Hi, I am struggling with this program in my Programming Languages class. I also

Question

Hi, I am struggling with this program in my Programming Languages class.

I also can't figure out how to read my test file into the program. The test file is just called "Input.txt"

We are supposed to write a Lex input file that will produce a program that counts characters, words, and lines in a text file and reports the counts. Define a word to be any sequence of letters and/or digits, without punctuation or spaces. Punctuation and white space do not count as words. A sample output of the program is given :

Number of characters: 35747

Number of words: 5978

Number of lines: 150

Explanation / Answer

%{
#include<stdio.h>
int lines=0, words=0,s_letters=0,c_letters=0, num=0, spl_char=0,total=0;
%}
%%

{ lines++; words++;}
[ ' '] words++;
[A-Z] c_letters++;
[a-z] s_letters++;
[0-9] num++;

%%

main(void)
{
yyin= fopen("myfile.txt","r");
yylex();
total=s_letters+c_letters+num+spl_char;
printf(" This File contains ...");
printf(" %d lines", lines);
printf(" %d words",words);
printf(" %d small letters", s_letters);
printf(" %d capital letters",c_letters);
printf(" %d digits", num);
printf(" In total %d characters. ",total);
}

int yywrap()
{
return(1);
}

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