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In this exercise you'll be modelling a weighing machine.

The weight can be set and retrieved in pounds or kilograms and cannot be negative.

The weight can be displayed in SI units or US units , pounds and ounces.

A tare adjustment can be applied to the weight (for instance to deduct the weight of a container). This can be any value (even negative or a value that makes the display weight negative) as there are doubts about the accuracy of the weighing machine. For security reasons this value cannot be retrieved.

Note that:

display-weight = input-weight - tare-adjustment

Conversion ratios are as follows:

  • 16 ounces to a pound
  • 2.20462 kg to a pound

For Example:

  • 60 kilograms == 132.2772 ponds
  • 132.2772 pounds == 132 pounds 4 ounces

You have 5 tasks each of which requires you to implement one or more properties:

1. Allow the weight to be set on the weighing machine

Implement the WeigingMachine.InputWeight property to allow the weight to be get and set:

var wm = new WeighingMachine();
wm.InputWeight = 60m;

//  => wm.InputWeight == 60m

2. Ensure that a negative input weight is rejected

Add validation to the WeighingMachine.InputWeight property to throw an ArgumentOutOfRangeException when trying to set it to a negative weight:

var wm = new WeighingMachine();
wm.InputWeight = -10m; // Throws an ArgumentException

3. Allow the US weight to be retrieved

Implement the WeighingMachine.USDisplayWeight property and the USWeight class:

var wm = new WeighingMachine();
wm.InputWeight = 60m;

var usw = wm.USDisplayWeight;
// => usw.Pounds == 132 && usw.Ounces == 4

4. Allow the machine's units to be set to pounds

Implement the WeighingMachine.Units property:

var wm = new WeighingMachine();
wm.InputWeight = 175.5m;
wm.Units = Units.Pounds;

var usw = wm.USDisplayWeight;
// => usw.Pounds == 175 && usw.Ounces == 8

5. Allow a tare adjustment to be applied to the weighing machine

Implement the WeighingMachine.TareAdjustment and WeighingMachine.DisplayWeight properties:

var wm = new WeighingMachine();
wm.InputWeight = 100m;
wm.TareAdjustment = 10m;

// => wm.DisplayWeight == 90m