%{
/* Program to recognize a C program */
#include <stdio.h>
#include <stdlib.h>
int COMMENT = 0;
int cnt = 0;
%}
 
identifier [a-zA-Z][a-zA-Z0-9]*
 
%%
#.* { printf("\n%s is a PREPROCESSOR DIRECTIVE", yytext); }
int|float|char|double|while|for|do|if|break|continue|void|switch|case|long|struct|const|typedef|return|else|goto 
    { printf("\n\t%s is a KEYWORD", yytext); }
\/\* { COMMENT = 1; }
\*\/ { COMMENT = 0; cnt++; }
{identifier}\( { if (!COMMENT) printf("\n\nFUNCTION\n\t%s", yytext); }
\\{ { if (!COMMENT) printf("\nBLOCK BEGINS"); }
\\} { if (!COMMENT) printf("\nBLOCK ENDS"); }
{identifier}(\[[0-9]*\])? { if (!COMMENT) printf("\n%s IDENTIFIER", yytext); }
\".*\" { if (!COMMENT) printf("\n\t%s is a STRING", yytext); }
[0-9]+ { if (!COMMENT) printf("\n\t%s is a NUMBER", yytext); }
\)(\;)? { if (!COMMENT) printf("\n\t"); ECHO; printf("\n"); }
= { if (!COMMENT) printf("\n\t%s is an ASSIGNMENT OPERATOR", yytext); }
\<=|\>=|\<|==|\> { if (!COMMENT) printf("\n\t%s is a RELATIONAL OPERATOR", yytext); }
%%
 
int main(int argc, char **argv) {
    if (argc > 1) {
        FILE *file;
        file = fopen(argv[1], "r");
        if (!file) {
            printf("Could not open %s\n", argv[1]);
            exit(0);
        }
        yyin = file;
    }
    yylex();
    printf("\n\nTotal No. of comments are %d", cnt);
    return 0;
}
 
int yywrap() {
    return 1;
}
 

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I2luY2x1ZGUmYW1wO2x0O3N0ZGlvLmgmYW1wO2d0OwptYWluKCkKewppbnQgYSxiOwp9

#include<stdio.h>
main()
{
int a,b;
}