dev-cpp-users

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

[Noorez K. <coo...@ho...>]

I am getting some very strange results with my program. The first error is 
that the input on the marked line, shows up on the next input line but has 
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 input 
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 = getche();
    cout << endl;
    text_color(cGreen, cBlack);

    if(ask == 'y' || ask == '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 = FALSE;
     text_color(cRed,cBlack);
     clrs=getche(); //the character entered hear...
     cout <<  endl;
     text_color(cGreen,cBlack);
     if(clrs == 'y' || clrs == 'Y')
     {
       cLrs = TRUE;
     }

     else if(clrs == 'n' || clrs == 'N')
     {
       cLrs = FALSE;
     }

     else
     {
       cout << "What...";
       cout << "Default is set. No Clear Screen!\n";
       cLrs = FALSE;
     }
     //return to main test
     sYstem(cLrs);
     wait();
     return 0;
    }

    else if(ask == 'n' || ask == 'N')
    {
      cout << "Bye!" << endl;
      wait();
      cls();
      return 0;
    }

    else
    {
      cout << "What....\n" << endl;
    }

  }while(ask != 'y' || ask != 'Y' || ask != 'n' || ask != 'N');

  return 0;
}

//define the system function
int sYstem(bool clrs)
{
  char* drv = 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 = new char;
    if(coms == 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 = strlen(coms);
    if(coms[comLen-1]== ':')
    {
        delete drv;
        drv = new char;
        drv = coms;
        chdir(coms);
        strcat(drv,"\\>");
        delete coms;
    }

    if( strcmp(coms,"exit")==0 || strcmp(coms,"bye")==0 ||
                        strcmp(coms,"quit")==0 )
    {
      if(clrs == TRUE)
      {
        cls();
      }
      return 0;
    }

    system(coms);
    delete coms;

    if(clrs == TRUE)
    {
      wait();
      cls();
    }

    cout << endl;
  }//while
}//end system def

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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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