PIC 12F675 Comparator, Few Questions .

// Definitions
#define COMPARATOR_OP 2
#define LED 4

///////////////////////////////////////////////////////
void init_ports(void) {
   //GP0 & GP1 are inputs
   TRISIO = 0 | (1<<GP0) | (1<<GP1); // 0 - op, 1 - ip

   ANSEL = (1<<GP0) | (1<<GP1); ; // Ana. ip on GP0 GP1
}

///////////////////////////////////////////////////////
void init_comparator(void) {
   // Comparator with external input and output.
   // Cout = 0 (comparator output), Cinv =0 (inversion)

   [COLOR="#ff0000"][B]CMCON = 0x01;[/B][/COLOR]

}

///////////////////////////////////////////////////////
// Start here
void main() {
int i;

   init_ports();

   // Show device is active on power up.
   for (i=0;i<5;i++) {

      GPIO |= (1<<COMPARATOR_OP);
      delay_ms(100);

      GPIO &= ~(1<<COMPARATOR_OP);
      delay_ms(100);
   }

   init_comparator();

   while(1) {;
      GPIO |= (1<<LED);
      delay_ms(100);

      GPIO &= ~(1<<LED);
      delay_ms(100);
   }
}

switch (GPIO.F2) {
      case (0) : GPIO.F3=0;
      case (1) : GPIO.F3=1; delay_ms(500); GPIO.F3=0; delay_ms(500);
                  }

void init_ports(void) {

   TRISA = 0x0F; // RA.0:RA.3 INPUTS
                 // RA.4:RA.7 OUTPUTS
}

void init_comparator(void) {
   // Both Comparators with external input and output.

   CMCON = 0x04;
}

// Start here
void main() {
int i;
//
   init_ports();
//
//   // Show device is active on power up.
   for (i=0;i<5;i++) {

      PORTA.F2 = 1;
      delay_ms(100);

      PORTA.F2 = 0;
      delay_ms(100);
   }


   init_comparator();

   while(1) {;
   
      PORTA.F6=1;delay_ms(500);PORTA.F6=0; delay_ms(500);

                           }
}