LEX PROGRAM to recognize and count the no of identifiers in a given input file.

 program to recognize and count the no of identifiers in a given input file.

%{

#include<stdio.h>

int c=0;

char ch;

%}

%%

"int"|"float"|"double"|"long"|"short" {while(1)

{

ch=input();

if(ch==',')

c++;

else

if(ch==';')

c++;

break;

};}

. {;}

[\n] {;}

[a-z]+ {;}

%%

int main(int argc,char *argv[])

{

yyin=fopen(argv[1],"r");

yylex();

printf("count %d\n",c);

fclose(yyin);

}