Neco 2020 Computer Studies Question 4

Practice essay / theory question 4 from the 2020 Neco Computer Studies examination. This question covers Number systems, ASCII code, Data storage and binary representation, Data compression concepts .

Neco 2020 Computer Studies Essay / Theory
Topics: Number systems ASCII code Data storage and binary representation Data compression concepts
Question 4 NECO • 2020 • COMPUTER_STUDIES • essay

A small company keeps its employee information in a computer system. Each employee record contains the following fields: - Employee ID (a 4‑digit numeric code, e.g., 0234) - Name (stored as ASCII characters, maximum 20 characters) - Salary (stored as a 32‑bit signed integer representing Naira per month) The system is being upgraded to improve storage efficiency. Answer the questions below.

Question Parts

( a )
Convert the decimal number 156 to an 8‑bit binary number. Show each step of the conversion process.
( b )
The character ‘A’ is stored using the ASCII code. Provide its 8‑bit binary representation and explain how it would be stored in the Name field of the employee record.
( c )
Determine the minimum number of bits required to store any possible 4‑digit employee ID (0000 to 9999) without using a sign bit. Show the calculation.
( d )
The company is considering using Huffman coding to compress the employee names field. Briefly describe the principle of Huffman coding and give one advantage and one limitation of applying it to this field.

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About This Question

This is Neco 2020 Computer Studies Question 4. It is one of the essay questions from the 2020 Neco Computer Studies examination.

The question covers Number systems, ASCII code, Data storage and binary representation, Data compression concepts .

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