This code example opens a file named "data.txt" for reading using the RFile class. It then checks if the file was successfully opened and outputs a message accordingly. Code Example 2:c++ #include "RFile.h" #include "TTree.h" int main() { RFile file("data.root", "READ"); TTree* tree = nullptr; if (file.IsOpen()) { // read the tree named "myTree" from the file tree = (TTree*)file.Get("myTree"); // do some processing on the tree } return 0; } ``` This code example opens a ROOT file named "data.root" for reading and extracts a TTree object named "myTree" from it. It then does some processing on the tree object. In summary, the RFile class in C++ is a part of the ROOT package library and provides an interface for reading data from files. It allows you to open files and read data from them using various read methods.