skymansandy

%{
#include <stdio.h>
#include<stdlib.h>
%} 
%token ALPHA    NUMBER    ENTER    ER 
%% 
var:v ENTER 	  {printf("Valid Variable\n");exit(0);} 
v:ALPHA exp1 
exp1:ALPHA exp1 
|NUMBER exp1 

skymansandy

%{ 
#include "y.tab.h" 
%} 
%% 
[a-zA-z_]    {return ALPHA;} 
[0-9]+         {return NUMBER;} 
"\n"             { return ENTER;} 
.                  {return ER;} 
%%
yywrap()

skymansandy

%{
/* 4a.y Yacc Program to check the validity of an arithmetic Expression that uses operators +, -, *, /
*/
#include<stdio.h>
#include<stdlib.h>
%}
%token NUM  ID
%left '+' '-'
%left '*' '/'
%%

skymansandy

%{
/* 4a.l Yacc Program to check the validity of an arithmetic Expression that uses operators +, -, *, /
*/
#include "y.tab.h"
%}
%%
[0-9]+(\.[0-9]+)?     		{ return NUM;}
[a-zA-Z_][_a-zA-Z0-9]* 	{ return ID; }
[\t] 				;
\n 				return 0;

skymansandy

%{
#include<stdio.h>
#include<string.h>
int flag=0,cnt=0;
char str[50];
%}
%%
(int\  )|(char\  )|(float\  )|(double\  )(short\ )(long\ )(unsigned\ )	{flag=1;}
[a-zA-Z_][A-Za-z0-9_]*[,=\[;]          				{if(flag==1)
				           					{     	cnt++;

skymansandy

%{
int flag=0;
%}
%%
.+[ \t]+[Aa][Nn][Dd][ \t]+.+						{flag=1;}
.+[ \t]+[Oo][Rr][ \t]+.+							{flag=1;}
.+[ \t]+[Bb][Uu][Tt][ \t]+.+						{flag=1;}
.+[ \t]+[Bb][eE][Cc][Aa][Uu][Ss][Ee][ \t]+.+				{flag=1;}
.+[ \t]+[Nn][Ee][Vv][Ee][Rr][Tt][Hh][Ee][Ll][Ee][Ss][Ss][ \t]+.+	{flag=1;}
. 										;

skymansandy

%{
int a[]={0,0,0,0},i,valid=1,opnd=0;
%}
%x OPER
%%
[a-zA-Z0-9]+ 			{ BEGIN OPER; opnd++;}
<OPER>"+" 			{ if(valid) { valid=0;i=0;} else ext();}
<OPER>"-" 			{ if(valid) { valid=0;i=1;} else ext();}
<OPER>"*" 			{ if(valid) { valid=0;i=2;} else ext();}
<OPER>"/" 			{ if(valid) { valid=0;i=3;} else ext();}

skymansandy

%{
int cc=0;
%}
%x CMNT 
%%
"/*"    		{BEGIN CMNT; }
<CMNT>. 	;
<CMNT>\n	;
<CMNT>"*/"	{BEGIN 0; cc++;}
.*”//”.*		{BEGIN 0; cc++;}

skymansandy

%{
int wc=0,cc=0,lc=0,bc=0;
char infile[25];
%}
word    [^  \t\n]+
eol        \n
%%
{word}	 	{wc++; cc+=yyleng;}
{eol} 		{lc++; cc++; }
[   ]		 {bc++; cc++; }

skymansandy

DELAY PROC
         PUSH CX
         PUSH BX
         MOV CX, 0FFFFH
B1:  MOV BX, 0FFFFH
B2:  DEC BX
       JNZ B2
       LOOP B1
       POP BX
       POP CX