Printf %d and %ld

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  • =?Utf-8?B?R2Vvcmdl?=
    #1

    Printf %d and %ld

    Hello everyone,


    I think printf %d works fine with signed, unsigned and negative integer
    values, and the same as %ld for long. Is that correct? If not, do we need to
    special conversion?


    thanks in advance,
    George
    Tags: None
    • David Wilkinson
      #2
      Re: Printf %d and %ld

      George wrote:
      Hello everyone,
      >
      >
      I think printf %d works fine with signed, unsigned and negative integer
      values, and the same as %ld for long. Is that correct? If not, do we need to
      special conversion?
      George:

      %d will only work for unsigned int if the value is not bigger than the
      largest allowed value of int. Otherwise, a negative value will be displayed.

      --
      David Wilkinson
      Visual C++ MVP

        Comment

        • =?Utf-8?B?R2Vvcmdl?=
          #3
          Re: Printf %d and %ld

          Hi David,


          Only works for unsigned int? I have tried that -1 works. :-)

          int i = -1;
          printf ("i is: %d", -1);

          I have tried it on Visual Studio 2005.


          regards,
          George

          "David Wilkinson" wrote:
          George wrote:
          Hello everyone,


          I think printf %d works fine with signed, unsigned and negative integer
          values, and the same as %ld for long. Is that correct? If not, do we need to
          special conversion?
          >
          George:
          >
          %d will only work for unsigned int if the value is not bigger than the
          largest allowed value of int. Otherwise, a negative value will be displayed.
          >
          --
          David Wilkinson
          Visual C++ MVP
          >

            Comment

            • David Wilkinson
              #4
              Re: Printf %d and %ld

              George wrote:
              Hi David,
              >
              >
              Only works for unsigned int? I have tried that -1 works. :-)
              >
              int i = -1;
              printf ("i is: %d", -1);
              >
              I have tried it on Visual Studio 2005.
              >
              >
              regards,
              George
              >
              "David Wilkinson" wrote:
              >%d will only work for unsigned int if the value is not bigger than the
              >largest allowed value of int. Otherwise, a negative value will be displayed.
              >>
              >--
              >David Wilkinson
              >Visual C++ MVP
              George:

              I meant:

              For unsigned int, %d will only work if the value is not bigger than the
              largest allowed value of int. Otherwise, a negative value will be
              displayed. %u should be used with unsigned int.

              %d is intended for use with int, and either positive or negative values
              may be displayed.

              Although not so well suited to localization, C++ streams handle this
              issue much better, because they are overloaded for different types.

              --
              David Wilkinson
              Visual C++ MVP

                Comment

                • =?Utf-8?B?R2Vvcmdl?=
                  #5
                  Re: Printf %d and %ld

                  Thanks David,


                  I agree.


                  regards,
                  George

                  "David Wilkinson" wrote:
                  George wrote:
                  Hi David,


                  Only works for unsigned int? I have tried that -1 works. :-)

                  int i = -1;
                  printf ("i is: %d", -1);

                  I have tried it on Visual Studio 2005.


                  regards,
                  George

                  "David Wilkinson" wrote:
                  %d will only work for unsigned int if the value is not bigger than the
                  largest allowed value of int. Otherwise, a negative value will be displayed.
                  >
                  --
                  David Wilkinson
                  Visual C++ MVP
                  >
                  George:
                  >
                  I meant:
                  >
                  For unsigned int, %d will only work if the value is not bigger than the
                  largest allowed value of int. Otherwise, a negative value will be
                  displayed. %u should be used with unsigned int.
                  >
                  %d is intended for use with int, and either positive or negative values
                  may be displayed.
                  >
                  Although not so well suited to localization, C++ streams handle this
                  issue much better, because they are overloaded for different types.
                  >
                  --
                  David Wilkinson
                  Visual C++ MVP
                  >

                    Comment

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