5-11.c

一些简单的c51程序

#include <stdio.h>
#include <reg51.h> 

 main()
        {
          union{ 
               int i;
               

	   
			   struct{ 
                    char first;
                    char second;
               }half;
          }number;
          number.i=0x4241;

		  SCON = 0x50; 
TMOD |= 0x20; 
TH1 = 0xf3; 
TR1 = 1;
TI = 1; 
          printf("%c%c\n",number.half.first,number.half.second);
          number.half.first='a';
          number.half.second='b';
          printf("%x\n",number.i);
          getchar();
     }