Program to count the no of comment line in a given C program. Also eliminate them and copy that program into separate file . | Compiler Design Lab Programs | Lex Programs

Compiler Design Lap Program :

%{

 #include<stdio.h>

 int com=0;

%}

%s COMMENT

%%

“/*”[.]*”*/” {com++;}

“/*” {BEGIN COMMENT ;}

<COMMENT>”*/” {BEGIN 0; com++ ;}

<COMMENT>\n {com++ ;}

<COMMENT>. {;}

.|\n {fprintf(yyout,”%s”,yytext);

%%

int yywrap()

{

return 1;

}

main(int argc, char *argv[])

{

 If(argc!=2)

 {

 printf(“Usage: <./a.out> <sourcefile> <destn file>\n”);

 exit(0);

 }

 yyin=fopen(argv[1],”r”);

 yyout=fopen(argv[2],”w”);

 yylex();

 printf(“No of comment lines=%d\n”,com);

}