IB Computer Science D.2 Features of OOP Questionbank

An e-commerce platform is designing a shopping cart system with classes like Product, Electronic, and Clothing. The Electronic and Clothing classes inherit from the Product class.

(a) Define the term polymorphism.

(b) Explain one advantage of polymorphism in this shopping cart system.

(c) Explain two advantages of encapsulation in this context.

A software engineer is developing an inventory management system for a warehouse. To find specific items quickly, the engineer is implementing a search module. The initial version of the search function is shown below:

public int linearSearch(String[] inventory, String target)
{
    int index = -1;
    for (int i = 0; i < inventory.length; i++) {
        if (inventory[i].equals(target)) {
            index = i;
        }
    }
    return index;
}

The warehouse currently stores thousands of items. The engineer is considering ways to optimize the search process and ensure the software is easy to maintain for future developers who might work on the system.

(a) Outline one advantage of using modular sub-programs (methods or functions) in a large software project.

(b) Describe two ways in which a syntax error differs from a logical error during the development process.

(c) State the appropriate data type for the target parameter in the linearSearch function.

(d) State the appropriate data type to be used for a variable that stores the total quantity of a specific item in stock.

A software company is developing a Hospital Management System that includes classes such as Employee, Doctor, and Nurse. Both Doctor and Nurse inherit from the Employee class.

(a) Define the term inheritance.

(b) Explain one advantage of using inheritance in this Hospital Management System.

(c) Describe two advantages of using libraries of objects in developing this system.

The following method, calcBMI() accepts person's height (H) in metres (m) and weight (W) in kilograms (kg) and returns their Body Mass Index (BMI).

calcBMI(H, W) X = H * H B = W / X return B end calcBMI

Boris weighs 104 kg and is 2.00 m tall. His BMI can be calculated by calling method calcBMI() as follows

BorisBMI = calcBMI(2.00, 104).

A person can belong to one of the following four weight categories:

The data about a group of adults and their height measurement (in metres) and weight measurement (in kg) is held in three one-dimensional arrays.

Where NAME is a one-dimensional array holding names (currently sorted in alphabetical order). WEIGHT is a one-dimensional array holding weight measurement in kilograms. HEIGHT is a one-dimensional array holding height measurement in metres.

For example, NAME [0] is Annie. Her weight measurement is 52.40 kg and can be found in WEIGHT [0]. HEIGHT [0] is 1.56 which represents Annie's height measurement in metres.

(a) State the value of variable BorisBMI.

(b) Use pseudocode to construct an algorithm which accepts a person's BMI and outputs the weight category the person belongs to.

(c) State the name of the person whose height is held in HEIGHT [3].

(d) Identify one reason why a binary search algorithm cannot be used to find the name of person whose height is given.