Writing/reading structure to/from binary file in c?

The problem is that your structure is dynamic (due to the vector). This is always going to complicate things, because you are actually storing a char *. The vector is a complex data structure.

You can't just mask it as a char * and expect it to represent the elements. So you aren't even storing what you need. I would suggest you change the vector to something like int gradesNO_OF_SUBJECTS .

That should work fine.

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