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ZakAttk1
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How do I use file streams to extract numbers from a file, add them up, and average them out?
File streams are a way for a computer program to read or write data to a file. It is a sequence of bytes that can be accessed in sequential or random order.
ifstream is used for reading input from a file, while ofstream is used for writing output to a file. The main difference is the direction of data flow.
To open a file stream in C++, you need to include the <fstream>
header file and use the ifstream
or ofstream
class constructor, passing in the file name as a parameter.
If a file cannot be opened with an ifstream or ofstream, it could be due to the file not existing, the file being already open by another program, or the file having incorrect permissions. In these cases, an error will be thrown and the program will not be able to read or write to the file.
To close a file stream, you can use the close()
method on an ifstream or ofstream object. This will release any resources associated with the file and prevent any further operations on the file.