C++: some multiple choice questions and tow coding question; basic concepts about pointer, null pointer, class inheritance. coding part: implementing class inheritance, max difference of two numbers on array will it compile or not, why will it or why not. if yes what is the output. code is about pointers, function overloading with dynamic memory, class, pointer to base class with dynamic memory. math questions: matrix identities, inverse of matrix, vector manipulation, limits: all the basics, some other linear algebra questions