Read series data from txt file

[edi aceh]

Dear forums members',

I am really beginner, and just registered in this forum 10 minutes a go. I got C++ code from Japanese professor, and I want to modify this code for my study purpose. The first step I want to modifying this code from static to little bit dynamic. For instance, determine gas pressure in tank by using ideal gas equation (P=nRT/V). If we assumed amount gas and volume tank are fixed for whole year, the daily gas pressure should be depend on atmospheric temperature.

I will very grateful if some one wishing teach me how to write syntax to read daily atmospheric temperature up to 10.000 days (for example) from txt file.

Best wishes,

Edi

[hamsterman]

see http://www.cplusplus.com/doc/tutorial/files/
then use a loop to read the numbers and an array or vector to store them.

[edi aceh]

Dear Hamsterman,

Thank a lot for your reply. Since I just beginner, it was difficult for me to understand what you explain about. As additional information, I saved data in atm_temp.txt consist of two column like below:
Time Temp.
(day) (K)
1 281.75
2 280.15
3 273.05
4 269.25
. .
. .
. .
999 290.05
1000 291.00

I will grateful if you wish to explain more detail.

Best wishes,

Edi

[Albatross]

To read from a file, you'll probably want to use an ifstream or fstream, as described in the link hamsterman gave you.

To store the data, I'd suggest using reading the data into a temporary variable designed to hold your data, and then push_/*it*/back() into a vector, like so:

#include <vector>
/*Skip a few lines...*/
std::vector<data_type> data;
data_type temp;
while(open_ifstream.good())
{
    open_ifstream >> temp;
    data.push_back(temp);
}

EDIT: That looks a bit better.

-Albatross