Level 6 — Programming — Mar/Apr 2025 — Practical

Level 6 • March/April 2025 • Practical assessment

Work through each question before checking the answer. These revision answers are prepared for learners; they are not an official marking scheme.

Question 1

Task1: Implement parking entry/exit, capacity10, full/empty checks, a menu, count display and tests.

Answer

Save as ParkingLot.java.

import java.util.Scanner;
public class ParkingLot {
    public static void main(String[] args) {
        final int CAPACITY = 10;
        int cars = 0; boolean running = true;
        Scanner in = new Scanner(System.in);
        while (running) {
            System.out.println("1 Entry\n2 Car exit\n3 Status\n4 Quit");
            int choice;
            try { choice = Integer.parseInt(in.nextLine()); }
            catch (NumberFormatException ex) { System.out.println("Enter 1-4"); continue; }
            switch (choice) {
                case 1:
                    if (cars < CAPACITY) { cars++; System.out.println("Car added"); }
                    else System.out.println("Parking lot is full");
                    break;
                case 2:
                    if (cars > 0) { cars--; System.out.println("Car exited"); }
                    else System.out.println("Parking lot is empty");
                    break;
                case 3:
                    System.out.printf("Cars: %d; available spaces: %d%n", cars, CAPACITY-cars);
                    break;
                case 4: running = false; break;
                default: System.out.println("Enter 1-4");
            }
        }
    }
}
Test Expected
Exit when count0 Empty message; count stays0
10 successful entries Count10; available0
11th entry Full message; count stays10
Exit from10 Count9; available1
Invalid menu input No count change; prompt again

Question 2

Task2: Capture15 days of temperature,rainfall,humidity in arrays, calculate averages/total and recommend matching crops.

Answer

Crop Temperature°C Rainfallmm Humidity%
Rice 20–35 100–300 60–90
Wheat 10–25 50–100 40–60
Maize 18–27 60–150 50–70
Sugarcane 20–40 100–300 70–90

The introductory requirement says recommendations use total rainfall for15 days, while task4 asks for rainfall average. The solution calculates and displays both, and uses the total for the recommendation. Several crops can match; the paper gives no rule to rank them, so show all matches.

Save as CropRecommendation.java.

import java.util.Scanner;
public class CropRecommendation {
    static double read(Scanner in, String prompt, double min, double max) {
        while (true) {
            System.out.print(prompt);
            try {
                double value = Double.parseDouble(in.nextLine());
                if (Double.isFinite(value) && value >= min && value <= max) return value;
            } catch (NumberFormatException ex) { }
            System.out.println("Enter a finite value in the allowed range.");
        }
    }
    static boolean between(double x, double low, double high) { return x >= low && x <= high; }
    public static void main(String[] args) {
        final int DAYS = 15;
        double[] temperature = new double[DAYS], rainfall = new double[DAYS],
                 humidity = new double[DAYS];
        double totalTemp = 0, totalRain = 0, totalHumidity = 0;
        Scanner in = new Scanner(System.in);
        for (int day = 0; day < DAYS; day++) {
            System.out.println("Day " + (day + 1));
            temperature[day] = read(in, "Temperature C: ", -Double.MAX_VALUE, Double.MAX_VALUE);
            rainfall[day] = read(in, "Rainfall mm: ", 0, Double.MAX_VALUE);
            humidity[day] = read(in, "Humidity percent: ", 0, 100);
            totalTemp += temperature[day]; totalRain += rainfall[day];
            totalHumidity += humidity[day];
        }
        double averageTemp = totalTemp/DAYS, averageRain = totalRain/DAYS,
               averageHumidity = totalHumidity/DAYS;
        System.out.printf("Average temperature: %.2f C%nTotal rainfall: %.2f mm%nAverage rainfall: %.2f mm/day%nAverage humidity: %.2f%%%n",
                          averageTemp, totalRain, averageRain, averageHumidity);
        String[] crops = {"Rice", "Wheat", "Maize", "Sugarcane"};
        double[][] limits = {{20,35,100,300,60,90}, {10,25,50,100,40,60},
                             {18,27,60,150,50,70}, {20,40,100,300,70,90}};
        boolean found = false;
        for (int i = 0; i < crops.length; i++) {
            double[] r = limits[i];
            if (between(averageTemp,r[0],r[1]) && between(totalRain,r[2],r[3]) &&
                between(averageHumidity,r[4],r[5])) {
                System.out.println("Matching crop: " + crops[i]); found = true;
            }
        }
        if (!found) System.out.println("No crop matches all supplied conditions.");
    }
}
Step-by-step calculation

  1. Illustration: each of15 days has24°C,10mm rainfall and65% humidity.
  2. Temperature average=(15×24)/15=24°C; humidity average=(15×65)/15=65%.
  3. Total rainfall=15×10=150mm; daily average=150/15=10mm.
  4. 24°C,150mm total and65% fit both Rice and Maize in the supplied table. Wheat fails humidity; Sugarcane fails the70% minimum.

This implements the assessment table, rather than a full agronomic decision model. Test inclusive boundaries, no-match conditions, invalid humidity and all15 entries.

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