/*** Definition Section has one variable
which can be accessed inside yylex() 
and main() ***/
%{
int count = 0;
%}
 
/*** Rule Section has three rules, first rule 
matches with capital letters, second rule
matches with any character except newline and 
third rule does not take input after the enter***/
%%
[A-Z] {printf("%s capital letter\n", yytext);
       count++;}
.     {printf("%s not a capital letter\n", yytext);}
\n    {return 0;}
%%
 
/*** Code Section prints the number of
capital letter present in the given input***/
int yywrap(){}
int main(){
 
// Explanation:
// yywrap() - wraps the above rule section
/* yyin - takes the file pointer 
          which contains the input*/
/* yylex() - this is the main flex function
          which runs the Rule Section*/
// yytext is the text in the buffer
 
// Uncomment the lines below 
// to take input from file
// FILE *fp;
// char filename[50];
// printf("Enter the filename: \n");
// scanf("%s",filename);
// fp = fopen(filename,"r");
// yyin = fp;
 
yylex();
printf("\nNumber of Capital letters " 
      "in the given input - %d\n", count);
 
return 0;
}
 

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