UNIVERSITY OF WEST ATTICA
SCHOOL OF ENGINEERING
DEPARTMENT OF COMPUTER ENGINEERING AND INFORMATICS

University of West Attica · Department of Computer Engineering and Informatics

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Computer Programming

Loops

Vasileios Evangelos Athanasiou
Student ID: 19390005

GitHub · LinkedIn

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Supervision

Supervisor: Nikolaos Vassilas, Professor

UNIWA Profile

Co-supervisor: Georgios Meletiou, Laboratory Teaching Staff

UNIWA Profile

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Athens, December 2021

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README

Loops

This project explores the fundamental concepts of iterative structures (loops) in the C programming language. It provides a comprehensive theoretical background followed by practical implementations through various source code examples.

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Table of Contents

Section	Folder / File	Description
1	assign/	Assignment material
1.1	assign/project4.png	Assignment description / problem statement (English)
1.2	assign/εργασία4.png	Assignment description / problem statement (Greek)
2	docs/	Theoretical documentation
2.1	docs/Loops.pdf	Loops and iteration in C (English)
2.2	docs/Βρόχοι.pdf	Loops and iteration in C (Greek)
3	src/	Source code implementations
3.1	src/MathsWithIntegersInLoopA.c	Integer operations using for/while loops (example A)
3.2	src/MathsWithIntegersInLoopB.c	Integer operations using for/while loops (example B)
3.3	src/SinTaylor.c	Computing sine using Taylor series in loops
3.4	src/Stars.c	Loop exercises: printing patterns (stars)
4	README.md	Project documentation
5	INSTALL.md	Usage instructions

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1. Theoretical Background

1.1 Iterative Structures

Iterative structures are instructions that execute a body of code repeatedly based on a specific condition.

• The loop continues while the condition is true (non-zero)
• Terminates when the condition becomes false (zero)

Supported Loops in C:

• while: Executes a body of instructions as long as the condition evaluates to true.
• do-while: Executes the loop body at least once, then checks the condition.
• for: Commonly used for a predetermined number of iterations, accepts initialization, condition, and modification.

1.2 Control Commands

• break: Immediately exits the loop and continues execution after the loop.
• continue: Skips the current iteration and moves to the next loop cycle.

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2. Source Code Implementations

2.1 MathsWithIntegersInLoopA.c

Performs mathematical operations on a user-defined number of integers.

Functionality:

• Calculates the square of odd numbers
• Counts the number of even numbers
• Computes the average of positive numbers
• Computes the product of negative numbers

Key Logic:
Uses a while loop that iterates until the counter i reaches the user-specified limit N.

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2.2 Stars.c

Visualizes geometric shapes using asterisks (*) based on user input for the number of lines.

Functionality:

• Plots four distinct asterisk-based figures
  • Figure 1: Right-angled triangle
  • Figure 4: Square perimeter with diagonal markings

Key Logic:
Uses nested for loops to handle row and column positions for characters.

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2.3 SinTaylor.c

Calculates the sine of an angle using the Taylor series and compares it with the standard library sin() function.

Functionality:

• Converts user-inputted degrees to radians
• Iteratively computes Taylor series terms until the difference between successive terms < 10⁻⁶

Key Logic:

• Uses a do-while loop to sum series terms
• Alternates addition and subtraction using a sign toggle variable