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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: Programming exercise/challenge
Date: Fri, 01 Jan 2021 08:24:31 -0800
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Rosario19 <Ros@invalid.invalid> writes:

> On Fri, 01 Jan 2021 10:09:16 +0100, Rosario19 <Ros@invalid.invalid>
> wrote:
> ...
>
> find one bug...
>
> the easy version does not handle case as
> /\
> \
> \* comment *\
>
>
> #include <stdio.h>
> main()
> {int c,cp,cpp;
>  for(cp='a';cp!=EOF&&(c=getchar())!=EOF;)
>    {if(c=='/')
>       {cp=c;
>             if((c=getchar())=='*') {for(;          (
> c=getchar())!=EOF;cp=c)if(cp=='*'&&c=='/')break;}
>        else if(c=='/')
> {for(;cp!='\n'&&(cp=getchar())!=EOF;    ); if(cp!=EOF)putchar(cp);}
>        else if(c==EOF)             {putchar(cp);      break;}
>        else                        {putchar(cp); putchar(c);}
>       }
>     else if(c=='\''||c=='\"')
>
> {for(putchar(c),cpp='a';(cp=getchar())!=EOF;cpp=cp,putchar(cp))if(cp==c&&cpp!='\\'){putchar(cp);break;}}
>     else  {putchar(c);cp=c;}
>    }
>  return 0;
> }
>
>
> the version handle case as
> /\
> \
> \* comment *\
>
> but change the code, make union of lines if find \\ \n
>
> #include <stdio.h>
> main() // use ungetc on stdin, remove \\n
> {int c,cp,cpp;
>  for(cp='a';cp!=EOF&&(c=getchar())!=EOF;)
>    {if(c=='*'&&cp=='/') {for(;(
> c=getchar())!=EOF;cp=c)if(cp=='*'&&c=='/')break;}
>     else if(c=='/')
>       {if(cp=='/') {for(;cp!='\n'&&(cp=getchar())!=EOF; );
> if(cp!=EOF)putchar(cp);}
>        else {cp=c;
>                   if((c=getchar())=='*') {for(;          (
> c=getchar())!=EOF;cp=c)if(cp=='*'&&c=='/')break;}
>              else if(c=='/')
> {for(;cp!='\n'&&(cp=getchar())!=EOF;    ); if(cp!=EOF)putchar(cp);}
>              else if(c==EOF)                   {putchar(cp);
> break;}
>              else if(c=='\\'||c=='\''||c=='\"') ungetc(c,stdin);
>              else                              {putchar(cp);
> putchar(c);}
>             }
>       }
>      else if(c=='\\'){cpp=cp;cp=c;
>                       if((c=getchar())==EOF){putchar(cp);break;}
>                       else if (c=='\n')           cp=cpp;        //
> unisce tutte le linee
>                       else
> {putchar(cp);putchar(c);}
>                      }
>     else
> if(c=='\''||c=='\"'){for(putchar(c),cpp='a';(cp=getchar())!=EOF;cpp=cp,putchar(cp))if(cp==c&&cpp!='\\'){putchar(cp);break;}}
>     else {putchar(c);cp=c;}
>    }
>  return 0;
> }

For future postings, I ask that you give main() a return type of int
(so 'int main(){ ... }'), and format the program using 'indent -kr'.
I have collected the programs you have posted so far, but may very
well ignore future submissions that look as awful as this.