[PIC] how to use tangent inverse in Mikro C for Pic

Code C - [expand]
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double X,Y,Zi,thetaa1;
int thetaa;
void SysInit();
double atan2(double y, double x);
void main(){
      X=2;
      Y=5;
      SysInit();
      while(1)
      {
        thetaa1= atan2(Y,X);
        thetaa = (int)(thetaa1*57.295);
        PORTB=thetaa;
      }
 
}
void SysInit()
{
  ADCON1=0x06;    // disable ADC and make all the pins of Port A as digital input
  TRISA=0xFF;
  PORTA=0x00;
  TRISB=0x00;
  PORTB=0x00;
  TRISD=0x00;
  PORTD=0x00;
  TRISE=0x00;
  PORTE=0x00;
  TRISC.B6=0;
  TRISC.B7=0;
  TRISC.B4=1;    // SDI input
  TRISC.B3=1;    // SCK input from master
  TRISC.B5=0;    // SDO output
  SSPSTAT.SMP=0; // input data sampled at middle
  SSPSTAT.CKE=0; // transition from idle to active
  //SPI1_Init_Advanced(_SPI_SLAVE_SS_ENABLE, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_LOW_2_HIGH);
}