43. Write function prototypes for following functions. [12 points] 1) The function, findMax that takes a double array and its size as parameters, and returns the biggest value out of the elements of the array 2) The function ceiling that takes one double number and returns the smallest integer which is greater than the given number. 3) The function grade that takes two scores int number and returns the char grade. If the second score is not specified, 80 is given by default. 4) The void function readTwoScores that reads two int scores and returns them. (You need reference parameters)