PHP:Accumulate over a File
You may find the page on accumulating variables useful:
How many countries in Asia?
In this example we use an accumulator to count the countries in Africa.
acc shows up three times:
- The accumulator
accis set to zero at the start.
- Every time we encounter Africa we increment
- After the loop has completed
acccontains the value we want - so we print it.
Change the program so that it counts the countries of Asia.
How many big countries?
Count the number of countries with an area of more than 1500000.
Produce a numbered list of countries:
1 Afghanistan 2 Albania 3 Algeria ... 262 Zimbabwe
Use three character spaces for the number and put a single space after it.
Country number 42.
Print the name of country number 42
Calculate the total area of the world.
This time we add to the accumulator each time. We can use either of the statements below:
$acc = $acc + $area;
$acc += $area;
Calculate the total population of the world.
Total GDP of Africa
Calculate the total GDP of the countries of Africa.
Total GDP of the 'West'.
Calculate the total GDP of the western world. Include the regions "North America", "Europe" and "Oceania" as the western world.