C does not have the formal construct of a class. You can produce modules with module-level data that by your own agreement you will not extern anywhere else, or static data, and write functions to get, set, and otherwise manipulate that data. You can even go to the point of using function pointers to manipulate similar data types as if they were in a class.
However, you won't be protected by class semantics or other rules by the C compiler, because the C compiler does not know about classes. However, structuring your data is quite powerful.
