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array of char*

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  • P piul

    Hi there! I need an array of strings of char * type and I am not clear about how to free up memory after use. The code below does not work.

    char \* ptr\_p\_c\[3\];
ptr\_p\_c\[0\] = new char;
strcpy (ptr\_p\_c\[0\], "hi there");
ptr\_p\_c\[1\] = new char;
strcpy (ptr\_p\_c\[1\], "whatever");

delete ptr\_p\_c;

    I know I shouldn't be using this type for strings and all this. Believe me, I've tried repeatedly to convince my customer this is not the right way to do things, but unfortunately it is not my decission... Thanks a lot.

    D Offline
    D Offline
    David Crow
    wrote on last edited by
    #7

    Does the memory for those strings necessarily need to come from the heap? If not, what about:

    char *ptr_p_c[] = { "hi there", "whatever" };

    "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

    "Man who follows car will be exhausted." - Confucius

    1 Reply Last reply
    0
    • P piul

      Hi there! I need an array of strings of char * type and I am not clear about how to free up memory after use. The code below does not work.

      char \* ptr\_p\_c\[3\];
ptr\_p\_c\[0\] = new char;
strcpy (ptr\_p\_c\[0\], "hi there");
ptr\_p\_c\[1\] = new char;
strcpy (ptr\_p\_c\[1\], "whatever");

delete ptr\_p\_c;

      I know I shouldn't be using this type for strings and all this. Believe me, I've tried repeatedly to convince my customer this is not the right way to do things, but unfortunately it is not my decission... Thanks a lot.

      M Offline
      M Offline
      Maximilien
      wrote on last edited by
      #8

      piul wrote:

      Believe me, I've tried repeatedly to convince my customer this is not the right way to do things, but unfortunately it is not my decission...

      If you are a professional, then MAKE IT your decision. if it takes less time to develop, less time to debug, make the code more secure and readable, than you need to do it the right way. anyway,you should delete each item in the ptr_p_c array. good luck.

      Watched code never compiles.

      1 Reply Last reply
      0
      • P piul

        Hi there! I need an array of strings of char * type and I am not clear about how to free up memory after use. The code below does not work.

        char \* ptr\_p\_c\[3\];
ptr\_p\_c\[0\] = new char;
strcpy (ptr\_p\_c\[0\], "hi there");
ptr\_p\_c\[1\] = new char;
strcpy (ptr\_p\_c\[1\], "whatever");

delete ptr\_p\_c;

        I know I shouldn't be using this type for strings and all this. Believe me, I've tried repeatedly to convince my customer this is not the right way to do things, but unfortunately it is not my decission... Thanks a lot.

        L Offline
        L Offline
        Lost User
        wrote on last edited by
        #9

        piul wrote:

        Believe me, I've tried repeatedly to convince my customer this is not the right way to do things

        Why does the customer need to know how you are implementing a small piece of code? If they understand that level of detail then why do they need you?

        Just say 'NO' to evaluated arguments for diadic functions! Ash

        CPalliniC 1 Reply Last reply
        0
        • P piul

          Hi there! I need an array of strings of char * type and I am not clear about how to free up memory after use. The code below does not work.

          char \* ptr\_p\_c\[3\];
ptr\_p\_c\[0\] = new char;
strcpy (ptr\_p\_c\[0\], "hi there");
ptr\_p\_c\[1\] = new char;
strcpy (ptr\_p\_c\[1\], "whatever");

delete ptr\_p\_c;

          I know I shouldn't be using this type for strings and all this. Believe me, I've tried repeatedly to convince my customer this is not the right way to do things, but unfortunately it is not my decission... Thanks a lot.

          _ Offline
          _ Offline
          _Superman_
          wrote on last edited by
          #10

          I know dumb customers. I also know dumber customers. But this is the dumbest customer.

          «_Superman_»  _I love work. It gives me something to do between weekends.

          _Microsoft MVP (Visual C++)

          Polymorphism in C

          CPalliniC L 2 Replies Last reply
          0
          • L Lost User

            piul wrote:

            Believe me, I've tried repeatedly to convince my customer this is not the right way to do things

            Why does the customer need to know how you are implementing a small piece of code? If they understand that level of detail then why do they need you?

            Just say 'NO' to evaluated arguments for diadic functions! Ash

            CPalliniC Offline
            CPalliniC Offline
            CPallini
            wrote on last edited by
            #11

            Because he's afraid of using new for instancing strings. :rolleyes:

            If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
            This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
            [My articles]

            In testa che avete, signor di Ceprano?

            1 Reply Last reply
            0
            • _ _Superman_

              I know dumb customers. I also know dumber customers. But this is the dumbest customer.

              «_Superman_»  _I love work. It gives me something to do between weekends.

              _Microsoft MVP (Visual C++)

              Polymorphism in C

              CPalliniC Offline
              CPalliniC Offline
              CPallini
              wrote on last edited by
              #12

              You know dumb customers. I know dumb customers. He knows dumb customers. Hey Superman, your customers. Hey Superman, YOUR customers are just not that dumb. :-D

              If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
              This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
              [My articles]

              In testa che avete, signor di Ceprano?

              1 Reply Last reply
              0
              • _ _Superman_

                I know dumb customers. I also know dumber customers. But this is the dumbest customer.

                «_Superman_»  _I love work. It gives me something to do between weekends.

                _Microsoft MVP (Visual C++)

                Polymorphism in C

                L Offline
                L Offline
                Lost User
                wrote on last edited by
                #13

                So dumb customers are your kryptonite, eh?

                ...byte till it megahertz... my donation to web rubbish

                _ 1 Reply Last reply
                0
                • L Lost User

                  So dumb customers are your kryptonite, eh?

                  ...byte till it megahertz... my donation to web rubbish

                  _ Offline
                  _ Offline
                  _Superman_
                  wrote on last edited by
                  #14

                  A good reason to dislike them. :)

                  «_Superman_»  _I love work. It gives me something to do between weekends.

                  _Microsoft MVP (Visual C++)

                  Polymorphism in C

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                  0
                  • CPalliniC CPallini

                    Well, you already know that avoiding std::string is just plain silly so I don't bother you more:

                    char * ptr_p_c[2];
                    ptr_p_c[0] = new char[sizeof("hi there")];
                    strcpy (ptr_p_c[0], "hi there");
                    ptr_p_c[1] = new char[sizeof("whatever")];
                    strcpy (ptr_p_c[1], "whatever");
                    delete ptr_p_c[0];
                    delete ptr_p_c[1];

                    If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                    This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
                    [My articles]

                    A Offline
                    A Offline
                    Alan Balkany
                    wrote on last edited by
                    #15

                    It looks like your sample is an example of why std:::string should be used: The null terminator will overflow the char[] buffers you allocated by one byte.

                    CPalliniC 1 Reply Last reply
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                    • A Alan Balkany

                      It looks like your sample is an example of why std:::string should be used: The null terminator will overflow the char[] buffers you allocated by one byte.

                      CPalliniC Offline
                      CPalliniC Offline
                      CPallini
                      wrote on last edited by
                      #16

                      You're wrong. Hint: I didn't use strlen. :)

                      If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                      This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
                      [My articles]

                      In testa che avete, signor di Ceprano?

                      A 1 Reply Last reply
                      0
                      • CPalliniC CPallini

                        You're wrong. Hint: I didn't use strlen. :)

                        If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
                        This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke
                        [My articles]

                        A Offline
                        A Offline
                        Alan Balkany
                        wrote on last edited by
                        #17

                        Oops, I stand corrected.

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