Write a LEX program that reads program from input file and counts number of letters, words, lines from it. Resulting count should be written to output file.

              

               Code :

%{

#include<stdio.h>

int lines=0, words=0,letters=0;

%}

%%

\n {lines++; words++;}  

[\t ' '] {words++;}

[A-Za-z] {letters++;}

%%

main()

{

yyin=fopen("input.txt","r");

yyout=fopen("output.txt","w");

yylex();

fprintf(yyout,"\n\t%d lines",lines);

fprintf(yyout,"\n\t%d words",words);

fprintf(yyout,"\n\t%d letters",letters);

}

int yywrap()

{

return(1);

}