String Manipulation in C

This program provides various string manipulation functions written in C. It can convert a string to uppercase or lowercase, replace non-alphanumeric characters with a custom separator, and replace numbers with their English word equivalents. This project was originally a homework assignment and has since become a great exercise for practicing C programming skills.

Table of Contents

• Introduction
• Features
• How to Use
• Example
• Contributing

Introduction

This C program manipulates strings using the following functionalities:

• Converts strings to uppercase or lowercase.
• Replaces non-alphanumeric characters with a specified separator.
• Replaces digits with their English word equivalents (e.g., '1' becomes 'one').
• Combines these functionalities for flexible string modifications.

Features

• toUpper: Converts a string to uppercase.
• toLower: Converts a string to lowercase.
• replaceWithSeparator: Replaces non-alphanumeric characters with a specified separator.
• replaceNumberWithEnglishSubstitute: Converts numbers in the string to their English word equivalents.
• modifyString: A combined function that performs the following:
  • Replaces non-alphanumeric characters.
  • Converts digits to words.
  • Changes the case of the string (uppercase or lowercase).

How to Use

Prerequisites

You will need a C compiler to compile and run the program. You can use either gcc or clang.

Compilation

To compile the program, run the following command:

gcc -o string_manipulation string_manipulation.c

Running the Program

Once compiled, you can run the program like this:

./string_manipulation

By default, the program will modify the string "!!!Hello 1234 World!!!", replacing non-alphanumeric characters with a dash (-), converting numbers to words, and converting the string to lowercase.

Example

Given the input string "!!!Hello 1234 World!!!" with the separator '-' and the option to convert to lowercase, the output will be:

hello-onetwothreefour-world

Contributing

If you'd like to contribute to this program, feel free to fork the repository and submit a pull request. Suggestions and improvements are always welcome!