DEVELOPING PROBLEM-SOLVING SKILLS- COMPUTER JAMB & WAEC GUIDE KEYPOINTS

April 8, 2026 Be first to comment Daniel DTW Tutor

CHAPTER 10: DEVELOPING PROBLEM-SOLVING SKILLS

10.1 PROGRAMMING LANGUAGES

  • Definition: An artificial language with a set of specific rules and symbols used to write a sequence of instructions (a program) for a computer.
  • Levels:
    1. Machine Language (First Generation): Uses only binary code (0s and 1s). It is the only language directly understood by the CPU. Fastest execution, but extremely difficult to write and debug. Machine-dependent.
    2. Low-level Language (Assembly Language – Second Generation): Uses mnemonics (short codes like ADD, SUB) instead of binary. Must be translated by an Assembler. Slightly easier than machine code but still machine-dependent.
    3. High-level Language (Third Generation+): Resembles human language (English) and mathematics.66 Must be translated by a Compiler or Interpreter. Machine-independent, easy to learn and write. (BASIC, C++, Python).

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10.2 HIGH-LEVEL LANGUAGES

  • Definition: Programming languages designed to be easy to read, write, and maintain, closely resembling human language.
  • Classification: Scientific (FORTRAN, MATLAB), Business (COBOL), Artificial Intelligence (Prolog, LISP), System (C), Web (Java, JavaScript).
  • Features of BASIC: Simple, easy to learn, interactive, often used for teaching.
  • Features of C/Pascal: Highly structured, efficient for systems programming and fast execution.
  • Other languages: Java (platform-independent due to Java Virtual Machine), Python (versatile, popular for data science and AI).

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10.3 ALGORITHM AND FLOWCHART

  • Algorithm: A finite, ordered sequence of unambiguous steps that describe a method for solving a problem or performing a task.
  • Functions of Algorithm: Clarity in problem-solving, easy conversion to code.
  • Flowchart: A graphical representation of an algorithm or program logic using standard symbols connected by flow lines.
  • Flowchart Symbols:
    • Start/End (Oval): Marks the beginning and end of the program.
    • Process (Rectangle): Represents a calculation or data manipulation step.
    • Decision (Diamond): Represents a point where a choice or comparison is made (Yes/No).
    • Input/Output (Parallelogram): Represents reading data or displaying results.
    • Flow Line (Arrow): Shows the direction of control flow.
    • Connector (Small Circle): Used to connect parts of a flowchart on the same page.
  • Functions of Flowchart: Provides a visual structure, aids in debugging, and serves as program documentation.

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10.4 BASIC PROGRAMMING

  • Meaning of BASIC: Beginner’s All-purpose Symbolic Instruction Code.
  • Characteristics: Simple, interactive, uses line numbers (in traditional versions).
  • Data Types: Numeric (Integer, Real/Single), String (Alphanumeric data enclosed in quotes).
  • BASIC Statements: LET (Assignment), INPUT (User input), PRINT (Output), IF…THEN (Decision), FOR…NEXT (Counted loop), GOTO (Unconditional jump).
  • Arithmetic Operators (Order of Evaluation): 1. Exponentiation (^); 2. Multiplication/Division (*, /); 3. Addition/Subtraction (+, -).
  • Built-in Functions: Predefined routines for common operations (e.g., SQR() for square root, INT() for integer part).
  • Arrays: A set of memory locations referenced by a single variable name and an index/subscript. Used to store and process a list of related data (e.g., student scores).

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10.5 SYSTEM DEVELOPMENT CYCLE (SDC)

  • Definition: A structured approach used in systems engineering to plan, design, create, test, and deploy an information system.
  • Stages (Phases):
    1. Preliminary Study/Feasibility Study: Defines the problem, sets the scope, and determines if the project is feasible (technically, economically, operationally).
    2. System Analysis: Detailed study of the current system; determines user requirements and specifications for the new system.
    3. System Design: Develops the blueprint for the new system (inputs, outputs, database structure, security features).
    4. Implementation/Coding: The actual writing of the program code based on the design specifications.
    5. Testing: Checking for errors (bugs) and ensuring the system meets the user requirements.
    6. Conversion: Switching over from the old system to the new one (e.g., direct cutover, parallel running).
    7. Maintenance: Ongoing process of correcting errors, making enhancements, and adapting the system to new requirements.

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10.6 PROGRAM DEVELOPMENT CYCLE

  • Definition of Program: A finite set of instructions written in a programming language that specifies the sequence of operations a computer must perform to solve a problem.
  • Steps:
    1. Definition of Problem: Clearly understand the objective and requirements.
    2. Analysis: Determine inputs, processes, and required outputs.
    3. Algorithm/Flowcharting: Develop the step-by-step logic (algorithm) or graphical representation (flowchart).
    4. Coding: Write the program using a chosen programming language.
    5. Testing/Debugging: Run the program with test data to find and correct errors (bugs).
    6. Documentation: Writing manuals and comments for users and future programmers.
  • Interpreted vs Compiled Programs:
  • Compiled: The entire source code is translated once into machine code before execution, resulting in a standalone executable file that runs quickly.
  • Interpreted: The source code is translated and executed line-by-line each time the program runs, making execution slower but debugging easier.

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