Compound interest.

(a) Write a function to compute and return the amount of money, A, that you will have in n years if you invest P dollars now at annual interest rate i. Take n, i, and P as parameters. The formula is

A = P(1 + i)n

(b) Write a function to compute and return the amount of money, P, that you would need to invest now at annual interest rate i in order to have A dollars in n years. Take n, i, and A as parameters. The formula is:

P =A / (1 + i)n

(c) Write a function that will read and validate the inputs for this program. Using call by value/address, return an enumerated constant for the choice of formulas, a number of years, an interest rate, and an amount of money, in dollars. All three numbers must be greater than 0.0.

(d) Write a main program that will call the input routine to gather the **data. Then, depending on the user’s choice, it should call the appropriate calculation function and print the results of thecalculation**

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