coding#6

Nested Loops and Programming Concepts

Introduction

• Lecturers: Ms Marinda Taljaard, Ms Isabelle Taljaard, Mr Ighsaan Salie

• Understanding programming involves key steps to be followed systematically.

Programming Thought Process

• Information Gathering:

  • What information is at hand?

  • Variables (categories: types, constants, initialized, declared, user input)

  • What results are needed?

  • Required outputs and their display formats.

  • How to process the data from input to output?

  • Planning the solution involves applying formulas, logical expressions, loops, and their order.

  • How to implement the code?

  • Writing the solution involves adhering to syntax rules.

  • Is the code functioning correctly?

  • Conduct testing with various input data.

Practical 4 Overview

• Discussion Points:

  • A breakdown of tasks over the following slides.

  • Various scenarios employed in practical sessions; individual solutions may differ yet still be correct.

Task 2 - Switch Statement Requirements

• Requires a switch statement with:

  • Case Labels for each valid option.

  • Default Case Label for handling invalid options.

Task 1 - Output Message Format

• Importance of adhering to specific formats for output messages.

Practical 4 Instructions and Looping Structures

Looping Constructs

• Repeating Instructions:

  • Instructions can be repeated via loops.

• Types of Loop Structures:

  • For Statement

  • While Statement

  • Do Statement: also known as do…while statement.

  • Nested Loops: an advanced loop where one loop runs inside another.

• Considerations When Looping:

  • Selection of the appropriate looping structure.

  • Statements to be executed inside the loop versus those outside it (before/after).

  • Be cautious to prevent infinite loops.

Nested Loops

• Characteristics of Nested Loops:

  • Can have multiple combinations (e.g., while-in-while, for-in-for, etc.).

  • Each loop is defined as:

  • Outer Loop: the primary loop that controls the set of iterations.

  • Inner Loop: contained within the outer loop, performing tasks for each iteration of the outer loop.

• Considerations for Nested Loops:

  • Determining play of control by outer and inner loops.

  • Deciding which operations are part of the outer loop versus the inner loop.

Example Implementation

Creating a Table with Nested Loops

• Goal: Create a table with 3 rows and 5 columns using nested loops.

  • Control Mechanics:

  • Outer loop: manages rows (one iteration per row).

  • Inner loop: controls column display for each row.

  • Example Output Structure:

  • Rows and columns constructed one-by-one with content displayed consolidated side-by-side per row twelve till last column.

Example Explanation

• After completion of the inner loop:

  • The command WriteLine ends the current row after displaying its contents, triggering a new line for the next row.

• The process continues incrementally through the rows until complete.

Homework Assignments

Homework Problem 1

• Task: Use nested loops to display the following pattern:

  • 
    1 12 123 1234 12345

• **Queries to Consider: **

  • Number of rows?

  • Number of columns?

  • Method for generating rows with increasing column counts?

Homework Problem 2

• Task Overview:

  • Develop a program for 5 students to:

  • Read 3 valid grades (0 to 100) per student with accurate prompts.

  • Calculate and display the highest mark for each student and overall highest mark in the class.

• Planning Steps:

  • Use an outer loop for the student count.

  • Implement an inner loop to capture three marks for each student.

  • Prompting user for valid entries; re-prompt if invalid marks are entered.

• Considerations:

  • Determine where to compute per-student highest marks and overall highest class mark.

  • Properly initializing necessary variables and ensuring efficient data handling within loops.

Module To-Do List

• Upcoming Tasks:

  • Review video materials available on the module site for Week 06, focusing on nested loops.

  • Complete Homework Problem 1 and 2 prior to the ensuing lecture.

  • Understand the outlined process for the impending semester test (a detailed breakdown is provided earlier).

  • Slot booking for the semester test on 20 March (open from 11 March to 18 March at 14:00).

  • Provide module feedback through the Google form shared in the Week 06 section.

  • Address any questions regarding the session topics.

Conclusion

• Final Remarks:

• A reminder to consolidate learning and apply concepts before scheduling the next meeting with lecturers.

• Encouragement to engage actively in homework and upcoming assessments, utilizing the resources provided.