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Analysing a problem - how long a train?
Analysing a Programming Task example from a Well House Consultants training course
More on Analysing a Programming Task [link]
Source code: Trainlength.java Module: Q904
public class Trainlength {
/* Problem ... you have "x" people to transport home from a day out in Weymouth by train. The train is from 1 to 5 carriages in length, and you're asked to provide 5 seats for every 4 people if you can. Each carriage can seat 75 people. */ /* Method - start with 1 carriage and work out the loading ... if it's greater that 4/5 (0.8) add another carriage and work out the loading again. Keep going until you have plenty of seats, or until you've got 5 carriages so can't run any longer (short platform, Freshford). */ /* It's part of the programmers skills to pick out the irrelevant (the fact that Freshford is a problem) from the relevant ;-) */ public static void main (String[] args) { // Initial stuff int cars = 0; int passengers = 250; int ppc = 75; float loading = 99.0f; // Stuff which you do for each possible length while (cars < 5 && loading > 0.8f) { cars += 1; loading = (float)passengers / (float)(ppc * cars); System.out.println("With "+cars+" cars, loading is "+loading); } // Stuff you do once at the end System.out.println("Have a great day in Weymouth"); } } /* Running that program ... munchkin:jj11 grahamellis$ java Trainlength With 1 cars, loading is 3.3333333 With 2 cars, loading is 1.6666666 With 3 cars, loading is 1.1111112 With 4 cars, loading is 0.8333333 With 5 cars, loading is 0.6666667 Have a great day in Weymouth munchkin:jj11 grahamellis$ */ Learn about this subject
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