University of Sargodha Main Campus
Department of Software Engeering
Course Code: SECC301 Software Construction And Development Time: 90 minutes
Class:BSSE 5TH (Mid-Term) Date: 27/10/2024
Total Marks: 30
Answer the following short questions. (5x2=10)
Q1) How COTS components impact the software construction process?
Q2) Write a program to multiply 15 by 3 using bit manipulation instead of the multiplication operator .
Q3) Differentiate between the Adapter and Facade design patterns, how each pattern interacts with interfaces.
Q4) Why should system-level design avoid circular class dependencies, and which principle/ rule is applied to
eliminate them?
Q5) Give for each three examples for routine , class and package interface level abstraction.
Answer the following long questions. (2x10)
Q6) Fill the table with at least 10 distinct tests cases for the vulnerable program given below; for each case
indicate result/output (Crash / Wrong output / SQL injection / Other), cause (1–3 words), and one-line
solution/fix. Table format given below
import sqlite3
total_input = input()
quantity_input = input()
username_input = input()
total = int(total_input)
quantity = int(quantity_input)
print(total / quantity)
print(total + username_input)
conn = sqlite3.connect(":memory:")
cur = conn.cursor()
cur.execute("CREATE TABLE users(id, username)")
cur.execute("INSERT INTO users VALUES (1, 'alice')")
query = "SELECT * FROM users WHERE username = '" + username_input + "';"
print(query)
No # Test Input (total, qty, username) Result /output Cause Suggested
Fix
Q(7) A software company is developing a popular E-Commerce Platform that manages products,
customers, orders, payments, and secure user login. The first prototype has become difficult to
maintain—small changes in one module break other parts of the system, internal data is accessed
directly, and many components are tightly coupled. Since the platform must later support mobile apps,
multiple payment gateways, AI-based recommendations, and third-party integrations, the system
design now requires major improvement. Explain in detail which heuristic design approaches can
help redesign this e-commerce platform to improve its flexibility, scalability, and long-term
maintainability.
