6.cpp

编译原理的上机要求

//判断01串中是否含有连续1(有，则FALSE)
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#define BASELEN 10
#define INCRENTMENT 10

void main()
{
	char *p;
	FILE *fp;
	unsigned int Count_1=0;
	int i=0;
	int CurLen=0;
	int MaxLen=BASELEN;
	clrscr();
	if (!(fp=fopen("c:\\2.txt","r")))
	{
		printf ("Open file error.\n");
		exit(0);
	}
	if (!(p=(char*)malloc(sizeof(char)*BASELEN)))
	{
		printf ("Malloc Error.\n");
	}
	while(1)
	{
		if (CurLen==MaxLen)
		{
			MaxLen=MaxLen+INCRENTMENT;
			if (!(p=(char *)realloc(p,sizeof(char)*MaxLen)))
			{
				printf ("Realloc error.\n");
			}
		}
		fscanf(fp,"%c",p+i);
		if (*(p+i)=='\n') break;
		CurLen++;i++;
	}
	i=0;
	while(*(p+i)!='\n')
	{
		if (*(p+i)=='0')
			Count_1=0;
		else
			if (*(p+i)=='1')
			{
				if (++Count_1==2)
				{
					fclose(fp);
					free(p);
					printf ("FALSE.\n");
					return;
				}
			}
			else
				{
					fclose(fp);
          free(p);
					printf ("ERROR.\n");
					return;
				}
	i++;
	}
	if (i==0)
		printf ("ERROR.\n");
	else
        	printf ("TRUE.\n");
	fclose(fp);
	free(p);
}