Write the function prototypes for the following functions (do NOT implement the functions). a)  displayInstructions: a function that doesn’t receive any inputs and prints some instructions to the screen. b)  toUpperCase: a function that returns an upper-case character that corresponds to the lower-case character passed to it. c)  isPositive: a function that takes as input a double number and returns whether the number is positive or not. d)  computeArea: a function that takes as input two double numbers corresponding to the sides of a rectangle and returns the area of that rectangle. e)  getNumber: a function that asks the user to enter an integer and returns that number.

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