double number was cut off

Junhui Liao (18)
Dear all,

My script aims to save data in vector.
However, the original data was cut off
after the script's running.
Like this: original data is : 9.9968853238E-04,
after running, the saved data is : 0.00099688.

I tried to change from double to long double,
but same result also.

Can anybody give a suggestion ?
Thanks a lot in advance!
Junhui

The code is here:



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#include <iostream>
#include <sstream>
#include <fstream>
#include <vector>
#include <string>
#include <cstring>

using namespace std;

int main ()
{

    ifstream inFile ("../test_7_10lines.tsv");
    //ifstream inFile ("../two_ch.tsv");
   if (!inFile.good() || !inFile.is_open() )
   {
      std::cout << "\nWARNING! Cannot read from file: " <<" ../two_ch.tsv"<< std::endl;
   }
    string line;
    int linenum = 0;
    vector <double> time;
    vector <double> vol;
    double time_base[4096];
    while (getline (inFile, line))
    {
        linenum++;
        int itemnum = 0, j = 0;
        istringstream linestream(line);

        if(linenum >= 22)
        {
             string item;
             itemnum = 0;
              while (getline (linestream, item, '       '))
              {
    double time_, vol_, time_origin;
                 j = (linenum - 22)* 8192 + itemnum ;
                 itemnum ++;
                 if ( (itemnum % 2) != 0)
                    {
                       istringstream(item) >> time_  ;
                       cout << "time_ = " <<time_<<endl;
                       time.push_back(time_) ;
                      // cout << "time[j] = " <<time[j]<<endl;
                    }
                 else
                    {
                       istringstream(item) >> vol_  ;
                       vol.push_back(vol_);
                    }
              }
        }
    }
inFile.close();
}
guestgulkan (2942)
You mean that it displayed on the screen using cout is not what you expect??

If so, you need to look up output stream manipulators ( fixed, scientific and setprecision() )
Junhui Liao (18)
Hi, guestgulkan,

Thanks a lot for your comment.
Based on your explanation, the
problem was closed.

Thanks again!
Junhui
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