// convert following program from JAVA TO C++

import java.util.Queue; import java.util.Scanner; import java.util.concurrent.LinkedBlockingQueue;

public class AirportSimulation { public static boolean isPlaneComingIntoQueue(int avgInterval){ if(Math.random() < (1.0 / avgInterval)) return true; else return false; } public static boolean isPlaneCrashed(int in, int out, int interval){ if(out - in > interval){ return true; } else{ return false; } } public static void main(String[] args){ Scanner in = new Scanner(System.in); System.out.print("The amount of time needed for one plane to land: "); int landTime = in.nextInt(); System.out.print("the amount of time needed for one plane to take off: "); int takeoffTime = in.nextInt(); System.out.print("the average amount of time between arrival of planes to the landing queue: "); int avgArrivalInterval = in.nextInt(); System.out.print("the average amount of time between arrival of planes to the takeoff queue: "); int avgDepartureInterval = in.nextInt(); System.out.print("the maximum amount of time that a plane can stay in the landing queue without running out of fuel and crashing: "); int crashLimit = in.nextInt(); System.out.print("the total length of time to be simulated: "); int totalTime = in.nextInt(); int totalTimeSpentInLandingQueue = 0, totalTimeSpentInTakeoffQueue = 0; int numPlanesLanded = 0, numPlanesTookoff = 0; int numPlanesCrashed = 0; Queue landingQueue = new LinkedBlockingQueue(); Queue takeoffQueue = new LinkedBlockingQueue(); for(int i = 0; i < totalTime; ++i){ if(isPlaneComingIntoQueue(avgArrivalInterval)){ landingQueue.add(i); } if(isPlaneComingIntoQueue(avgDepartureInterval)){ takeoffQueue.add(i); } while(true){ while(!landingQueue.isEmpty() && isPlaneCrashed(landingQueue.peek(), i, crashLimit)){ landingQueue.remove(); numPlanesCrashed++; } if(!landingQueue.isEmpty()){ int nextPlane = landingQueue.peek(); landingQueue.remove(); numPlanesLanded++; totalTimeSpentInLandingQueue += (i - nextPlane); int j; for(j = i; j < landTime + i && j < totalTime; ++j){ if(isPlaneComingIntoQueue(avgArrivalInterval)){ landingQueue.add(j); } if(isPlaneComingIntoQueue(avgDepartureInterval)){ takeoffQueue.add(j); } } i = j; if(i >= totalTime){ break; } } else{ break; } } if(!takeoffQueue.isEmpty()){ int nextPlane = takeoffQueue.peek(); takeoffQueue.remove(); numPlanesTookoff++; totalTimeSpentInTakeoffQueue += (i - nextPlane); int j; for(j = i; j < takeoffTime + i && j < totalTime; ++j){ if(isPlaneComingIntoQueue(avgArrivalInterval)){ landingQueue.add(j); } if(isPlaneComingIntoQueue(avgDepartureInterval)){ takeoffQueue.add(j); } } i = j; } } while(!landingQueue.isEmpty() && isPlaneCrashed(landingQueue.peek(), totalTime, crashLimit)){ landingQueue.remove(); numPlanesCrashed++; } System.out.println("The number of planes that took off in the simulated time is " + numPlanesTookoff); System.out.println("the number of planes that landed in the simulated time is " + numPlanesLanded); System.out.println("the number of planes that crashed because they ran out of fuel before they could land is " + numPlanesCrashed); System.out.println("the average time that a plane spent in the takeoff queue is " + totalTimeSpentInTakeoffQueue / (double)numPlanesTookoff); System.out.println("the average time that a plane spent in the landing queue is " + totalTimeSpentInLandingQueue / (double)numPlanesLanded); } }

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// the outcome should look like this :

The amount of time needed for one plane to land: 3 the amount of time needed for one plane to take off: 2 the average amount of time between arrival of planes to the landing queue: 4 the average amount of time between arrival of planes to the takeoff queue: 3 the maximum amount of time that a plane can stay in the landing queue without running out of fuel and crashing: 5 the total length of time to be simulated: 100 The number of planes that took off in the simulated time is 10 the number of planes that landed in the simulated time is 24 the number of planes that crashed because they ran out of fuel before they could land is 2 the average time that a plane spent in the takeoff queue is 36.8 the average time that a plane spent in the landing queue is 2.6666666666666665