Instructions

The ESA (Exercism Space Agency) is at full speed in planning a new mission to Phobos, a moon of Mars. The mission's goal is to land a probe on Phobos's surface and send back data about the surface. ESA has requested your help in building the navigation computer for the probe. The navigation computer has limited memory, so we need to keep the memory usage as low as possible. Therefore, we need to use the suitable data types.

1. Navigation constants

The navigation computer needs to know the distance between some objects in space to do the correct calculations, the distance is measured in km.

Define the following constants:

• NEPTUNE_DISTANCE with the value 4_400_000_000 which should be stored as a Int64
• MARS_DISTANCE with the value 227_940_000 which should be stored as a Int32
• ATMOSPHERE_DISTANCE with the value 10_000 which should be stored as a Int16

2. Correct area analysis

The navigation computer needs to know the area of some objects in space to do the correct calculations. An area can NOT be negative. The engineers planned the program to generate an overflow error when the area was negative. However, the engineers forgot to change the signed integer to an unsigned integer.

Therefore, engineers would like a program that converts a signed integer to an unsigned integer.

Implement the Navigation#correct_area_analysis method that takes a measurement as an argument and returns the area as an unsigned integer with 32 bits.

3. Calculate the velocity

The navigation computer needs to know the velocity of the probe. The velocity is measured in m/s.

To calculate velocity, we need to know the distance traveled and the time it took to travel that distance. Then, take the distance and divide it by the time.

The velocity can be something other than accurate and will never be a considerable number. Therefore, we can use a Float32.

Implement the Navigation#calculate_velocity method that takes distance and time as arguments and returns the velocity as a Float with 32 bits.