ProgZoo Accumulating values.

1. Old Europe.

Prior to 2004 the members of the European Union were

Austria Belgium Denmark Finland France Germany Greece Ireland Italy Luxembourg Netherlands Portugal Spain Sweden United Kingdom

Use an accumulating parameter to calculate the total area of old Europe

Array of old Europe

We can represent these strings in an array:

String [] oldEU = {"Austria","Belgium" ,"Denmark" ,"Finland"
                  ,"France" ,"Germany" ,"Greece" ,"Ireland"
                  ,"Italy" ,"Luxembourg" ,"Netherlands" ,"Portugal"
                  ,"Spain" ,"Sweden" ,"United Kingdom"};

The answer

int totArea = 0;
for (String s:oldEU)
  totArea += world.get(s).area;
System.out.println(totArea);

test text

2. New Europe.

In 2004 the following ten countries joined the EU

Cyprus, Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, Slovenia

Calculate the total area of Europe including new and old.

String [] newEU = {"Cyprus", "Czech Republic", "Estonia",
                   "Hungary", "Latvia", "Lithuania", "Malta",
                   "Poland", "Slovakia", "Slovenia"};

test text

3. Old and New Europe.

static void doStuff(TreeMap<String,Country> world)
{
  String [] oldEU = {"Austria","Belgium" ,"Denmark" ,"Finland"
                  ,"France" ,"Germany" ,"Greece" ,"Ireland"
                  ,"Italy" ,"Luxembourg" ,"Netherlands" ,"Portugal"
                  ,"Spain" ,"Sweden" ,"United Kingdom"};
  String [] newEU = {"Cyprus", "Czech Republic", "Estonia",
                     "Hungary", "Latvia", "Lithuania", "Malta",
                     "Poland", "Slovakia", "Slovenia"};

//Initialise all accumulating parameters.
  int oldArea = 0;
  long oldPop = 0;
  long oldGDP = 0;
  int newArea = 0;
  long newPop = 0;
  long newGDP = 0;

for (String s:oldEU)
  {
    Country c = world.get(s);
    oldArea += c.area;
    oldGDP += c.gdp;
  }
  for (String s:newEU)
  {
    Country c = world.get(s);
    newArea += c.area;
    newPop += c.pop;
    newGDP += c.pop;
  }
  System.out.printf("Area\told%3d\tnew%3d\n",
             100*oldArea/(oldArea+newArea),
             100*newArea/(oldArea+newArea));
  System.out.printf("Pop\told%3d\tnew%3d\n",
             100*oldPop/(oldPop+newPop),
             100*newPop/(oldPop+newPop));
  System.out.printf("GDP\told%3d\tnew%3d\n",
             100*oldGDP/(oldGDP+newGDP),
             100*newGDP/(oldGDP+newGDP));
}

Calculate the percentage of Europe that is old or new. Do this for area, population and GDP.

This is a debugging exercise. Most of the program is correct but there a couple of mistakes in the given answer.

Error one

Error two

test text

4. G8

The G8 summit in 2005 included Canada, France, Germany, Italy, Japan, Russia, United Kingdom and United States.

Calculate the total GDP for these countries and the total GDP for the planet. Print the GDP of the G8 as a percentage of World GDP.

Percentages

Declare g8GDP and worldGDP as long and calculate them.

System.out.println(100*g8GDP/worldGDP);

G8 as a list

You don't need to do it this way but to save you typing you may use:

     String [] g8 = new String[]{"Canada","France","Germany","Italy",
                   "Japan","Russia","United Kingdom","United States"};

test text

5. Guessing the median population.

We speculate that Mauritania has the median population. If that is the case then the number of countries with a population higher is exactly the same as the number of countries with a smaller population.

Print the number of countries smaller and the number of countries bigger than Mauritania. Do not count countries with exactly the same population.

test text

A Gentle Introduction to
Java Programming

Tutorial: Accumulating values.

1. Old Europe.

2. New Europe.

3. Old and New Europe.

4. G8

5. Guessing the median population.

A Gentle Introduction to Java Programming

Tutorial: Accumulating values.

1. Old Europe.

2. New Europe.

3. Old and New Europe.

4. G8

5. Guessing the median population.

A Gentle Introduction to
Java Programming