Three questions
1. how do you put two flags on a fout() order?

2. How woult you write 4 arrays of objects to a binary file (could this file be a .dat file)?

3. How would you read the arrays back again

The reason for Q's 2 and 3 is to make a database program but with the data stored in a file (the program will have a limited writing facility) insted of 400 ish lines of code creating the objects every time the program was run.

Not a clue what you mean. What's an fout() order?

Use fwrite() on each entire array.

Use fread() in the same order.

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fout() the order used to open a file for writing included in fstream.h in standard librarys