15

%{

	#include<stdlib.h>
	#include<stdio.h>
	#include<string.h>

	struct sym
	{
	char name [10];
	}STAB[20];
	int m=0,k=0;






%}

%%
"#include"[ \t]*"<"|\"[ \t]*[^\n"][ \t]*">"|\" 	{ printf("\n #include found: %s",yytext);insert(yytext); }

"(" 						{ printf("\n Parenthesis: %s",yytext);}
")" 						{ printf("\n Parenthesis: %s",yytext);}
[0-9] 						{ printf("\n Number: %s",yytext);}
"int"|"float"|"char"|"double"|"main"		{ printf("\n Keyword: %s",yytext);insert(yytext);}
","						{ printf("\n Comma: %s",yytext);}
";"						{ printf("\n Semicolon: %s",yytext);}
"::"						{ printf("\n Scope resolution: %s",yytext);}
"*"|"+"|"-"|"/"					{ printf("\n Operator: %s",yytext);}
[
"//"[^\n]					{ printf("\n Single line Comment: %s",yytext);}
"/*"						{ printf("\n Multi line Comment Starts: %s",yytext);}
"*/"						{ printf("\n Single line Comment Ends: %s",yytext);}
%%


	int insert(char *yytext)
	{
	int i=0;
	int l,k;

	for(l=0; l<=m;l++)
		{

			if(strcmp(STAB[l].name,yytext)==0)
			{

			i=1;
			break;
			}

		}




	if(i==0)
		{
			printf("\nIdentifier not found. Inserting\n");
			strcpy(STAB[m].name,yytext);
			m++;
		}
	else
		printf("\nIdentifier found\n");



	}



main()
{
FILE *file;
file=fopen("code.c","r");
yyin=file;
yylex();
printf("Symbol table is:\n");

for(k=0;k<m;k++)
	printf("%s\n",STAB[k].name);

}