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Sep 24th, 2004
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Prog to list ASCII codes (beginners' stuff)

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Hi,

I just started a program containing every single prog we have done for school so far and added some private stuff.
Searching through my older files I found a prog which lists all Integers between 1 and 255 and their respective ASCII char, so I decided to include it into my 'collection'.

The problem is that 'twas a Win32 executable and we're working under DOS. Well actually this wouldn't be much of a problem, but the script seems no to work under DOS.

Well, first of here's the script:
  1.   	# include <iostream.h>
  2.    # include <conio.h>
  3.  
  4.    main()
  5.    {
  6.       int i, j, ip, ipp;
  7.       float k, l;
  8.       char zeichen;
  9.       for (i=1;i<=254;i++)
  10.       {
  11.           zeichen=i;
  12.           cout<<"\n"<<i<<" - "<<zeichen;
  13.           j=1;
  14.           for (j=1;j<=25;j++)
  15.           {
  16.                k=1.0*i/20;
  17.                l=1.0*j;
  18.                if (k==l)
  19.                {
  20.                     ip=i+1;
  21.                     ipp=i+20;
  22.                     if (i<=240) cout<<"\n\n(Press any key -->  "<<ip<<" to "<<ipp<<" )";
  23.                     getch();
  24.                     clrscr();
  25.                };
  26.            }
  27.         }
  28.         getch();
  29.    }

As I stated, no problems under Win32, but under DOS it stops at 26 and after pressing a key again the screen gets cleared again and stays black.

So my question is..is there any way to get something like this running under DOS?

I tried a simple "cin>>intvar; charvar=intvar; cout<<charvar;" aswell, but any value above 25 simply results in nothing being put out.

Well, thanks in advance.~
Anu
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Sep 24th, 2004
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Re: Prog to list ASCII codes (beginners' stuff)

Skip 26. Or better yet, skip printing everything non-printable.
  1.  #include <stdio.h>
  2.  #include <ctype.h>
  3.  
  4.  int main(void)
  5.  {
  6.     int i;
  7.     for ( i = 0; i < 256; ++i )
  8.     {
  9.  	  putchar(isprint(i) ? i : '.');
  10.  	  putchar(i % 16 == 15 ? '\n' : ' ');
  11.     }
  12.     return 0;
  13.  }
  14.  
  15.  /* my output
  16.  . . . . . . . . . . . . . . . .
  17.  . . . . . . . . . . . . . . . .
  18.    ! " # $ % & ' ( ) * + , - . /
  19.  0 1 2 3 4 5 6 7 8 9 : ; < = > ?
  20.  @ A B C D E F G H I J K L M N O
  21.  P Q R S T U V W X Y Z [ \ ] ^ _
  22.  ` a b c d e f g h i j k l m n o
  23.  p q r s t u v w x y z { | } ~ .
  24.  . . . . . . . . . . . . . . . .
  25.  . . . . . . . . . . . . . . . .
  26.  . . . . . . . . . . . . . . . .
  27.  . . . . . . . . . . . . . . . .
  28.  . . . . . . . . . . . . . . . .
  29.  . . . . . . . . . . . . . . . .
  30.  . . . . . . . . . . . . . . . .
  31.  . . . . . . . . . . . . . . . .
  32.  */
Last edited by Dave Sinkula; Sep 24th, 2004 at 6:45 pm. Reason: Added code.
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Sep 24th, 2004
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Re: Prog to list ASCII codes (beginners' stuff)

Quote originally posted by Dave Sinkula ...
Skip 26. Or better yet, skip printing everything non-printable.
Wow, thanks for the fast reply.

Well, but how to skip them most easily?

The first and more or less only thing that comes into my mind is like:

if ( i != 26 && i != anotherone && i != yetanotherone &&...
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Sep 24th, 2004
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Re: Prog to list ASCII codes (beginners' stuff)

[Oops. I see your reply beat my edit.]

I'd use isprint.

  1. #include <stdio.h>
  2.  #include <ctype.h>
  3.  
  4.  int main(void)
  5.  {
  6.     int i;
  7.     for ( i = 0; i < 128; ++i )
  8.     {
  9.  	  putchar(isprint(i) ? i : '.');
  10.  	  putchar(i % 32 == 31 ? '\n' : ' ');
  11.     }
  12.     return 0;
  13.  }
  14.  
  15.  /* my output
  16.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
  17.    ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ?
  18.  @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _
  19.  ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~ .
  20.  */
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Sep 24th, 2004
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Re: Prog to list ASCII codes (beginners' stuff)

I see, thanks again.

But seeing this...

The output under Win32 is like:
  1. 1   - ☺ 
  2. 2   - ☻ 
  3. 3   - ♥ 
  4. 4   - ♦
  5. 5   - ♣
  6. 6   - ♠
  7. 7   -
  8. 8   -
  9. 9   -
  10. 10  -
  11. 11  - ♂
  12. 12  - ♀
  13. 13  - 
  14. 14  - ♫
  15. 15  - ☼ 
  16. 16  - ► 
  17. 17  - ◄ 
  18. 18  - ↕
  19. 19  - ‼
  20. 20  - ¶
  21. 21  - §
And so on, so...

Aint I able to display the 255 ones of those under Dos?
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Sep 24th, 2004
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Re: Prog to list ASCII codes (beginners' stuff)

Check out http://www.asciitable.com/

The full list of ASCII characters are there. The function isprint() knows which of the characters are printable. isprint() returns a nonzero value if the input is a printable character, including the space character (0x20 – 0x7E). The other characters are either extended, or do other features which aren't print friendly.

More information on isprint()
isprint() is included in the ctype library, ctype.h:

int isprint(int c);
» This function returns nonzero if c is a space or a character for which either isalnum() or ispunct() returns nonzero.

int isalnum(int c);
» This function returns nonzero if c is any of or other locale-specific alphabetic character.
According to AsciiTable.com
Characters	ASCII
a thru z	97 thru 122
A thru Z	65 thru 90
0 thru 9	48 thru 57
int ispunct(int c);
» This function returns nonzero if c is any of the following or other implementation-defined punctuation character:
According to AsciiTable.com
Characters			ASCII
! " # $ % & ' ( ) * + , - . /	33 thru 47
: ; < = > ? @			58 thru 64
[ \ ] ^ _ '			91 thru 96
{ | } ~				123 thru 126

Hope this helps,
- Stack Overflow
Last edited by Stack Overflow; Sep 24th, 2004 at 8:15 pm. Reason: More detailed information
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Sep 24th, 2004
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Re: Prog to list ASCII codes (beginners' stuff)

Thanks, might be quite of use, though probably not directly in what I'm thinking of.

See the attachments, I just want the fourth attachment (Dos, page2) to be like the second one (W32, page2).
Attached Thumbnails
Click image for larger version Name: w32a.JPG Views: 272 Size: 8.5 KB ID: 621   Click image for larger version Name: w32b.JPG Views: 279 Size: 10.2 KB ID: 622   Click image for larger version Name: dosa.JPG Views: 278 Size: 10.7 KB ID: 623   Click image for larger version Name: dosb.JPG Views: 276 Size: 4.3 KB ID: 624  
Anu
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Re: Prog to list ASCII codes (beginners' stuff)

Quote originally posted by Stack Overflow ...
Check out http://www.asciitable.com/

The full list of ASCII characters are there. The function isprint() knows which of the characters are printable. isprint() returns a nonzero value if the input is a printable character, including the space character (0x20 – 0x7E). The other characters are either extended, or do other features which aren't print friendly.

More information on isprint()
isprint() is included in the ctype library, ctype.h:

int isprint(int c);
» This function returns nonzero if c is a space or a character for which either isalnum() or ispunct() returns nonzero.

int isalnum(int c);
» This function returns nonzero if c is any of or other locale-specific alphabetic character.
According to AsciiTable.com
 Characters	ASCII
 a thru z	97 thru 122
 A thru Z	65 thru 90
 0 thru 9	48 thru 57
int ispunct(int c);
» This function returns nonzero if c is any of the following or other implementation-defined punctuation character:
According to AsciiTable.com
 Characters			ASCII
 ! " # $ % & ' ( ) * + , - . /	33 thru 47
 : ; < = > ? @			58 thru 64
 [ \ ] ^ _ '			91 thru 96
 { | } ~				123 thru 126

Hope this helps,
- Stack Overflow
The greater utility of functions like ispunct and isalnum are that they also work with other character sets, some of which, for example, do not necessarily have a contiguous alphabet or such. They are designed to work regardless of the particular implementation.
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Re: Prog to list ASCII codes (beginners' stuff)

Quote originally posted by Anu ...
See the attachments, I just want the fourth attachment (Dos, page2) to be like the second one (W32, page2).
DOS has a particular issue with the value 26. Apparently it is an end-of-file marker. So on a DOS system, it will not work the way you'd like. Thus my recommendation to skip it.
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Sep 25th, 2004
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Re: Prog to list ASCII codes (beginners' stuff)

That was all I actually wanted to know. Thanks once again. ^^
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This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.
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