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Re: Using cout to print hex values; surely you can't be serious

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On 02/ 9/12 07:41 PM, Paavo Helde wrote:
> Chris Stankevitz<chrisstankevitz@gmail.com>  wrote in news:08081227-b09b-
> 454f-b23d-85ebb98207c0@n12g2000yqb.googlegroups.com:
>
>> char c = 0xFF;
>>
>> Q1: How do I use cout to print the variable c so that it appears at
>> stdout as "FF"?
>
> char buff[3];
> sprintf(buff, "%02X", c);
> std::cout<<  buff;
>
> If you are afraid that char is 32 or 64 bits on some platform and might not
> fit into the buffer, you can make the buffer e.g. 17 bytes long as a
> precaution.

The buffer is an array of char, so it will always be big enough no 
matter how big a char is (in c++ terms it is always 1).

> The point is that the dreaded buffer overflows associated with
> sprintf() can be avoided here easily as the output size is constrained, so
> there is no reason why sprintf() could not be used if it suits the task
> better.

Completely agree.

-- 
Ian Collins

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Thread

Using cout to print hex values; surely you can't be serious Chris Stankevitz <chrisstankevitz@gmail.com> - 2012-02-07 21:16 -0800
  Re: Using cout to print hex values; surely you can't be serious gwowen <gwowen@gmail.com> - 2012-02-08 03:54 -0800
  Re: Using cout to print hex values; surely you can't be serious Victor Bazarov <v.bazarov@comcast.invalid> - 2012-02-08 08:15 -0500
    Re: Using cout to print hex values; surely you can't be serious gwowen <gwowen@gmail.com> - 2012-02-08 06:49 -0800
      Re: Using cout to print hex values; surely you can't be serious "io_x" <a@b.c.invalid> - 2012-02-19 18:24 +0100
        Re: Using cout to print hex values; surely you can't be serious 88888 Dihedral <dihedral88888@googlemail.com> - 2012-02-20 03:19 -0800
          Re: Using cout to print hex values; surely you can't be serious 88888 Dihedral <dihedral88888@googlemail.com> - 2012-02-21 03:08 -0800
    Re: Using cout to print hex values; surely you can't be serious Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-02-08 15:20 +0000
  Re: Using cout to print hex values; surely you can't be serious Leigh Johnston <leigh@i42.co.uk> - 2012-02-08 14:20 +0000
  Re: Using cout to print hex values; surely you can't be serious Paavo Helde <myfirstname@osa.pri.ee> - 2012-02-09 00:41 -0600
    Re: Using cout to print hex values; surely you can't be serious Ian Collins <ian-news@hotmail.com> - 2012-02-09 20:22 +1300
      Re: Using cout to print hex values; surely you can't be serious gwowen <gwowen@gmail.com> - 2012-02-09 00:16 -0800
        Re: Using cout to print hex values; surely you can't be serious Ian Collins <ian-news@hotmail.com> - 2012-02-09 21:44 +1300
          Re: Using cout to print hex values; surely you can't be serious Juha Nieminen <nospam@thanks.invalid> - 2012-02-09 10:36 +0000
          Re: Using cout to print hex values; surely you can't be serious gwowen <gwowen@gmail.com> - 2012-02-09 03:56 -0800
            Re: Using cout to print hex values; surely you can't be serious scott@slp53.sl.home (Scott Lurndal) - 2012-02-09 17:06 +0000
              Re: Using cout to print hex values; surely you can't be serious Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-02-12 15:59 +0000
    Re: Using cout to print hex values; surely you can't be serious scott@slp53.sl.home (Scott Lurndal) - 2012-02-09 17:04 +0000

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