5-18.c

一些简单的c51程序

#include<stdio.h>
#include <reg51.h> 
char *month_name(int n)
       {
          static char *name[]={
               "Illegal month",
               "January",
               "February",
               "March",
               "April",
               "May",
               "June",
               "July",
               "August",
               "September",
               "October",
               "November",
               "December"
          };
          return((n<1||n>12)?name[0]:name[n]);
     }
     main()
     {
          int i;
          SCON = 0x50; 
TMOD |= 0x20; 
TH1 = 0xf3; 
TR1 = 1;
TI = 1;
		  
		  
		  for(i=0;i<13;i++)
               printf("%s\n", month_name(i));

     }