Solved

the format specifier for sprintf

Posted on 2001-08-27
24
1,481 Views
Last Modified: 2013-11-20
I'm using sprintf(string,"%x",number) on a string to be displayed by a CStatic control.

where number is an int

can i display it in binary format? I don't find any binary specifier in the help ( i remember in Turbo C i have a %b specifier---something like that)

i mean i want to display a 2 as 10 in binary format, but not hexadecimal, octal or anythig else
0
Comment
Question by:orange_juice
  • 11
  • 6
  • 3
  • +3
24 Comments
 
LVL 31

Accepted Solution

by:
Zoppo earned 50 total points
ID: 6428699
Hi orange_juice,

for this you can use _itop function with argument 'radix' = 2,

hope that helps,

ZOPPO
0
 

Expert Comment

by:Kevin_Elrod
ID: 6429039
Convert the number to binary before you put it in the string.  That should be easier!
0
 
LVL 4

Expert Comment

by:jtwine100697
ID: 6429179
> for this you can use _itop function with argument 'radix' = 2,

I think that was supposed to be "_itoa". :)

> Convert the number to binary before you put it in the string.

Gonna love to hear the details on that one! :)

-=- James.
0
 
LVL 6

Expert Comment

by:Triskelion
ID: 6430480
Here is a sample copied directly from the MS 16-bit compuler help file.  As 'Zoppo' meant and as 'jtwine' corrected, use _itoa():

/* ITOA.C: This program converts integers of various
 * sizes to strings in various radixes.
 */
#include <stdlib.h>
#include <stdio.h>
void main( void )
{
   char buffer[20];
   int  i = 3445;
   long l = -344115L;
   unsigned long ul = 1234567890UL;
   _itoa( i, buffer, 10 );
   printf( "String of integer %d (radix 10): %s\n", i, buffer );
   _itoa( i, buffer, 16 );
   printf( "String of integer %d (radix 16): 0x%s\n", i, buffer );
   _itoa( i, buffer, 2  );
   printf( "String of integer %d (radix 2): %s\n", i, buffer );
   _ltoa( l, buffer, 16 );
   printf( "String of long int %ld (radix 16): 0x%s\n", l, buffer );
   _ultoa( ul, buffer, 16 );
   printf( "String of unsigned long %lu (radix 16): 0x%s\n", ul, buffer );
}
0
 
LVL 31

Expert Comment

by:Zoppo
ID: 6431384
yes, sorry, a typo...

BTW, Kevin_Elrod, what exactly do you mean with 'Convert the number to binary before you put it in the string.'?
0
 

Expert Comment

by:Kevin_Elrod
ID: 6432389
I must be way off, given the comments I've generated, but
what about this

str mybinary("01000010");


0
 
LVL 31

Expert Comment

by:Zoppo
ID: 6432420
Kevin_Elrod, what should 'str' be? And what should it help to hardcode a string
which contains a binary number?
0
 

Expert Comment

by:Kevin_Elrod
ID: 6432504
Okay, I spoke too soon.
0
 

Expert Comment

by:Kevin_Elrod
ID: 6432505
Okay, I spoke too soon.
0
 

Expert Comment

by:Kevin_Elrod
ID: 6432507
Okay, I spoke too soon.
0
 

Expert Comment

by:Kevin_Elrod
ID: 6432508
Okay, I spoke too soon.
0
 

Expert Comment

by:Kevin_Elrod
ID: 6432510
Okay, I spoke too soon.
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 

Expert Comment

by:Kevin_Elrod
ID: 6432511
Okay, I spoke too soon.
0
 

Expert Comment

by:Kevin_Elrod
ID: 6432512
Okay, I spoke too soon.
0
 

Expert Comment

by:Kevin_Elrod
ID: 6432514
Okay, I spoke too soon.
0
 

Expert Comment

by:Kevin_Elrod
ID: 6432515
Okay, I spoke too soon.
0
 
LVL 31

Expert Comment

by:Zoppo
ID: 6432531
And, maybe, too often          ;-)
0
 
LVL 4

Expert Comment

by:jtwine100697
ID: 6432572
Bad Refresh, Bad!  Now go sit in the corner, you bad Refresh, you! :P

---

> And what should it help to hardcode a string which contains a binary number?

Many people do things that seem weird.  Maybe the OP has his/her reasons...

> str mybinary("01000010");

If "str" is some kind of string object, then you have a string that contains "01000010", but you would still need to get the value of 66 converted to "01000010".

Besides, OJ's question has already been answered: _itoa with a Radix of 2 will convert a integer value to a binary string suitable for display.

-=- James.
0
 
LVL 49

Expert Comment

by:DanRollins
ID: 6438697
A minor embellishement to the already complete answers...

It is common to need to display binary numbers in increments of eight digits.  If that is your need, try:

char buf[33]; // long enough for 32-bit number!
itoa( n, buf, 2 );

sprintf( str,"%08.8s", buf ) ; // eight bits
sprintf( str,"%016.16s", buf ) ; // sixteen bits
-=-=-=-=-=
or use this seldom-used idiom to set the width programmatically:

int nwidth= 8;
sprintf( str,"%0*.*s",nwidth,nwidth, buf ) ;

-- Dan
0
 
LVL 1

Author Comment

by:orange_juice
ID: 6449815
wow, there has been lots of answer
i have been outstation, so today only i read all
this
i appreaciate everybody's help
0
 
LVL 1

Author Comment

by:orange_juice
ID: 6450461
that does the job
  thank you to everybody too


how to retain those leading zeros when i use itoa
suppose i want a 000010 gets displayed instead of 10?

i think i should post this again

:)
0
 
LVL 31

Expert Comment

by:Zoppo
ID: 6450469
well, as DanRollins mentioned above you can use the string you get from _itoa to create
a result as you want with i.e. sprintf( str,"%08.8s", buf )...
0
 
LVL 31

Expert Comment

by:Zoppo
ID: 6450471
... for 8 digits ... for the 000010 which is only 6 digits you can then use sprintf( str,"%06.6s", buf )
0
 
LVL 1

Author Comment

by:orange_juice
ID: 6455286
thank you again

:)
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Here is how to use MFC's automatic Radio Button handling in your dialog boxes and forms.  Beginner programmers usually start with a OnClick handler for each radio button and that's just not the right way to go.  MFC has a very cool system for handli…
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Learn how to create flexible layouts using relative units in CSS.  New relative units added in CSS3 include vw(viewports width), vh(viewports height), vmin(minimum of viewports height and width), and vmax (maximum of viewports height and width).

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now