How do I go about this? Kindly write the code of the progam in the answer

/*lex program to count number of words*/
%{ 
#include<stdio.h> 
#include<string.h> 
int i = 0; 
%} 
  
/* Rules Section*/
%% 
([a-zA-Z0-9])*    {i++;} /* Rule for counting  
                          number of words*/
  
"\n" {printf("%d\n", i); i = 0;} 
%% 
  
int yywrap(void){} 
  
int main() 
{    
    // The function that starts the analysis 
    yylex(); 
  
    return 0; 
} 

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

\n { lines++; words++;}
[\t ' '] words++;
[A-Z] c_letters++;
[a-z] s_letters++;
[0-9] num++;
. spl_char++;
%%

main(void)
{
yyin= fopen("myfile.txt","r");
yylex();
total=s_letters+c_letters+num+spl_char;
printf(" This File contains ...");
printf("\n\t%d lines", lines);
printf("\n\t%d words",words);
printf("\n\t%d small letters", s_letters);
printf("\n\t%d capital letters",c_letters);
printf("\n\t%d digits", num);
printf("\n\t%d special characters",spl_char);
printf("\n\tIn total %d characters.\n",total);
}
 
int yywrap()
{
return(1);
}