Using C$++$ please write a simple code as if a normal casual college student would write it and please dont use any library other than iostream if possible:

Assume the following class and then answer the questions below :

class course$\{$

char$*$ name;

double mark$[3]$;$//$ first, second and final marks

$\}$;

$1.$ Write all the constructors for all parameter of the class.

$2.$ Write a function that takes a course and returns the final mark of this course.

$3.$ In the main function create an array of $100$ courses.

$4.$ Write a function that returns all failed courses in the created array