(C++)

Hello, please answer about this question in C++ please.

*Do not use any pointers or dynamic arrays please!

A. Write a function that takes as arguments two vectors (ux, uy, ux) and (vx, vy, vz), computes the cross product of those vectors, and stores the result in pass-by-reference parameters (wx, wy, wz). (If you do not remember the formula for the cross product, look it up.) Here each component is of type double, and the components are not grouped as arrays (so each component is a separate parameter) B. Redo Problem A except assume that the parameters are three arrays u, v, and w, each of which are three-element arrays. C. Write a function that takes in a C++-style string s, as well as an integer n, and then returns true if any substring of length n in s repeats itself, and false otherwise. For example, if s is "toe-to-toe" and n is 3, then the function would return true since "toe" occurs twice within s. However, if n were 4 the function would return false. As a second example, if s is "singing" and n is 2, then the function would return true since, e.g., "in" appears more than once (as does "ng"). In this problem you may use any of the C++ string member functions