4-1.c

一些简单的c51程序

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

int exit();
main(int argc,char *argv[])

{
     SCON = 0x50; 
TMOD |= 0x20; 
TH1 = 0xf3; 
TR1 = 1;
TI = 1; 
	 
	 if(argc!=3)                          //如果命令行参数不为3，则退出
{
printf("you should enter two string\n");
//     exit(0);
     }
     if(strcmp(argv[1],argv[2])<0) 
     printf("%s比%s小",argv[1],argv[2]);
else if(strcmp(argv[1],argv[2])==0)
     printf("%s和%s相等",argv[1],argv[2]);
       else printf("%s比%s大",argv[1],argv[2]);
}