The previous two increments were stand-alone programs. However, that is not the case in real-life software systems. In fact, they comprise hundreds, even thousands of procedures enclosed within separate program units, such as Fortran modules or C++ classes. In those systems, procedures include the module(s)/classes they use by means of the use directive or the #include directive. This final increment will integrate the two previous increments with this one into a small software system that will have a menu-driven user interface. As a result, the two previous incremental programs will become Fortran modules or C++ classes. The separately compiled modules/classes, along with the additional functionality below, and the driver program will make up a Fortran/C++ application.
Develop a Fortran/C++ software system that will display a menu, accept the user’s choice, validate the entry and proceed to the corresponding module(s)/class(s), or exit. In addition, the application must:
This increment will make some economic cost-benefit calculations based on the fact that re-usable booster-rockets are now a reality. These are some websites where you can find information on the matter of re-using rockets: Definition and some examples from Wikipedia, SpaceX’s Falcon Heavy rocket and Wikipedia’s Falcon Heavy article.
By the rule of economies of scale, the more a single vehicle can be re-used, the lower the costs per launch, and therefore of the payload. However, realistically a vehicle can be used up to a number of launches. Factors, such as metal fatigue due to forces acting upon it, oxidation (rusting) due to over-heating at atmosphere re-entries and combustion chamber oxidation, set a limit on the number of times the vehicle can be re-launched. Hence, in this project increment you are to calculate the variations of cost per metric ton and per pound of payload, subject to the following assumptions:
Cost of rocket (user-entered): $10,000,000 ≤ rocketCost ≤ $75,000,000
Maximum number of missions (user-entered): 1 ≤ numMissions ≤ 25
Maximum payload to LEO: 53 metric tons (53,000 kg)
Launch costs: $25,000,000
Rocket depreciation: rocketCost / numMissions
For each case, also calculate the price to the client assuming a gross margin of 50% over costs. Conversion factors:
1 metric ton = 1,000 kg 1 kilogram = 2.2046 lb
The program must validate that the data-entries are within the allowed ranges. Assume maximum payload capacity for each mission. In addition, the program must work for as long as the user wishes. Notice: if the equation for the costs per pound
Note: Use the “Developing a C++/Fortran Program” handout as a guide. The submitted code should comply with all requirements for projects set forth in the Projects and Labs Rubric document. A sample object code will be available for you to experiment and see how your own program must work.
 Launch costs include NASA’s launch-pad rent fees, fuel, launch-pad staff, payload insurance, rocket preparation and loading, and finance charges on rocket construction and R&D.
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