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doubt in clrscr

Sun, 06 Apr 2003 22:11:06 -0700

Hai friends,
Iam using Turbo Pascal 7.0.

In this simple program:

program test(input,output);
begin
clrscr;
writeln;
Writeln('Hello');
Readln;
end.

Here, in this program in line 3 (ie) clrscr;

Its giving an error saying unknown identifier.

I want to clear the screen and show the output.

Kindly advice me as regards this.

Regards
Uma.

Re: doubt in clrscr

Sun, 06 Apr 2003 23:16:16 -0700

: Hai friends,
: Iam using Turbo Pascal 7.0.
:
: In this simple program:
:
: program test(input,output);
: begin
: clrscr;
: writeln;
: Writeln('Hello');
: Readln;
: end.
:
: Here, in this program in line 3 (ie) clrscr;
:
: Its giving an error saying unknown identifier.
:
: I want to clear the screen and show the output.
:
: Kindly advice me as regards this.
:
: Regards
: Uma.
:
If you look at the help file page on the clrscr procedure, you will see that it is located in the Crt or WinCrt unit. Your program needs to use this unit to compile correctly.
Hint: An unknown identifier always happens because of one of three reasons. Here they are with their solutions:
- The unit which holds the identifier is not in the uses list. Solution: add the unit to the uses list.
- A typing error was made in the identifier. Solution: correct the error.
- The identifier is truly unknown. Solution: declare the identifier before the line in which it is used.

Re: doubt in clrscr

Mon, 07 Apr 2003 01:35:16 -0700

: : Hai friends,
: : Iam using Turbo Pascal 7.0.
: :
: : In this simple program:
: :
: : program test(input,output);
: : begin
: : clrscr;
: : writeln;
: : Writeln('Hello');
: : Readln;
: : end.
: :
: : Here, in this program in line 3 (ie) clrscr;
: :
: : Its giving an error saying unknown identifier.
: :
: : I want to clear the screen and show the output.
: :
: : Kindly advice me as regards this.
: :
: : Regards
: : Uma.
: :
: If you look at the help file page on the clrscr procedure, you will see that it is located in the Crt or WinCrt unit. Your program needs to use this unit to compile correctly.
: Hint: An unknown identifier always happens because of one of three reasons. Here they are with their solutions:
: - The unit which holds the identifier is not in the uses list. Solution: add the unit to the uses list.
: - A typing error was made in the identifier. Solution: correct the error.
: - The identifier is truly unknown. Solution: declare the identifier before the line in which it is used.
:

Hai,
Thanx for ur reply. But I have added uses Crt in the program

(ie)
program test(input,output);
uses Crt;
begin
clrscr;
writeln;
Writeln('Hello');
Readln;
end.

But its giving a runtime error as Division by zero for this. Plz help me as Iam desperate.

Re: doubt in clrscr

Mon, 07 Apr 2003 01:54:03 -0700

: : : Hai friends,
: : : Iam using Turbo Pascal 7.0.
: : :
: : : In this simple program:
: : :
: : : program test(input,output);
: : : begin
: : : clrscr;
: : : writeln;
: : : Writeln('Hello');
: : : Readln;
: : : end.
: : :
: : : Here, in this program in line 3 (ie) clrscr;
: : :
: : : Its giving an error saying unknown identifier.
: : :
: : : I want to clear the screen and show the output.
: : :
: : : Kindly advice me as regards this.
: : :
: : : Regards
: : : Uma.
: : :
: : If you look at the help file page on the clrscr procedure, you will see that it is located in the Crt or WinCrt unit. Your program needs to use this unit to compile correctly.
: : Hint: An unknown identifier always happens because of one of three reasons. Here they are with their solutions:
: : - The unit which holds the identifier is not in the uses list. Solution: add the unit to the uses list.
: : - A typing error was made in the identifier. Solution: correct the error.
: : - The identifier is truly unknown. Solution: declare the identifier before the line in which it is used.
: :
:
:
:
:
:
:
: Hai,
: Thanx for ur reply. But I have added uses Crt in the program
:
: (ie)
: program test(input,output);
: uses Crt;
: begin
: clrscr;
: writeln;
: Writeln('Hello');
: Readln;
: end.
:
:
: But its giving a runtime error as Division by zero for this. Plz help me as Iam desperate.
:
:
:
:
Under several newer windows versions the crt gives that error. There are several patches on the internet. You can find them using google with "turbo pascal crt patch" search string.
If you don't want to patch your crt, you can always writeln() 25 empty lines onto your screen.

Re: doubt in clrscr

Mon, 07 Apr 2003 19:34:49 -0700

: : : : Hai friends,
: : : : Iam using Turbo Pascal 7.0.
: : : :
: : : : In this simple program:
: : : :
: : : : program test(input,output);
: : : : begin
: : : : clrscr;
: : : : writeln;
: : : : Writeln('Hello');
: : : : Readln;
: : : : end.
: : : :
: : : : Here, in this program in line 3 (ie) clrscr;
: : : :
: : : : Its giving an error saying unknown identifier.
: : : :
: : : : I want to clear the screen and show the output.
: : : :
: : : : Kindly advice me as regards this.
: : : :
: : : : Regards
: : : : Uma.
: : : :
: : : If you look at the help file page on the clrscr procedure, you will see that it is located in the Crt or WinCrt unit. Your program needs to use this unit to compile correctly.
: : : Hint: An unknown identifier always happens because of one of three reasons. Here they are with their solutions:
: : : - The unit which holds the identifier is not in the uses list. Solution: add the unit to the uses list.
: : : - A typing error was made in the identifier. Solution: correct the error.
: : : - The identifier is truly unknown. Solution: declare the identifier before the line in which it is used.
: : :
: :
: :
: :
: :
: :
: :
: : Hai,
: : Thanx for ur reply. But I have added uses Crt in the program
: :
: : (ie)
: : program test(input,output);
: : uses Crt;
: : begin
: : clrscr;
: : writeln;
: : Writeln('Hello');
: : Readln;
: : end.
: :
: :
: : But its giving a runtime error as Division by zero for this. Plz help me as Iam desperate.
: :
: :
: :
: :
: Under several newer windows versions the crt gives that error. There are several patches on the internet. You can find them using google with "turbo pascal crt patch" search string.
: If you don't want to patch your crt, you can always writeln() 25 empty lines onto your screen.
:

Hai
thanx for ur reply yaa. But its giving some error message if i give
writeln() 25
Can u tell me the exact syntax for this plz
thanx

Re: doubt in clrscr

Mon, 07 Apr 2003 22:08:35 -0700

: : : : : Hai friends,
: : : : : Iam using Turbo Pascal 7.0.
: : : : :
: : : : : In this simple program:
: : : : :
: : : : : program test(input,output);
: : : : : begin
: : : : : clrscr;
: : : : : writeln;
: : : : : Writeln('Hello');
: : : : : Readln;
: : : : : end.
: : : : :
: : : : : Here, in this program in line 3 (ie) clrscr;
: : : : :
: : : : : Its giving an error saying unknown identifier.
: : : : :
: : : : : I want to clear the screen and show the output.
: : : : :
: : : : : Kindly advice me as regards this.
: : : : :
: : : : : Regards
: : : : : Uma.
: : : : :
: : : : If you look at the help file page on the clrscr procedure, you will see that it is located in the Crt or WinCrt unit. Your program needs to use this unit to compile correctly.
: : : : Hint: An unknown identifier always happens because of one of three reasons. Here they are with their solutions:
: : : : - The unit which holds the identifier is not in the uses list. Solution: add the unit to the uses list.
: : : : - A typing error was made in the identifier. Solution: correct the error.
: : : : - The identifier is truly unknown. Solution: declare the identifier before the line in which it is used.
: : : :
: : :
: : :
: : :
: : :
: : :
: : :
: : : Hai,
: : : Thanx for ur reply. But I have added uses Crt in the program
: : :
: : : (ie)
: : : program test(input,output);
: : : uses Crt;
: : : begin
: : : clrscr;
: : : writeln;
: : : Writeln('Hello');
: : : Readln;
: : : end.
: : :
: : :
: : : But its giving a runtime error as Division by zero for this. Plz help me as Iam desperate.
: : :
: : :
: : :
: : :
: : Under several newer windows versions the crt gives that error. There are several patches on the internet. You can find them using google with "turbo pascal crt patch" search string.
: : If you don't want to patch your crt, you can always writeln() 25 empty lines onto your screen.
: :
:
:
:
:
: Hai
: thanx for ur reply yaa. But its giving some error message if i give
: writeln() 25
: Can u tell me the exact syntax for this plz
: thanx
:
:
:

  for i := 1 to 25 do
    writeln;

Re: doubt in clrscr

Tue, 08 Apr 2003 06:11:33 -0700

program test;

uses crt;

var i: integer
begin
  for i := 1 to 25 do
    writeln;
end.

That code will still give you the runtime error. You didnt call ClrScr() or any other function from the Crt unit, but it'll happen anyway.

The best solution is to search for the patch as zibadian suggested. There may come a time when you cant use a workaround like using WriteLn 25 times, so you'll need it then anyway.

Re: doubt in clrscr

Thu, 24 Apr 2003 17:30:01 -0700

you can as well try to set the mode again.
as side effect the screen will be cleared.

function set_text_mode;assembler;
asm
  mov ax,3
  int 16
end;

the downside is, it is not all that fast plus
if you are running in a dos-box, it will maximize
window.