Complete the following Exercise from Chapter $4$:

Ex$.4\mathrm{.}23($Calculating the Compound Interest with Integers$)$ Modify the program of Fig. $4\mathrm{.}44\mathrm{.}5.$ If you would rather not type in the code from Fig. $4\mathrm{.}4$ and you have downloaded and unzipped CHowtoProgram$9$e$-$master.zip Download CHowtoProgram$9$e$-$master.zip, you should be able to find the Fig. $4\mathrm{.}4$ source code file to modify.