%{
#include<stdio.h>
int lines=0, words=0, sl=0, cl=0, num=0, spl_chr=0, tot=0, in_word=0;
%}
 
%%
\n                  { lines++; in_word = 0; }
[ \t]+              { in_word = 0; }
[a-z]               { sl++; if (!in_word) { words++; in_word = 1; } }
[A-Z]               { cl++; if (!in_word) { words++; in_word = 1; } }
[0-9]               { num++; if (!in_word) { words++; in_word = 1; } }
.                   { spl_chr++; if (!in_word) { words++; in_word = 1; } }
<<EOF>>             { return 0; }
%%
 
main()
{
    yyin = fopen("ex.txt", "r");
    yylex();
    tot = sl + cl + num + spl_chr;
    printf("total no. of symbols : %d\n", tot);
    printf("no. of Lines: %d\n", lines);
    printf("no. of words: %d\n", words);
    printf("no. of lower case letters: %d\n", sl);
    printf("no. of upper case letters: %d\n", cl);
    printf("no. of special characters: %d\n", spl_chr);
    printf("no. of digits: %d\n", num);
}
 
int yywrap()
{
    return 1;
}

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SGVsbG8gV29ybGQhIDEyMwpUZXN0aW5nLg==

Hello World! 123
Testing.