trial

%{
#include "y.tab.h"
extern char * yylval;
int x=0;
%}
%%
"int" {x++;return INT;}
"float" {x++;return FLOAT;}
"char" {x++; return CHAR;}
"double" {x++;return DOUBLE;}
[a-z]+ {yylval=yytext;if(x>0) {return ID;} return 0;}
"," return C;
[n] return NL;
";" {x--;return SE;}
%%

%{
	#include<stdio.h>
	#include<string.h>
	int err_no=0,fl=0,i=0,j=0,type[100];
	char symbol[100][100],temp[100];
%}
%token ID NL SE C INT FLOAT CHAR DOUBLE
%%
START:S1 NL {return;}
;
S1:	S NL S1
	|S NL
;
S: 	INT L1 SE
	|FLOAT L2 SE
	|CHAR L3 SE
	|DOUBLE L4 SE
	|INT L1 SE S
	|FLOAT L2 SE S
	|CHAR L3 SE S
	|DOUBLE L4 SE S
	
L1:	L1 C ID{strcpy(temp,(char *)$3); insert(0);}
	|ID{strcpy(temp,(char *)$1); insert(0);}
	;
L2:	L2 C ID{strcpy(temp,(char *)$3); insert(1);}
	|ID{strcpy(temp,(char *)$1); insert(1);}
	;
L3:	L3 C ID{strcpy(temp,(char *)$3); insert(2);}
	|ID{strcpy(temp,(char *)$1); insert(2);}
	;
L4:	L4 C ID{strcpy(temp,(char *)$3); insert(3);}
	|ID{strcpy(temp,(char *)$1); insert(3);}
	;
E:	SE
	;
%%
void yyerror(const char *str) {printf("error");}
int yywrap(){return 1;}
main()
{
	yyparse();
	if(err_no==0)
	{
		for(j=0;j<i;j++)
		{
			if(type[j]==0) printf("INT-");
			if(type[j]==1) printf("FLOAT-");
			if(type[j]==2) printf("CHAR-");
			if(type[j]==3) printf("DOUBLE-");
			printf("%sn",symbol[j]);
		}
	}
}
void insert(int type1)
{
	fl=0;
	for(j=0;j<i;j++)
	{
		if(strcmp(temp,symbol[j])==0)
		{
			if(type[i]==type1) printf("Redeclaration of variable");
			else {printf("Multiple Declaration of Variable");err_no=1;}
			fl=1;
		}
		if(fl==0)
		{
			type[i]=type1;
			strcpy(symbol[i],temp);
			i++;
		}
	}
}