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A Simple C++ Question.

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  • M Maximilien

    You are trying to modify a const char array (pointer). This is not C++. if you were writing proper C++, you would not get those problems (or a lot less likely).

    std::string name = "some name";
    std::cout << name << std::endl;

    std::string name2 = "some name";
    std::cout << name2 << std::endl;

    name2[1] = 'a'; // need to check that the index is within the string size.
    std::cout << name2 << std::endl;

    Watched code never compiles.

    C Offline
    C Offline
    Chuck OToole
    wrote on last edited by
    #5

    Technically, to pick nits, it *is* C++ as C++ is a superset of C. What you are really saying is that it isn't "Object Oriented Programming" which is true, but it is still within the definition of C++.

    J A 2 Replies Last reply
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    • M Maximilien

      You are trying to modify a const char array (pointer). This is not C++. if you were writing proper C++, you would not get those problems (or a lot less likely).

      std::string name = "some name";
      std::cout << name << std::endl;

      std::string name2 = "some name";
      std::cout << name2 << std::endl;

      name2[1] = 'a'; // need to check that the index is within the string size.
      std::cout << name2 << std::endl;

      Watched code never compiles.

      A Offline
      A Offline
      Albert Holguin
      wrote on last edited by
      #6

      Agree with Chuck... technically it is C++.

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      • C Chuck OToole

        Technically, to pick nits, it *is* C++ as C++ is a superset of C. What you are really saying is that it isn't "Object Oriented Programming" which is true, but it is still within the definition of C++.

        J Offline
        J Offline
        jschell
        wrote on last edited by
        #7

        Chuck O'Toole wrote:

        Technically, to pick nits, it *is* C++ as C++ is a superset of C

        Does the newest ANSI C++ standard incorporate the latest ANSI C standard as a subset? Last I heard that was not the case

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        • C Chuck OToole

          Technically, to pick nits, it *is* C++ as C++ is a superset of C. What you are really saying is that it isn't "Object Oriented Programming" which is true, but it is still within the definition of C++.

          A Offline
          A Offline
          Aescleal
          wrote on last edited by
          #8

          C++98 is not a superset of C90 - especially when you consider const and what happens when you cast away const. C allows modification of literals (string and constants) through pointers while C++ doesn't or rather considers it undefined behaviour.

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          • J jschell

            Chuck O'Toole wrote:

            Technically, to pick nits, it *is* C++ as C++ is a superset of C

            Does the newest ANSI C++ standard incorporate the latest ANSI C standard as a subset? Last I heard that was not the case

            C Offline
            C Offline
            Chuck OToole
            wrote on last edited by
            #9

            The point is, C++ did *not* decommit the "char" data type nor pointers. std::string is *not* the only way to do string manipulation in C++. It may be the perferred way for some people but it's not the only way.

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            • A Aescleal

              C++98 is not a superset of C90 - especially when you consider const and what happens when you cast away const. C allows modification of literals (string and constants) through pointers while C++ doesn't or rather considers it undefined behaviour.

              C Offline
              C Offline
              Chuck OToole
              wrote on last edited by
              #10

              The point is, C++ did *not* decommit the "char" data type nor pointers. std::string is *not* the only way to do string manipulation in C++. It may be the perferred way for some people but it's not the only way.

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              • C Chuck OToole

                The point is, C++ did *not* decommit the "char" data type nor pointers. std::string is *not* the only way to do string manipulation in C++. It may be the perferred way for some people but it's not the only way.

                J Offline
                J Offline
                jschell
                wrote on last edited by
                #11

                Chuck O'Toole wrote:

                The point is, C++ did *not* decommit the "char" data type nor pointer

                I was responding to what appeared to be a general comment about the language in general and in its entirety and not just one small part. And that general comment, at this time (new standards), is wrong.

                C 1 Reply Last reply
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                • J jschell

                  Chuck O'Toole wrote:

                  The point is, C++ did *not* decommit the "char" data type nor pointer

                  I was responding to what appeared to be a general comment about the language in general and in its entirety and not just one small part. And that general comment, at this time (new standards), is wrong.

                  C Offline
                  C Offline
                  Chuck OToole
                  wrote on last edited by
                  #12

                  Context dude, gotta read comments in the context of the thread

                  J 1 Reply Last reply
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                  • C Chuck OToole

                    Context dude, gotta read comments in the context of the thread

                    J Offline
                    J Offline
                    jschell
                    wrote on last edited by
                    #13

                    Chuck O'Toole wrote:

                    Context dude, gotta read comments in the context of the thread

                    And respond in that context. Since another poster read your response in way similar to the way I read it, it suggests that your response is the one at fault.

                    1 Reply Last reply
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                    • D David Crow

                      It all boils down to the difference between an array and a pointer. For name, you have set aside room for 20 characters (that are initialized to "Some Name"). For name2, you are pointing to a static piece of memory. That memory cannot be changed.

                      "One man's wage rise is another man's price increase." - Harold Wilson

                      "Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

                      "Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous

                      S Offline
                      S Offline
                      Sivaraman Dhamodharan
                      wrote on last edited by
                      #14

                      Thanks Crow. That is constant piece of memory.

                      Programming Article

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