Array question..

This is a discussion on Array question.. within the C++ Programming forums, part of the General Programming Boards category; I have wrote this program to calculate the 5 elements of an array.. Code: #include <iostream.h> #include <stdlib.h> #include <iomanip.h> ...

  1. #1
    Registered User snapshooter's Avatar
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    Array question..

    I have wrote this program to calculate the 5 elements of an array..
    Code:
    #include <iostream.h>
    #include <stdlib.h>
    #include <iomanip.h>
    
    using namespace std;
    
    int main(int argc, char *argv[])
    {
    int n[5],i;
    
    for(i=0;i<5;i++)
    {
        cout<<"Value for n["<<i<<"]:";
        cin>>n[i];
    }    
    
    for(i=0;i<5;i++)
    {
    cout<<i<<":"<<n[i]<<endl;
    }
    
    int sum=n[0]+n[1]+n[2]+n[3]+n[4];
    cout<<"The sum is:"<<sum<<endl;
    
      system("PAUSE");	
      return 0;
    }
    could someone tell me (if it is) a way to calculate mora than 4 elements,,lets say the array have 100 elements..
    Thanks in advance!

  2. #2
    Code Goddess Prelude's Avatar
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    >could someone tell me (if it is) a way to calculate mora than 4 elements
    Yes, but it's error prone and not very scalable. Have you considered using a loop instead?
    Code:
    int sum = 0;
    for ( int i = 0; i < 5; i++ )
      sum += n[i];
    My best code is written with the delete key.

  3. #3
    VA National Guard The Brain's Avatar
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    Got a few warnings when I compiled this:


    C:\MySource>bcc32 argc.cpp
    Borland C++ 5.5.1 for Win32 Copyright (c) 1993, 2000 Borland
    argc.cpp:
    Warning W8057 argc.cpp 27: Parameter 'argc' is never used in f
    Warning W8057 argc.cpp 27: Parameter 'argv' is never used in f
    Turbo Incremental Link 5.00 Copyright (c) 1997, 2000 Borland
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  4. #4
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    You could do this.

    Code:
    int n[100], i, sum;
    
    sum = 0;
    
    for(i = 0; i < 100; i++)
    {
        cout << "Value for n["<<i<<"]:";
        cin >> n[i];
        sum +=  n[i];
    }    
    
    for(i=0; i < 100; i++)
    {
        cout << i << ":" << n[i] << endl;
    }
    Im pretty sure thatll work...Didnt test it but wrote it up in word, hope it helps
    Last edited by Siggy; 11-20-2004 at 09:36 AM.

  5. #5
    Registered User snapshooter's Avatar
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    Thanks for the help guys..my program works fine!

  6. #6
    VA National Guard The Brain's Avatar
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    I was just thinking about arrays.. and then i started thinking aboot vectors.. and then I was like, "hmm.. is there a way in c++ to make multi-dimensional vectors..?" I've never seen code for this type of implementation but i think it would be a cool data structure.
    • "Problem Solving C++, The Object of Programming" -Walter Savitch
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  7. #7
    & the hat of GPL slaying Thantos's Avatar
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    Quote Originally Posted by The Brain
    I was just thinking about arrays.. and then i started thinking aboot vectors.. and then I was like, "hmm.. is there a way in c++ to make multi-dimensional vectors..?" I've never seen code for this type of implementation but i think it would be a cool data structure.
    std::vector< std::vector<T> >

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    VA National Guard The Brain's Avatar
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    ahh.. a vector of vectors..
    • "Problem Solving C++, The Object of Programming" -Walter Savitch
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  9. #9
    & the hat of GPL slaying Thantos's Avatar
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    Wanna guess what a 12th dimension vector would look like?

  10. #10
    Registered User hk_mp5kpdw's Avatar
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    Quote Originally Posted by snapshooter
    could someone tell me (if it is) a way to calculate mora than 4 elements,,lets say the array have 100 elements..
    A possible way to do that:

    Code:
    #include <numeric>
    ...
    int n[100];
    ...
    // Stuff 100 values into array
    ...
    // Calculate sum of all 100 elements
    int sum = std::accumulate(n,n+100,0);
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
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  11. #11
    VA National Guard The Brain's Avatar
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    Wanna guess what a 12th dimension vector would look like?

    Just out of curiosity.. how would you pushback( ) to let's say.. the 5th dimension of a 12 dimension vector...?
    • "Problem Solving C++, The Object of Programming" -Walter Savitch
    • "Data Structures and Other Objects using C++" -Walter Savitch
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  12. #12
    & the hat of GPL slaying Thantos's Avatar
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    Very very very carefully. Basically you'll have to use an iterators to get to the 5th dimension and then use push_back() on that.

    edit:
    Or:

    Code:
    vector < (insert other vectors) > > > > > > > > > > > > vec;
    vector < (insert 4 other vectors) bleh;
    vec[0][0][0][0][0].push_back(bleh);
    Last edited by Thantos; 11-23-2004 at 08:52 PM.

  13. #13
    Toaster Zach L.'s Avatar
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    Quote Originally Posted by Thantos
    Wanna guess what a 12th dimension vector would look like?
    Ack! That's hideous.
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  14. #14
    Cat without Hat CornedBee's Avatar
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    Code:
    template <unsigned int depth, typename type>
    struct vec_gen
    {
      typedef std::vector < typename vec_gen<depth - 1, type>::result > result;
    
      typedef char[depth - 1] null_protection;
    };
    template <typename type>
    struct vec_gen<1>
    {
      typedef std::vector <type> result;
    };
    Wanna guess what a 12th dimension vector would look like?
    Like this:
    Code:
    typedef typename vec_gen<12, int>::result ivec12;
    All the buzzt!
    CornedBee

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    Cheater

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