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Published at Dec 22 2020
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Instructions

Test suite

Solution

Given an age in seconds, calculate how old someone would be on:

- Mercury: orbital period 0.2408467 Earth years
- Venus: orbital period 0.61519726 Earth years
- Earth: orbital period 1.0 Earth years, 365.25 Earth days, or 31557600 seconds
- Mars: orbital period 1.8808158 Earth years
- Jupiter: orbital period 11.862615 Earth years
- Saturn: orbital period 29.447498 Earth years
- Uranus: orbital period 84.016846 Earth years
- Neptune: orbital period 164.79132 Earth years

So if you were told someone were 1,000,000,000 seconds old, you should be able to say that they're 31.69 Earth-years old.

If you're wondering why Pluto didn't make the cut, go watch this youtube video.

In order to run the tests for this track, you will need to install DUnitX. Please see the installation instructions for more information.

If Delphi is properly installed, and `*.dpr`

file types have been associated with Delphi, then double clicking the supplied `*.dpr`

file will start Delphi and load the exercise/project. `control + F9`

is the keyboard shortcut to compile the project or pressing `F9`

will compile and run the project.

Alternatively you may opt to start Delphi and load your project via. the `File`

drop down menu.

We monitor the Pascal-Delphi support room on gitter.im to help you with any questions that might arise.

Note that, when trying to submit an exercise, make sure the exercise file you're submitting is in the `exercism/delphi/<exerciseName>`

directory.

For example, if you're submitting `ubob.pas`

for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/delphi/bob/ubob.pas`

.

Partially inspired by Chapter 1 in Chris Pine's online Learn to Program tutorial. http://pine.fm/LearnToProgram/?Chapter=01

It's possible to submit an incomplete solution so you may request help from a mentor.

```
unit uSpaceAgeTests;
interface
uses
DUnitX.TestFramework;
const
CanonicalVersion = '1.2.0';
type
[TestFixture]
SpaceAgeTests = class(TObject)
public
[Test]
// [Ignore('Comment the "[Ignore]" statement to run the test')]
procedure Age_on_earth;
[Test]
[Ignore]
procedure Age_on_mercury;
[Test]
[Ignore]
procedure Age_on_venus;
[Test]
[Ignore]
procedure Age_on_mars;
[Test]
[Ignore]
procedure Age_on_jupiter;
[Test]
[Ignore]
procedure Age_on_saturn;
[Test]
[Ignore]
procedure Age_on_uranus;
[Test]
[Ignore]
procedure Age_on_neptune;
end;
implementation
uses uSpaceAge;
{ SpaceAgeTests }
procedure SpaceAgeTests.Age_on_earth;
var
MyAge: ISpaceAge;
expectedAge: double;
begin
MyAge := NewSpaceAge(1000000000);
expectedAge := 31.69;
Assert.AreEqual(expectedAge, MyAge.OnEarth);
end;
procedure SpaceAgeTests.Age_on_jupiter;
var
MyAge: ISpaceAge;
expectedAge: double;
begin
MyAge := NewSpaceAge(901876382);
expectedAge := 2.41;
Assert.AreEqual(expectedAge, MyAge.OnJupiter);
end;
procedure SpaceAgeTests.Age_on_mars;
var
MyAge: ISpaceAge;
expectedAge: double;
begin
MyAge := NewSpaceAge(2129871239);
expectedAge := 35.88;
Assert.AreEqual(expectedAge, MyAge.OnMars);
end;
procedure SpaceAgeTests.Age_on_mercury;
var
MyAge: ISpaceAge;
expectedAge: double;
begin
MyAge := NewSpaceAge(2134835688);
expectedAge := 280.88;
Assert.AreEqual(expectedAge, MyAge.OnMercury);
end;
procedure SpaceAgeTests.Age_on_neptune;
var
MyAge: ISpaceAge;
expectedAge: double;
begin
MyAge := NewSpaceAge(1821023456);
expectedAge := 0.35;
Assert.AreEqual(expectedAge, MyAge.OnNeptune);
end;
procedure SpaceAgeTests.Age_on_saturn;
var
MyAge: ISpaceAge;
expectedAge: double;
begin
MyAge := NewSpaceAge(2000000000);
expectedAge := 2.15;
Assert.AreEqual(expectedAge, MyAge.OnSaturn);
end;
procedure SpaceAgeTests.Age_on_uranus;
var
MyAge: ISpaceAge;
expectedAge: double;
begin
MyAge := NewSpaceAge(1210123456);
expectedAge := 0.46;
Assert.AreEqual(expectedAge, MyAge.OnUranus);
end;
procedure SpaceAgeTests.Age_on_venus;
var
MyAge: ISpaceAge;
expectedAge: double;
begin
MyAge := NewSpaceAge(189839836);
expectedAge := 9.78;
Assert.AreEqual(expectedAge, MyAge.OnVenus);
end;
initialization
TDUnitX.RegisterTestFixture(SpaceAgeTests);
end.
```

```
unit uSpaceAge;
interface
type
ISpaceAge = interface(IInterface)
function OnMercury(): double;
function OnVenus(): double;
function OnEarth(): double;
function OnMars(): double;
function OnSaturn(): double;
function OnJupiter(): double;
function OnNeptune(): double;
function OnUranus(): double;
end;
TSpaceAge = class(TInterfacedObject, ISpaceAge)
var fTime:double;
var fEarthYears:double;
constructor Create(aTime:double);
function OnMercury(): double;
function OnVenus(): double;
function OnEarth(): double;
function OnMars(): double;
function OnSaturn(): double;
function OnJupiter(): double;
function OnNeptune(): double;
function OnUranus(): double;
end;
function NewSpaceAge(const APeriod:Double):ISpaceAge;
implementation
{ TSpaceAge }
uses Math;
constructor TSpaceAge.Create(aTime: double);
begin
fTime:=aTime;
fEarthYears:=fTime/31557600;
end;
function TSpaceAge.OnEarth(): double;
begin
result:=Math.RoundTo(fEarthYears,-2);
end;
function TSpaceAge.OnJupiter: double;
begin
result:=Math.RoundTo(fEarthYears / 11.862615,-2);
end;
function TSpaceAge.OnMars: double;
begin
result:=Math.RoundTo(fEarthYears / 1.8808158,-2);
end;
function TSpaceAge.OnMercury: double;
begin
result:=Math.RoundTo(fEarthYears / 0.2408467,-2);
end;
function TSpaceAge.OnNeptune: double;
begin
result:=Math.RoundTo(fEarthYears / 164.79132,-2);
end;
function TSpaceAge.OnSaturn: double;
begin
result:=Math.RoundTo(fEarthYears / 29.447498,-2);
end;
function TSpaceAge.OnUranus: double;
begin
result:=Math.RoundTo(fEarthYears / 84.016846,-2);
end;
function TSpaceAge.OnVenus: double;
begin
result:=Math.RoundTo(fEarthYears / 0.61519726,-2);
end;
function NewSpaceAge(const APeriod:Double):ISpaceAge;
begin
result:=TSpaceAge.Create(APeriod);
end;
end.
```

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