Contractors - Could these cracks mean foundation trouble? *PICS*

[Melissa Searing]

Hi there! I am looking for a house to flip in Charleston, SC and found this distressed property. I know that I will need to get an inspection and possibly a structural engineer's opinion. I am just wondering if any assumptions can be derived from the presence of these cracks in the floor in regards to foundation issues. (I also included pics of a deck that was removed from the back of the house. I'm not sure if it is related to the problem, but the deck is located off of the room/hall with the cracks).

 Thanks!