LEX program to count the numbers of comment lines in a given C program

Q.Write a LEX  program to count the numbers of comment lines in a given C program. Also eliminate them and copy the resulting program into separate file.

Source code:->

%{

int com=0;

%}

%%

"/*"[^\n]+"*/" {com++;fprintf(yyout, " ");}

%%

int main()

{

printf("Write a C program\n");

yyout=fopen("output", "w");

yylex();

printf("Comment=%d\n",com);

return 0;

}

Ouput:->

$lex p1b.l

$cc lex.yy.c –ll

$./a.out

       Write a C program

                     #include<stdio.h>

                       int main()

                        {

                         int a, b;

                           /*float c;*/

                          printf(“Hai”);

                          /*printf(“Hello”);*/

                            }

[Ctrl-d]

Comment=2

$cat output

#include<stdio.h>

int main()

{

    int a, b;

    printf(“Hai”);

}

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