Read integer from txt file of 1D containg dat

[Dosa]

_Hello dear
I have .txt file contains one column of data and I want the C++ part of ROOT macro gives me a value for specific ith .
if (i == 6);
ifstream myfile(“factors.txt”);
sigma[i]=0.;
myfile >> sigma[i] >> endl;
cout << sigma [i] << endl;
final= voltage * sigma[i];

factors.txt contains:
0.445
0.034
0.56
0.44
0.23
0.12
0.12
0.70
…
…

Thank you in advance
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ROOT Version: Not Provided
Platform: Not Provided
Compiler: Not Provided

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[Wile_E_Coyote]

This is unrelated to ROOT … Google -> learn C++