What is the purpose of the fwrite function in C++?

The fwrite function in C++ is used to write data to a file, it functions to write specified data to a specified file. The prototype for the fwrite function is:

size_t fwrite(const void* ptr, size_t size, size_t count, FILE* stream);

Explanation of parameters:

1. ptr: a pointer pointing to the data to be written.
2. size: the size of each data item to be written (in bytes).
3. count: the number of data items to be written.
4. stream: a pointer to a FILE structure that specifies the file to write to.

The fwrite function writes specified data to a designated file and returns the actual number of data items written. If an error occurs, the returned number of data items may be less than count.