(b) Write the complete source code for the above statement based on the following requirement. (i) One (1) function pass-by-reference as an input from the user, void user_input(double&);. (ii) One (1) function pass-by-reference to calculate the speed, double calculate(double&);. (iii) One (1) function pass-by-reference to display a warning if the speed exceeds the limit, void display_warning(double&);. (iv) Global variables are not allowed. (V) Must use cmath library function as in Figure Q3(b). (vi) The program can repeat until the user chooses to end or exit. [17 marks] pow() Syntax The syntax of the pow() function is: