Object oriented programming and polymorphism in C

How to implement objects and polymorphism in C? Tutorials to get started with C before watching pointers and references: https://www.tutorialspoint.com/cprogr... memory allocation: https://www.geeksforgeeks.org/dynamic... structs: https://www.tutorialspoint.com/cprogr... function pointers: https://www.geeksforgeeks.org/functio... typedef: https://www.tutorialspoint.com/cprogr...