Re: [Dev-C++] errors with i/o

[Per W. <pw...@ia...>]

So the reason you never give feedback to received answers - you never read
them...

Be _very_ careful about mixing FILE-based and stream-based input and/or
output to the _same_ stream, since the C library and the C++ stream
library have their own input/output buffer code. When mixing them, serious
problems with interaction may/will follow. Regularly flushing the streams
may help the problem, but the best solution is to not mix the two
input/output methods!

/Per W

On Fri, 3 Sep 2004, Noorez Kassam wrote:

> I am getting some very strange results with my program. The first error i=
s
> that the input on the marked line, shows up on the next input line but ha=
s
> not been entered. I used getch() to fix that but what went wrong?
>
> Next error. If I enter 'y' for the auto clear screen then the marked inpu=
t
> line acts as if there was an input on each round of the main loop. If the
> answer was 'n' it only skips once.
>
> I tried debugging but still nothing...
>
> #include <iostream>
> #include <cstdlib>
> #include <direct.h>
> #include <string>
> #include <myfs.h>
> #include <conio.h>
> using namespace std;
> using namespace myf;
>
> int sYstem(bool clrs);
> int main()
> {
>   console_init();
>   cursor_position(15,10);
>   text_color(cGreen,cBlack);
>   cout << "WELCOME TO EASY TO USE DOS-PROMPT\n";
>   wait();
>   cls();
>   cout << "Easy to use dos-prompt!" << endl;
>
>   cout << "\nTo quit you can use any one of the following commands: " <<
> endl
>        << "quit, bye, exit" << endl << endl;
>
>
>   char ask;
>   do
>   {
>     cout << "Would you like to enter the system? [Y\\N] ";
>     text_color(cRed,cBlack);
>     ask =3D getche();
>     cout << endl;
>     text_color(cGreen, cBlack);
>
>     if(ask =3D=3D 'y' || ask =3D=3D 'Y')
>     {//main if
>
>      cout << "\nYou can also have the program Clear Screen automaticly"
>           <<  " after each command.\n";
>      cout << "Is this Ok [Y\\N] ";
>
>      char clrs;
>      bool cLrs =3D FALSE;
>      text_color(cRed,cBlack);
>      clrs=3Dgetche(); //the character entered hear...
>      cout <<  endl;
>      text_color(cGreen,cBlack);
>      if(clrs =3D=3D 'y' || clrs =3D=3D 'Y')
>      {
>        cLrs =3D TRUE;
>      }
>
>      else if(clrs =3D=3D 'n' || clrs =3D=3D 'N')
>      {
>        cLrs =3D FALSE;
>      }
>
>      else
>      {
>        cout << "What...";
>        cout << "Default is set. No Clear Screen!\n";
>        cLrs =3D FALSE;
>      }
>      //return to main test
>      sYstem(cLrs);
>      wait();
>      return 0;
>     }
>
>     else if(ask =3D=3D 'n' || ask =3D=3D 'N')
>     {
>       cout << "Bye!" << endl;
>       wait();
>       cls();
>       return 0;
>     }
>
>     else
>     {
>       cout << "What....\n" << endl;
>     }
>
>   }while(ask !=3D 'y' || ask !=3D 'Y' || ask !=3D 'n' || ask !=3D 'N');
>
>   return 0;
> }
>
> //define the system function
> int sYstem(bool clrs)
> {
>   char* drv =3D new char;
>   cout << "\nEnter the name of the drive you want to go to: ";
>   text_color(cRed,cBlack);
>   cin.getline(drv,123); //comes out hear but enter key not pushed.
>   text_color(cGreen,cBlack);
>   strcat(drv,":\\");
>   chdir(drv);
>
>   cout << "Now in drive " << drv << endl;
>   cout << "You may type in commands" << endl;
>   wait();
>   cout << '\n';
>   strcat(drv,">");
>
>   char* coms;
>
>   while(1)
>   {
>     coms =3D new char;
>     if(coms =3D=3D NULL)
>     {
>         cout << "No memory\n";
>         wait();
>         exit(1);
>         return 0;
>     }
>     cout << drv;
>     text_color(cRed,cBlack);
>     cin.getline(coms,124); //line is skipped if clear screen answer is y =
and
> goes back to the top of the main loop.
>     text_color(cGreen,cBlack);
>
>     int comLen =3D strlen(coms);
>     if(coms[comLen-1]=3D=3D ':')
>     {
>         delete drv;
>         drv =3D new char;
>         drv =3D coms;
>         chdir(coms);
>         strcat(drv,"\\>");
>         delete coms;
>     }
>
>     if( strcmp(coms,"exit")=3D=3D0 || strcmp(coms,"bye")=3D=3D0 ||
>                         strcmp(coms,"quit")=3D=3D0 )
>     {
>       if(clrs =3D=3D TRUE)
>       {
>         cls();
>       }
>       return 0;
>     }
>
>     system(coms);
>     delete coms;
>
>     if(clrs =3D=3D TRUE)
>     {
>       wait();
>       cls();
>     }
>
>     cout << endl;
>   }//while
> }//end system def
>
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