How to solve C++ questions below? Please help!!!

Given the copy method below that can copy information from a generic std::istream to a generic std::ostream, illustrate calls to the method to perform the necessary functionality. The first one is already completed to illustrate an example.

void copy(std::istream& is, std::ostream& os);
Desired functionality	Code fragment
Print all of the information from a file named readme.txt to the console.	std::ifstream in("readme.txt"); copy(in, std::cout);
Copy file named source.txt to a file named copy.txt.
Write all of the data from a string variable named bigInfo to a file named info.txt.
Read all of the data from a file named loadMe.txt into a string name heavyLoad.