Hello everyone,

I need a help with the reading .dat file for my optimization problem coded by C++ (Under Visual Studio)

I have a .dat file conrains three arrays like this

[1, 1, 1]

[[4, 5 ,5]

[4 ,5 ,5]

[4 ,5, 5]

[4, 5, 5]]

[4 ,5 ,5, 5]

How can I open and read this .dat file ?

Thank you in advance

Dear Milena,

You could write an opl script to dump the .dat information in an easy-to-read format for C++ (e.g. whitespace separated tokens).

Then use the << C++ operator on stream to read the data.

I hope this helps.

Cheers.

Thank you so much Renaud, I changed my .dat file and now it contains only one array (named Pr) , which is [10, 10, 10]

I have written a script like this :

IloNumArray Pr(env);

 const char* filename = "Project.dat";

 if (argc > 1)        

  filename = argv[1];  

 ifstream file(filename);

 if (!file) {

  cerr << "ERROR: could not open file '" << filename << "' for reading" << endl;  

   cerr << "ERROR: could not open file for reading" << endl; 

   cerr << "usage:  " << argv[0] << " <file>" << endl;        

   throw(-1);

  }

 file >> Pr ;

 cout << Pr << endl;

When I print to check if it is written or not it gives me

[]

not

[10, 10, 10] as we expect ? I could not understand what is the problem? (When I say file <<, it does not recognize the << operator) I use Visual Studio for C++. Do you have any idea ? Thank you so mcuh in advance