Complete set: Intro to C - Bill Buchanan

5.15 Methods Tutorial
We return to the Megalomania solution for this tutorial. We will be creating methods
to process the Country class. In each case we should create methods in the
Country.cs file and call them from the interface.
13) Create routines to increment the population as in the lecture notes.
a) Create a button that increments the population of country index 5. Implement
IncPop so that the following code can be attached to a new button on the
form:
Country target = ((Country)world[5]);
target.IncPop(1000000);
You should notice the population of Angola go from about 10 million to
about 11 million.
b) Create the method Annex – this country adds in all of the population, area and
gdp of the victim country. The victim country still exists but with an area,
population and gdp of zero. Attach the following code to a new button and
observe what happens to Jersey and the Isle of Man.
private void button2_Click(object sender, System.EventArgs e)
{
Country uk = (Country) world[248];
Country jersey = (Country)world[121];
Country iom = (Country)world[150];
uk.Annex(jersey);
uk.Annex(iom);
}
duction to .NET
Intro
c) Create the + operator (See chapter 6 of Jesse Liberty). This is operator creates a
new country with the combined population, gdp and area of the two participants.
The name of the new country should be set to “New Country”. The
region should be set – if the two countries are in different regions an exception
should be raised. Create a button to unite North and South Korea with
the following code:
private void button3_Click(object sender, System.EventArgs e)
{
Country northKorea = (Country)world[129];
Country southKorea = (Country)world[130];
world.Add(northKorea+southKorea);
}
d) You should find the new country at the bottom of the list.
Agilent .NET Course: Module 5, page
15