1. We have moved from vBulletin to XenForo and you are viewing the site in the middle of the move. Though the functional aspect of everything is working fine, we are still working on other changes including the new design on Xenforo.
    Dismiss Notice

(C++) trouble importing numerical, non integer, data

Discussion in 'C++' started by lnname, Jan 20, 2010.

  1. lnname

    lnname New Member

    Joined:
    Jan 20, 2010
    Messages:
    4
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    york uk
    i have a file called "test_data_4" which contains a single column of 20001 numerical values

    "1.09964047e+001
    1.10765811e+001
    1.11526284e+001
    1.12244983e+001
    1.12921441e+001
    1.13555205e+001
    1.14145834e+001
    1.14692903e+001
    1.15196004e+001
    ...."

    and so on

    I am writting a program that reads the file and have got stuck.

    Code:
    #include <vector>
    #include <cstdlib>
    using namespace std;
    int main()
     {
     ifstream infile("test_data_4.dat");
            cout << "reading from file"<<endl;
            cout<<"how many points shall we consider ";
            int N=0;cin>>N;         //the numbers of data points we shall take from the file
            vector<long> data(N);   //the vector we assemble from the file
            cout<<"reading from the file "<<endl;
            long n=2;int j=0;
            while(j<N)
                {
                infile >> n;cout<<n<<endl;
                data[j]=n;
                j++;
                }
            // Note that n is overwritten every time we loop
     infile.close();
        cout << "The file comtains the list of values:"<<endl;
            for(int i=0; i<(int) data.size(); i++)
                {cout << data[i] << endl;}
     
     return 0;
     }
    
    It currently seems to think that all the above are simply repetitions of the number 1.
     
    Last edited by a moderator: Jan 21, 2010
  2. lnname

    lnname New Member

    Joined:
    Jan 20, 2010
    Messages:
    4
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    york uk
    Hmmnn i've tried importing various different versions of test_data_4 and it seems to import all the data up to the full stop
     
  3. lnname

    lnname New Member

    Joined:
    Jan 20, 2010
    Messages:
    4
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    york uk
    actually problem solved; i was using longs instead of long doubles
     

Share This Page