applying equations on ADC samples in mikroC

unsigned int V, Itotal, Ifund;
unsigned long Swith_harmonic;
double Iharmonic, Qharmonic, distAngle, TrueActPwr ;


V = ADC_Read(channel_V); // channel_V is the analog channel where you give the V input;
Itotal = ADC_Read(channel_It);
Ifund = ADC_Read(channel_If);

Swith_harmonic = V * Itotal;

Iharmonic = sqrt((Itotal * Itotal) - (Ifund * Ifund)); // Select the C_Math library for using this function

Qharmonic = V * Iharmonic;

distAngle = asin(Qharmonic  / Swith_harmonic);

TrueActPwr = Swith_harmonic * cos(distAngle);

unsigned int V, Itotal, Ifund;
unsigned long Swith_harmonic;
double Iharmonic, Qharmonic,a, distAngle, TrueActPwr ;

void main()
{
  ADCON1 = 0x80;  // Configure analog inputs and Vref
  TRISA  = 0xFF;  // PORTA is input
  TRISB  = 0x3F;  // Pins RB7, RB6 are outputs
  TRISD  = 0;     // PORTD is output
do
{

V = ADC_Read(0); // channel_V is the analog channel where you give the V input;

Itotal = ADC_Read(1);

Ifund = ADC_Read(2);

V = (V%1024)*5;

Itotal = (Itotal%1024)*5;

Ifund = (Ifund%1024)*5;

Swith_harmonic = V * Itotal;

Iharmonic = sqrt((Itotal * Itotal) - (Ifund * Ifund)); // Select the C_Math library for using this function

Qharmonic = V * Iharmonic;

distAngle = asin(Qharmonic  / Swith_harmonic);

TrueActPwr = Swith_harmonic * cos(distAngle);

PORTD = TrueActPwr;


  } while(1);
}