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

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Computer Programming

Loops

Vasileios Evangelos Athanasiou
Student ID: 19390005

GitHub · LinkedIn

Supervisor: Georgios Meletiou, Laboratory Teaching Staff

UNIWA Profile

Athens, December 2021

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Project Overview

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	Repository overview and instructions

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Theoretical Background

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.

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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Source Code Implementations

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. 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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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

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Installation & Setup Guide

This repository contains introductory laboratory material for the
Computer Programming course at the University of West Attica (UNIWA).

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Prerequisites

Required Software

• C Compiler

  • Recommended:
    • GCC (Linux / macOS / Windows via MinGW or WSL)

• Text Editor or IDE

  • Visual Studio Code (Recommended)
  • Code::Blocks
  • Dev-C++
  • CLion
  • Any plain text editor

Supported Operating Systems

• Windows
• Linux (Recommended)
• macOS

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Installation

1. Clone the Repository

Clone the repository to your local machine:

git clone https://github.com/Computer-Programming-aka-Uniwa/Control.git

Alternative (Without Git)

• Open the repository URL in your browser
• Click Code → Download ZIP
• Extract the ZIP file to a local directory

Compiling & Running the Programs

2. Navigate to Source Directory

cd Loops/src

3. Compile the Programs

gcc MathsWithIntegersInLoopA.c -o MathsWithIntegersInLoopA
gcc MathsWithIntegersInLoopB.c -o MathsWithIntegersInLoopB
gcc Stars.c -o Stars
gcc SinTaylor.c -o SinTaylor -lm

-lm is required to link the math library

4. Run the Programs

Linux / macOS

./MathsWithIntegersInLoopA
./MathsWithIntegersInLoopB
./Stars
./SinTaylor

Windows

MathsWithIntegersInLoopA.exe
MathsWithIntegersInLoopB.exe
Stars.exe
SinTaylor.exe

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Open the Documentation

1. Navigate to the docs/ directory
2. Open the report corresponding to your preferred language:
   • English: Loops.pdf
   • Greek: Βρόχοι.pdf