Hex n' junk

This is a discussion on Hex n' junk within the C++ Programming forums, part of the General Programming Boards category; What's locale loc; for? Can't you just do ... Code: #include <iostream> #include <string> using namespace std; int main() { ...

  1. #16
    The superhaterodyne twomers's Avatar
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    What's

    locale loc;

    for? Can't you just do ...

    Code:
    #include <iostream>
    #include <string>
    
    using namespace std;
    
    int main()
    {
    	string thing = "asdf";
    
    	cout<< endl << thing;
    	for ( int i=0; i<4; i++ )
    	{
    		thing[i] = toupper( (int) thing[i] );
    	}
    	cout<< endl << thing;
    
    	return 0;
    }

  2. #17
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    Out of the two methods, only twormers worked.
    But that one only converts the first letter.

    How can I convert them all ?

    (Sorry if i'm bieng stupid here, and have missed something obvious.)

  3. #18
    The Richness... Richie T's Avatar
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    Converts all the letters when I run it...

    [update]
    That locale loc seems very wrong - toupper takes only 1 argument
    [/update]
    Last edited by Richie T; 05-19-2006 at 10:39 AM.
    No No's:
    fflush (stdin); gets (); void main ();


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  4. #19
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    Just incase this makes a difference, there are some numbers in between the letters I wish to convert.

    Dunno if this matters or not.

  5. #20
    The Richness... Richie T's Avatar
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    No it shouldn't matter - you can test this in twomers program
    by replacing the "asdf" with "1234" - output is unchanged for
    numbers.
    No No's:
    fflush (stdin); gets (); void main ();


    Goodies:
    Example of fgets (); The FAQ, C/C++ Reference


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  6. #21
    C++ Witch laserlight's Avatar
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    I think you can just use std::transform() here:
    Code:
    #include <algorithm> // for std::transform
    #include <string>    // for std::string
    #include <cctype>    // for toupper
    #include <iostream>  // for std::cout and std::endl
    
    int main()
    {
    	std::string str = "asdf123";
    	std::cout << str << std::endl;
    
    	std::transform(str.begin(), str.end(), str.begin(), toupper);
    	std::cout << str << std::endl;
    }
    Last edited by laserlight; 05-19-2006 at 11:16 AM.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  7. #22
    Just Lurking Dave_Sinkula's Avatar
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    Quote Originally Posted by laserlight
    I think you can just use std::transform() here:
    It's been a while since I googled this one, but I seem to remember some kind of issues with that.
    http://groups.google.com/group/comp....f0e60773407338
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

  8. #23
    C++ Witch laserlight's Avatar
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    It's been a while since I googled this one, but I seem to remember some kind of issues with that.
    Yep, on a hunch that there might be a problem I tested with both the MinGW port of GCC and MSVC8. std::toupper gave no compilation problems with MSVC8, but choked on GCC. The old C toupper worked in both cases.

    I did a check in Josuttis' The C++ Standard Library, and his example (chapter 11, section 2.13) was the same as my modified version, with the condition that the global locale is used.
    Last edited by laserlight; 05-19-2006 at 11:29 AM.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  9. #24
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    How come transform only works if your'e not using namespace std ?

  10. #25
    C++ Witch laserlight's Avatar
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    How come transform only works if your'e not using namespace std ?
    My guess would be that the using declaration brings std::toupper into scope, so you then face the same problem as I did with the MinGW port of GCC.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  11. #26
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    >Oh, but is there a way to do it in lower case.
    Are you wanting the hex output in lowercase? If yes, you can just leave out the uppercase flag:
    Code:
          ss << hex << static_cast<unsigned int> (my_string[i]);
    At any rate, std::transform and std::tolower are worth learning.

  12. #27
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    Yeah, the previously mentioned method worked.
    Cheers swoopy, owe you one.

  13. #28
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    Quote Originally Posted by Ancient Dragon
    >>would it help if I say they were all separated by a full stop
    nope -- I have no idea what a "full stop" is. They should be separated by spaces, tabe or CR/LF (Windows) or LF (*nix).
    You used 5 full stops in your post I think they're known as "periods" in the US.

  14. #29
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    Ah. Sorry I'm from England.

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