Basic Toggle Control For CSS Compiler

 
#include <16F877.h>
#device adc=8
#FUSES NOWDT ,XT                                        
#use delay(clock=4000000)
void main()
{
   set_tris_a(0xff);   
   set_tris_b(0x00);
   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   output_b(0x00);

while(true){
  if(!input(pin_a0)){ 
       output_toggle(pin_b0);
       delay_ms(100);
       while(!input(pin_a0));
      }     
  }
}