#include<stdio.h>#include<string.h>char ch,token[8],prog[80];int syn,p,m,n,sum;char *rwtab[6]={"begin","if","then","while","do","end"};void scaner();main(){	p=0;	printf("请输入一个字符串(输入#表示结束):");	do{		scanf("%c",&ch);		prog[p++]=ch;	}while(ch!=#);	p=0;	do{		scaner();		switch(syn)		{		case 11:printf("%-10d%5d\n",sum,syn);			break;		case -1:printf("输入的字符串有误!\n");			getch();			exit(0);		default:printf("%-10s%5d\n",token,syn);			break;		}	}while(syn!=0);	getch();}void scaner(){	sum=0;	for(m=0;m<8;m++)		token[m++]=NULL;	ch=prog[p++];	m=0;    while((ch==‘ ‘)||(ch==‘\n‘))		ch=prog[p++];	if(((ch<=‘z‘)&&(ch>=‘a‘))||((ch<=‘Z‘)&&(ch>=‘A‘)))	{		while(((ch<=‘z‘)&&(ch>=‘a‘))||((ch<=‘Z‘)&&(ch>=‘A‘))||((ch>=‘0‘)&&(ch<=‘9‘)))		{			token[m++]=ch;			ch=prog[p++];		}		p--;		syn=10;		for(n=0;n<6;n++)			if(strcmp(token,rwtab[n])==0)			{				syn=n+1;				break;			}	}	else if((ch>=‘0‘)&&(ch<=‘9‘))	{		while((ch>=‘0‘)&&(ch<=‘9‘))		{			sum=sum*10+ch-‘0‘;			ch=prog[p++];		}		p--;		syn=11;	}	else switch(ch)	{		case ‘<‘:token[m++]=ch;			ch=prog[p++];			if(ch==‘=‘)			{				syn=22;				token[m++]=ch;			}			else			{				syn=20;				p--;			}			break;		case ‘>‘:token[m++]=ch;			ch=prog[p++];			if(ch==‘=‘)			{				syn=24;				token[m++]=ch;			}			else			{				syn=23;				p--;			}			break;		case ‘+‘: token[m++]=ch;			ch=prog[p++];			if(ch==‘+‘)			{				syn=17;				token[m++]=ch;			}			else			{				syn=13;				p--;			}			break;		case ‘-‘:token[m++]=ch;			ch=prog[p++];			if(ch==‘-‘)			{				syn=29;				token[m++]=ch;			}			else			{				syn=14;				p--;			}			break;		case ‘!‘:ch=prog[p++];			ch=prog[p++];			if(ch==‘=‘)			{				syn=21;				token[m++]=ch;			}			else			{				syn=31;				p--;			}			break;		case ‘=‘:token[m++]=ch;			ch=prog[p++];			if(ch==‘=‘)			{				syn=25;				token[m++]=ch;			}			else			{				syn=18;				p--;			}			break;	}}