Thread: unsigned long long to string conversion

  1. #1
    Registered User
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    Nov 2005

    unsigned long long to string conversion


    in c there is a way of getting a unsigned long long into a char array by using sprintf, is there a method in c++ that gets an ull into a string?


  2. #2
    Kernel hacker
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    Jul 2007
    Farncombe, Surrey, England
    stringstream - but I thought you weren't supposed to use C++?

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  3. #3
    Registered User
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    Nov 2005
    how do u use it?

    unsigned long long input;
    stringstream ss;
    string s;
    s << input;

  4. #4
    C++ Witch laserlight's Avatar
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    Oct 2003
    unsigned long long input = 1234ULL;
    stringstream ss;
    string s;
    ss << input;
    ss >> s; // or s = ss.str();
    Oops, unsigned long long, not unsigned long. Note that (signed/unsigned) long long is non-standard in C++ though available as an extension on some compilers.
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  5. #5
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    Dec 2006
    and __int64 on some others.

  6. #6
    and the hat of int overfl Salem's Avatar
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    Aug 2001
    The edge of the known universe
    > in c there is a way of getting a unsigned long long into a char array by using sprintf,
    Yes there is, but the conversion format still depends on your OS/Compiler (until everyone supports C99 properly).
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  7. #7
    Join Date
    Oct 2007
    Quote Originally Posted by cyberfish View Post
    and __int64 on some others.
    I assume unsigned long long would be unsigned __int64.
    I typically just use the macros from the headers, UINT64 or INT64.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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