Currency Conversion Program

Application – Level Requirements

1. Get input from user. 2. User selects the type of currency they wish to convert. 3. User enters the amount of currency they wish to convert. 4. Currency is converted using established conversion rates. 5. Completed conversion amount is displayed for the user.

IPO Chart

Input | Process | Output | (Keyboard) User enters selection | Get type of foreign currency | ForeignCurrencyType (string) | (Keyboard) User enters amount | Get amount of foreign currency | ForeignCurrency (float) | Rate (float)ForeignCurrency (float) | Convert Currency | USDollar (float) | ForeignCurrencyType (string)ForeignCurrency(float)USDollar (float) | Display converted currency | (output results to screen) |

Main Module

Display Module
User Input Module
Menu Module

Calculation Module

Control Flow Diagram—Main Control

-------------------------------------------------
Begin
Menu Module Quit
?
Thank you for using the currency conversion program.”

User Input Module

Yes
No
Calculation Module

Display Module

End

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Control Flow Diagram—Menu Module

Begin
Welcome message

Valid selection ?
Error
4
:
Invalid menu selection
No
Yes
End
Quit
?
Yes
Write “Are you sure?”

Quit
Verified
?

Yes
Select foreign currency type

Is selected currency correct?

No
Conversion
Verified
?
No
Yes

No |

Control Flow Diagram—User Input Module

Please enter the amount of foreign currency you would like to convert.

Write “Please enter a non-negative number.”

Input ForeignCurrency

Write “Invalid entry. Please try again.”

|

Control Flow Diagram—Calculation Module

French?
Japanese?
Mexican?
Begin
Canadian
?
Rate = 1.4680

English
?

No
No
No
No
No Yes
Yes
Yes
Yes
Yes
Rate = 9.5085

Rate = 0.6085

Rate = 104.9200