#include <P18F458.h>
#define PB0 PORTBbits.RB0
void main(void)
  { 
    unsigned char x;
    unsigned char REGA=0;
    TRISBbits.TRISB0 = 1;	
    TRISD = 0;			
    for(x=0;x<8;x++)
      {
       REGA = REGA << 1;
       REGA |= PB0 & 0x01;
      }
    PORTD = REGA; 
  }