Lex program to count the number of words, characters, blank spaces and lines in a file

/*Lex program to count the number of words, characters, blank spaces and lines in a C file.*/

 

 

%{

#include<stdio.h>

int count_lines=0, count_words=0,count_letters=0,S_letters=0, count_num=0, count_char=0,total=0;

%} 

 

%%

\n { count_lines++; count_words++;}

[\t ' '] count_words++;

[A-Z] c_letters++;

[a-z] s_letters++;

[0-9] count_num++;

. count_char++;

%%

void main()

{

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

yylex();

total=s_letters+count_letters+count_num+count_char;

printf(" This File contains ...");

printf("\n\t%d lines", count_lines);

printf("\n\t%d words",count_words);

printf("\n\t%d small letters", s_letters);

printf("\n\t%d capital letters",count_letters);

printf("\n\t%d digits", count_num);

printf("\n\t%d special characters",count_char);

printf("\n\tIn total %d characters.\n",total);

}

 

int yywrap()

{

return(1);

} 

//abc.txt file

output :