How do you write a quiz using files and struct?

Answer 1

There are many ways. The simplest way would be to use a structure (Q) with two members: a pointer to the question and a pointer to the answer. If the quiz is text-based, then both pointers will point to null-terminated strings. If the quiz is multiple choice, then the answer may point to another structure (A) containing a dynamic array of pointers to null-terminated strings, along with a zero-based index to the correct answer. Either way, you can build a series of questions using a one-dimensional array of Q structures.

To store the data in a file, you simply store the count of questions (the number of elements in the Q array) and then sequentially write all of the questions followed by all of the answers. If the answers are a multiple choice structure (A), then store the number of elements in the answer array, the zero-based index of the correct answer, and then the answer array itself. When you read the file back, you can rebuild the original array.

Of course anyone can read the text file outwith your program and cheat the quiz. To avoid this, obfuscate the answers by XOR-ing each character (other than the NULL terminator) with a pre-determined, nonzero character code. When you read the file back, XOR the characters with that same character code to restore the original characters. This is a simplistic cipher but it will be enough to deter most would-be cheaters.

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