plz query this program

#include<stdio.h>
#include<reg52.h>
#define XBYTE ((unsigned char volatile xdata*) 0

unsigned char  dummy = 0x55;
bit   bitValue;

void main (void)
{
        bitValue = dummy & 0x40;
        XBYTE[0x1234]= 0x55;
        return;
}

This program doesnt execute. plz query this program immediately.In the memory location the acc value is 0x55.