Fundamentals of Web Design - Assignment 4

Overview

This repository contains solutions to all 6 questions of Assignment 4 using plain JavaScript.
All inputs are taken using prompt() and outputs are displayed using alert() as required.

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File Structure

• q1.html → Digit Gatekeeper
• q2.html → Roll-Seed Lock
• q3.html → Mirror Corridor
• q4.html → Fare Calculator
• q5.html → Skipping Numbers
• q6.html → Contest Score Judge

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Approach (Question-wise)

Question 1: Digit Gatekeeper

• Loop through all numbers from L to R
• Check divisibility by K
• Ensure number does not contain digit 0
• Calculate sum of digits and check if it is prime

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Question 2: Roll-Seed Lock

• Perform 3 transformations:
  • If even → divide by 2 and add seed
  • If odd → multiply by 3 and subtract seed
• Check:
  • Final number is 3-digit
  • Middle digit equals seed

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Question 3: Mirror Corridor

• Iterate from X = 0 to 100000
• Check if:
  • N + X is palindrome
  • N + X is divisible by K
• Return smallest valid X

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Question 4: Fare Calculator

• Calculate base fare
• Apply conditions:
  • Late penalty
  • Distance surcharge
  • Seed adjustment
• Round result to nearest multiple of 5

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Question 5: Skipping Numbers

• Add numbers from 1 onwards
• Skip numbers divisible by (seed + 2)
• Stop when sum ≥ N

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Question 6: Contest Score Judge

• Compute score using formula:
  • score = 3a + b - 2c
• Apply:
  • Negative → set to 0
  • Penalty if total submissions > 50
• Determine PASS or FAIL

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Concepts Used

• Loops (for, while)
• Conditional statements (if-else)
• Functions
• String manipulation
• Math operations
• JavaScript built-in methods

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Time Complexity

• Most problems run in O(n) time
• Efficient for given constraints (up to 10⁶)

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How to Run

1. Open any .html file in a browser
2. Enter inputs when prompted
3. Output will be shown using alert

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Notes

• No hardcoding is used
• All inputs are dynamic
• Follows assignment instructions strictly

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Author

Akanksha