QUESTION 2 [20 Marks] a. Develop a C++ program using function that converts electric power, Pin watts (W) to electrical voltage, Vin volts (V), provided the current, I in amps. For example, if the user enters 45 for electrical power in W, and the I is 3A, the electrical voltage in V would be 15 V. Show all the components of the function. The formulation for V is as in the equation below: Vw = Pw/IA [10 marks] b. Compose C++ coding to show the differences in passing by value and passing by pointers for Question 2(a). Briefly explain the different between passing by value and passing by pointer in function. [10 marks]