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Array Size

Scheduled Pinned Locked Moved C / C++ / MFC
helpc++data-structures
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  • L Lost User

    do you want the size of the array in bytes, or the number of elements in the array? if you want the size in bytes, use the sizeof() like so;

    int size_in_bytes;
    int theArray[20];
    size_in_bytes = sizeof(theArray);

    S Offline
    S Offline
    santhoshv84
    wrote on last edited by
    #7

    Hi, Dont use user defined array in this case. You better use CStringArray. Then you no need to calculate the size of the array. This class is having a member function int GetSize() to get the size of the array.

    The price of anything is the amount of life you exchange for it. Thanks and Regards. SANTHOSH V

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    • T TeVc

      Hi All I am new in vc++.I have a problem to get length of array.Plz help me

      K Offline
      K Offline
      KarstenK
      wrote on last edited by
      #8

      please read at first the docs about the used obejcts carefully. Often there are tiny little helper as .length or .GetLength to solve such problems. (And use the search box in top of this site a lot) :-\

      Greetings from Germany

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      • T TeVc

        Hi All I am new in vc++.I have a problem to get length of array.Plz help me

        CPalliniC Offline
        CPalliniC Offline
        CPallini
        wrote on last edited by
        #9

        What kind of array are you using? Could you please post array declaration? :)

        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?

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        0
        • CPalliniC CPallini

          What kind of array are you using? Could you please post array declaration? :)

          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]

          T Offline
          T Offline
          TeVc
          wrote on last edited by
          #10

          CString store[100];,

          CPalliniC 1 Reply Last reply
          0
          • T TeVc

            CString store[100];,

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

            The size of such array is

            int iSize = sizeof(store);

            The number of elements of such array is

            int iCount = sizeof(store)/sizeof(store[0]);

            or, more concisely, 100. :)

            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?

            T 1 Reply Last reply
            0
            • CPalliniC CPallini

              The size of such array is

              int iSize = sizeof(store);

              The number of elements of such array is

              int iCount = sizeof(store)/sizeof(store[0]);

              or, more concisely, 100. :)

              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]

              T Offline
              T Offline
              TeVc
              wrote on last edited by
              #12

              Thanks for reply but it's not working.

              CString store[100];
              CString File;
              and int cou=0;
              store[cou]=File.

              File name added at the run time.Plz help me

              CPalliniC 1 Reply Last reply
              0
              • T TeVc

                Thanks for reply but it's not working.

                CString store[100];
                CString File;
                and int cou=0;
                store[cou]=File.

                File name added at the run time.Plz help me

                CPalliniC Offline
                CPalliniC Offline
                CPallini
                wrote on last edited by
                #13

                What does it mean 'it's not working?' in such context? What are you trying to do? What happens instead? :)

                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?

                T 1 Reply Last reply
                0
                • CPalliniC CPallini

                  What does it mean 'it's not working?' in such context? What are you trying to do? What happens instead? :)

                  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]

                  T Offline
                  T Offline
                  TeVc
                  wrote on last edited by
                  #14

                  store[cou]=File;

                  int iSize=sizeof(store);

                  AfxMessageBox(iSize);

                  Then i am geting Debug Assertion Fail Line number:163.

                  CPalliniC 1 Reply Last reply
                  0
                  • T TeVc

                    store[cou]=File;

                    int iSize=sizeof(store);

                    AfxMessageBox(iSize);

                    Then i am geting Debug Assertion Fail Line number:163.

                    CPalliniC Offline
                    CPalliniC Offline
                    CPallini
                    wrote on last edited by
                    #15

                    On what line does the code assert? BTW your array is fixed-sized to 100 elements, regardless if you assign or not any of them. :)

                    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?

                    T 1 Reply Last reply
                    0
                    • CPalliniC CPallini

                      On what line does the code assert? BTW your array is fixed-sized to 100 elements, regardless if you assign or not any of them. :)

                      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]

                      T Offline
                      T Offline
                      TeVc
                      wrote on last edited by
                      #16

                      Thank Now it is working.Your code is good.I make a mistake.SO thanks again.Ome more question how can i use dynamic array.Plz help me

                      CPalliniC 1 Reply Last reply
                      0
                      • T TeVc

                        Thank Now it is working.Your code is good.I make a mistake.SO thanks again.Ome more question how can i use dynamic array.Plz help me

                        CPalliniC Offline
                        CPalliniC Offline
                        CPallini
                        wrote on last edited by
                        #17

                        If you need an array that grows dynamically then have a look at std::vector. MFC has the CArray container but it's a crap (please don't tell this to Rajesh :rolleyes: ). very basic (and naive) vector usage sample follows:

                        #include <iostream>
                        #include <string>
                        #include <vector>

                        using namespace std;
                        void main()
                        {

                        vector < string > v;

                        v.push_back(string("hi,"));
                        v.push_back(string("how"));
                        v.push_back(string("do you do?"));
                        cout << "vector size = " << v.size() << endl;
                        for (int i=0; i<v.size(); i++)
                        {
                        cout << v[i] << " ";
                        }
                        cout << endl;
                        }

                        :)

                        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?

                        T 1 Reply Last reply
                        0
                        • CPalliniC CPallini

                          If you need an array that grows dynamically then have a look at std::vector. MFC has the CArray container but it's a crap (please don't tell this to Rajesh :rolleyes: ). very basic (and naive) vector usage sample follows:

                          #include <iostream>
                          #include <string>
                          #include <vector>

                          using namespace std;
                          void main()
                          {

                          vector < string > v;

                          v.push_back(string("hi,"));
                          v.push_back(string("how"));
                          v.push_back(string("do you do?"));
                          cout << "vector size = " << v.size() << endl;
                          for (int i=0; i<v.size(); i++)
                          {
                          cout << v[i] << " ";
                          }
                          cout << endl;
                          }

                          :)

                          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]

                          T Offline
                          T Offline
                          TeVc
                          wrote on last edited by
                          #18

                          Thanks for help.Every reply boost me..

                          CPalliniC 1 Reply Last reply
                          0
                          • T TeVc

                            Thanks for help.Every reply boost me..

                            CPalliniC Offline
                            CPalliniC Offline
                            CPallini
                            wrote on last edited by
                            #19

                            :)

                            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
                            • T TeVc

                              Thanks for reply but it's not working i have a CString store[100];,CString File; and int cou=0;. And i use store[cou]=File. And i want to get Size of store[cou].Plz help me

                              M Offline
                              M Offline
                              MANISH RASTOGI
                              wrote on last edited by
                              #20

                              store[cou].GetLength()

                              1 Reply Last reply
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