/* Program 3-12 shows how to test bit D0 to see if it is high */
#include 	<stdio.h>
main()

{
unsigned char status;
unsigned char temp;
printf("\nType in a Hex value\n");
scanf("%X",&status);		//get the data
temp=status&0x01;               //mask all bits except DO
if (temp==0x01)                 //is it high?
   printf("D0 is high");        //if yes, say so
else printf("D0 is low");       //if no, say so
}