$12.$ Go back to the future$\_$value.py file. Then, comment out the get$\_$number and get$\_$integer$()$ functions.

$13.$ Add an import statement that imports the validation module.

$14.$ Modify the code in the main$()$ function so it uses the functions in the validation module

When you completed modifications shown above, then enhance your program so the console will look something like this:

Financial Calculator Options

$1.$ Future Value Calculation

$2.$ Simple Interest Calculation

$3.$ Quit

Choose an option $(1-3)$: $1$

monthly investment:$0$

Entry must be greater than $0$ and less than or equal to $1000$

Enter monthly investment:$100$

Enter yearly interest rate:$16$

Entry must be greater than $0$ and less than or equal to $15$

Enter yearly interest rate:$12$

Enter number of years:$100$

Entry must be greater than $0$ and less than or equal to $50$

Enter number of years:$10$

Future Value $=23233\mathrm{.}91$

Financial Calculator Options

$1.$ Future Value Calculation

$2.$ Simple Interest Calculation

$3.$ Quit

Choose an option $(1-3)$: $2$

Enter principal amount: $15000$

Entry must be greater than $0$ and less than or equal to $10000$

Enter principal amount: $5000$

Enter annual interest rate: $101$

Entry must be greater than $0$ and less than or equal to $100$

Enter annual interest rate: $12$

Enter time period $($in years$)$: $51$

Entry must be greater than $0$ and less than or equal to $50$

Enter time period $($in years$)$: $10$

Simple Interest: $6000\mathrm{.}0$

Financial Calculator Options

$1.$ Future Value Calculation

$2.$ Simple Interest Calculation

$3.$ Quit

Choose an option $(1-3)$: $3$

Goodbye!

The new enhancement is Adding a Menu for Multiple Options

$15.$ Display Menu: A function display$\_$menu$()$ is created to show the user the available options $($e$.$g$.,"1.$ Future Value Calculation", $"2.$ Simple Interest Calculation", $"3.$ Quit"$).$

$16.$ Main Loop for Menu:$$ The main$()$ function contains a while loop that runs indefinitely until the user chooses to quit by selecting option $"3".$

$17.$ Based on the user$$s input, the program uses conditional checks $($if$-$elif$-$else$)$ to decide which operation to perform.

$18.$ Simple Interest Calculation: Prompts for principal, interest rate, and time $($years$),$ then computes simple interest as this:$$

$$ simple$\_$interest $=$ principal $*($interest$\_$rate $/100)*$ years$$ where principal, interest$\_$rate and years are user input values

$```$

def calculate$\_$future$\_$value$($monthly$\_$investment, yearly$\_$interest, years$)$:

# convert yearly values to monthly values

monthly$\_$interest$\_$rate $=$ yearly$\_$interest $/12/100$

months $=$ years $*12$

# calculate future value

future$\_$value $=0\mathrm{.}0$

for i in range$($months$)$:

future$\_$value $+=$ monthly$\_$investment

monthly$\_$interest $=$ future$\_$value $*$ monthly$\_$interest$\_$rate

future$\_$value $+=$ monthly$\_$interest

$```$

return future$\_$value

def main$()$:

choice $="$y$"$

while choice.lower$()=="$y$"$:

# get input from the user

monthly$\_$investment $=$ float$($input$("$Enter monthly investment:$\backslash$t$"))$

yearly$\_$interest$\_$rate $=$ float$($input$("$Enter yearly interest rate:$\backslash$t$"))$

years $=$ int$($input$("$Enter number of years:$\backslash$t$\backslash$t$"))$

## get and display future value

future$\_$value $=$ calculate$\_$future$\_$value$($

monthly$\_$investment, yearly$\_$interest$\_$rate, years$)$

print$($f$"$Future value:$\backslash$t$\backslash$t$\backslash$t$\{$round$($future$\_$value, $2)\}")$

print$()$

$**$ see if the user wants to continue

choice $=$ input$("$Continue$?($y$/$n$)$: $")$

print$()$

print$("8$ye$!")\backslash (==\backslash )$

$\backslash (\backslash$operatorname$\{$main$\}()\backslash )$ main $\backslash ("$: $\backslash )$