Solved BS-CS 2023 | GCUF

Solved BS-CS 7th Semester Exam Questions | GCUF

📘 Solved BS-CS 7th Semester Exam Questions
Fall 2023–2024
Govt. College University, Faisalabad
Program: BS Computer Science (7th Semester)

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📱 Mobile Application Development (CSI-601)

Q1: Layered Architecture of Android OS

Android follows a layered architecture, where each layer provides services to the layer above it:

• Linux Kernel: Manages hardware drivers, memory, processes, and security.
• Native Libraries: C/C++ libraries such as SQLite, OpenGL, and Media Framework.
• Android Runtime (ART): Executes applications using Ahead-of-Time compilation.
• Application Framework: Provides APIs like Activity Manager and Content Providers.
• Applications: User-installed and built-in apps.

Q2: What is an Activity? Explain Activity Life Cycle

An Activity represents a single screen with a user interface.

The life cycle includes stages such as onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy().

Q3: What is Event Handling in Android?

Event handling is the process by which Android responds to user actions such as clicks and touches.

1. User performs an action
2. Event object is generated
3. Listener captures the event
4. Callback method executes

Q4: Program to Find Power of a Number (Java)

import java.util.Scanner; 

public class Power { 
    public static void main(String[] args) { 
        Scanner sc = new Scanner(System.in); 
        System.out.print("Enter base: "); 
        int base = sc.nextInt(); 
        System.out.print("Enter exponent: "); 
        int exp = sc.nextInt(); 
        int result = 1; 
        for(int i = 1; i <= exp; i++) { 
            result *= base; 
        } 
        System.out.println("Result: " + result); 
    } 
}
    

Q5: What is an Intent?

An Intent is a messaging object used to request an action from another component.

• Explicit Intent: Used to start a specific activity.
• Implicit Intent: Used when the system chooses the component based on action.

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⚙️ Parallel & Distributed Computing (CSI-605)

Q2: Shared Memory Multiprocessor System

In this system, multiple processors share a common memory and communicate through shared variables.

Q3: Advantages & Disadvantages of Parallel Computers

• Advantages: High performance, fast execution, and efficient resource utilization.
• Disadvantages: Complex programming, high cost, and synchronization overhead.

Q4-Q5: Message-Passing Multi-computer Systems

Each processor has its own memory and communicates using send and receive messages.

Q6: Distributed Shared Memory (DSM)

DSM provides the illusion of shared memory in distributed systems.

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🧠 Compiler Construction (CSI-501)

Q2 & Q4: Parsing Tables

The exam requires constructing CLR and LL(1) parsing tables for specific context-free grammars.

Q3: Phases of a Compiler

The compiler process is divided into several logical phases:

1. Lexical Analysis
2. Syntax Analysis
3. Semantic Analysis
4. Intermediate Code Generation
5. Code Optimization
6. Code Generation

Q5: Ambiguous vs Unambiguous Grammar

• Ambiguous Grammar: A grammar that produces more than one parse tree for the same string.
• Unambiguous Grammar: A grammar that produces exactly one parse tree for each string.

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