PIC 16F886 ADC Problem

// ADC setup

VCFG = 0;                                              // Use Vdd as Ref  

ADFM = 1;                                              // Right justified A/D result

ADCS0 = 1;                                             // 16 TOSC prescale

ADCS1 = 0;

ADCS2 = 1;

CHS0 = 0;                                              // Channel select AN0

CHS1 = 0;

CHS2 = 0;

ADON = 1;                                              //Turn A/D on

unsigned int read_a2d(unsigned char channel){          // ADC channel

  channel &= 0x0F;                                     // Truncate channel to 4 bits

  ADCON0 &= 0b11000001;                                // Terminate and clear current channel select

  ADCON0 |= (channel << 2);                            // Apply the new channel select

  GO = 1;                                              // Initiate conversion on the selected channel

  while(GO) continue;                                  // Wait for ADC conversion to complete

  return((ADRESH << 8) + ADRESL);                      // Return result

}

void get_error(int desired){

  int adc = read_a2d(0)

  int error = desired - adc;

  if(error > 0){

    RC0 = 1;

    RC1 = 0;

  }

  else{

    RC0 = 0;

    RC1 = 1;

  }

  if(adc == 0)  RC2 = 1;

  else          RC2 = 0;

}