#include <reg51.h>
void main(void)
  {
    unsigned char bcdbyte;
    unsigned char w='4';
    unsigned char z='7';
    w = w & 0x0F;   	
    w = w << 4;    	
    z = z & 0x0F;   	
    bcdbyte = w | z;	
    P1 = bcdbyte;
  }