write_to_file.C

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void write_to_file(){
 
    // Instance of our histogram
    TH1F h("my_histogram","My Title;X;# of entries",100,-5,5);
 
    // Let's fill it randomly
    h.FillRandom("gaus");
 
    // Let's open a TFile
    TFile out_file("my_rootfile.root","RECREATE");
 
    // Write the histogram in the file
    h.Write();
 
    // Close the file
    out_file.Close();
}