What is << ?

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  • mab464
    #1

    What is << ?

    I was taking an online PHP test and got the question

    What will the output of the following statement be

    echo 4<<5;

    After the test, I searched google but couldn't find any such
    operator/construct.
    Can any one explain what '<<' does?

    Thanks

    Tags: None
    • Jensen Somers
      #2
      Re: What is &lt;&lt; ?

      Hello,

      mab464 wrote:
      I was taking an online PHP test and got the question
      >
      What will the output of the following statement be
      >
      echo 4<<5;
      >
      After the test, I searched google but couldn't find any such
      operator/construct.
      Can any one explain what '<<' does?
      >
      Thanks
      That's a bitwise operation.

      You can find more information about bitwise operations at
      http://be.php.net/language.operators.bitwise.

      - Jensen

        Comment

        • sathyashrayan
          #3
          Re: What is &lt;&lt; ?


          "mab464" <mab464@gmail.c omwrote in message
          news:g5f5bn$uba $1@registered.m otzarella.org.. .
          >I was taking an online PHP test and got the question
          >
          What will the output of the following statement be
          >
          echo 4<<5;
          >
          After the test, I searched google but couldn't find any such
          operator/construct.
          Can any one explain what '<<' does?
          >
          Thanks
          search for "computer number system" in google, then search for base 2
          numbers.Then come to bit operators.


            Comment

            • D. Stussy
              #4
              Re: What is &lt;&lt; ?

              "mab464" <mab464@gmail.c omwrote in message
              news:g5f5bn$uba $1@registered.m otzarella.org.. .
              I was taking an online PHP test and got the question
              >
              What will the output of the following statement be
              >
              echo 4<<5;
              >
              After the test, I searched google but couldn't find any such
              operator/construct.
              Can any one explain what '<<' does?
              128.


                Comment

                • The Natural Philosopher
                  #5
                  Re: What is &lt;&lt; ?

                  D. Stussy wrote:
                  "mab464" <mab464@gmail.c omwrote in message
                  news:g5f5bn$uba $1@registered.m otzarella.org.. .
                  >I was taking an online PHP test and got the question
                  >>
                  >What will the output of the following statement be
                  >>
                  >echo 4<<5;
                  >>
                  >After the test, I searched google but couldn't find any such
                  >operator/construct.
                  >Can any one explain what '<<' does?
                  >
                  128.
                  >
                  >
                  42

                    Comment

                    • D. Stussy
                      #6
                      Re: What is &lt;&lt; ?

                      "The Natural Philosopher" <a@b.cwrote in message
                      news:1216245635 .2284.1@proxy00 .news.clara.net ...
                      D. Stussy wrote:
                      "mab464" <mab464@gmail.c omwrote in message
                      news:g5f5bn$uba $1@registered.m otzarella.org.. .
                      I was taking an online PHP test and got the question
                      >
                      What will the output of the following statement be
                      >
                      echo 4<<5;
                      >
                      After the test, I searched google but couldn't find any such
                      operator/construct.
                      Can any one explain what '<<' does?
                      128.
                      >
                      42
                      Wrong. Not possible. To get 42, one would have to use "base 31.5," but
                      half a digit isn't possible, nor does it make sense.


                        Comment

                        • Twayne
                          #7
                          Re: What is &lt;&lt; ?

                          "The Natural Philosopher" <a@b.cwrote in message
                          news:1216245635 .2284.1@proxy00 .news.clara.net ...
                          >D. Stussy wrote:
                          >>"mab464" <mab464@gmail.c omwrote in message
                          >>news:g5f5bn$u ba$1@registered .motzarella.org ...
                          >>>I was taking an online PHP test and got the question
                          >>>>
                          >>>What will the output of the following statement be
                          >>>>
                          >>>echo 4<<5;
                          >>>>
                          >>>After the test, I searched google but couldn't find any such
                          >>>operator/construct.
                          >>>Can any one explain what '<<' does?
                          >>>
                          >>128.
                          >>
                          >42
                          >
                          Wrong. Not possible. To get 42, one would have to use "base 31.5,"
                          but half a digit isn't possible, nor does it make sense.
                          Not impossible, just improbable. If one wants the answer to the meaning
                          of life, that's the sort of work one must go thru. <g>


                            Comment

                            • Jerry Stuckle
                              #8
                              Re: What is &lt;&lt; ?

                              D. Stussy wrote:
                              "The Natural Philosopher" <a@b.cwrote in message
                              news:1216245635 .2284.1@proxy00 .news.clara.net ...
                              >D. Stussy wrote:
                              >>"mab464" <mab464@gmail.c omwrote in message
                              >>news:g5f5bn$u ba$1@registered .motzarella.org ...
                              >>>I was taking an online PHP test and got the question
                              >>>>
                              >>>What will the output of the following statement be
                              >>>>
                              >>>echo 4<<5;
                              >>>>
                              >>>After the test, I searched google but couldn't find any such
                              >>>operator/construct.
                              >>>Can any one explain what '<<' does?
                              >>128.
                              >42
                              >
                              Wrong. Not possible. To get 42, one would have to use "base 31.5," but
                              half a digit isn't possible, nor does it make sense.
                              >
                              >
                              >
                              Whoosh!

                              (That's the sound of a joke going right over your head) :-)

                              --
                              =============== ===
                              Remove the "x" from my email address
                              Jerry Stuckle
                              JDS Computer Training Corp.
                              jstucklex@attgl obal.net
                              =============== ===

                                Comment

                                • The Natural Philosopher
                                  #9
                                  Re: What is &lt;&lt; ?

                                  D. Stussy wrote:
                                  "The Natural Philosopher" <a@b.cwrote in message
                                  news:1216245635 .2284.1@proxy00 .news.clara.net ...
                                  >D. Stussy wrote:
                                  >>"mab464" <mab464@gmail.c omwrote in message
                                  >>news:g5f5bn$u ba$1@registered .motzarella.org ...
                                  >>>I was taking an online PHP test and got the question
                                  >>>>
                                  >>>What will the output of the following statement be
                                  >>>>
                                  >>>echo 4<<5;
                                  >>>>
                                  >>>After the test, I searched google but couldn't find any such
                                  >>>operator/construct.
                                  >>>Can any one explain what '<<' does?
                                  >>128.
                                  >42
                                  >
                                  Wrong. Not possible. To get 42, one would have to use "base 31.5," but
                                  half a digit isn't possible, nor does it make sense.
                                  >
                                  >
                                  I am impressed that you even tried to make sense of it.

                                    Comment

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