#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char prog[100],ch,token[8];
int p=0,syn,n,i;
char *keyword[6]={"begin","then","if","while","do","end"};
void scaner();
void Irparse();
void statement();
void expression_r();
void term();
void factor();
void main()
{
int select=-1;
p=0;
printf("please input sentence, end of '#' !
");
do
{
ch=getchar();
prog[p++]=ch;
}while(ch!='#');
p=0;
printf("请输入1 或 2
1.词法分析
2.语法分析
");
scanf("%d",&select);
if(select==1)
{
do
{
scaner();
switch(syn)
{
case -1:printf("词法分析 出错
");break;
default :printf("<%d,%s>
",syn,token);break;
}
}while(syn!=0);
printf("词法分析 成功
");
}
else if(select==2)
{
scaner();
if(syn==1)
{Irparse();}//begin
else
{printf("语法分析出错! 请检查begin关键字
");return;}
if(syn==6)//end
{
scaner();
if(syn==0)
{
printf("恭喜 语法分析 成功
");
}
else
{printf("语法分析出错! 请检查是否缺少'#'
");}
}
else{printf("语法分析出错! 请检查是否缺少'end'
");}
}
getchar();
}
void scaner()
{
for(n=0;n<8;n++)
{token[n]='
