont get it . . .  :(

    if(!barka) pid_data[vrsta].i_fact = 0;

    else {

        temp_i = temp_i * 256 /barka;

        pid_data[vrsta].i_fact = temp_i; // /10;

    }

}

I understood that barke is equal to parameter_I_value and that vrsta is equal to PID_number. I dont understand why he delared vrsta and then set the value of vrsta with the value that has PID_number. Isnt it easyer to use just PID_number?

Thanks for your help,
best regards,
BoSCHoW.