This is a simple calculator program written in Java that can perform basic mathematical operations, such as addition, subtraction, multiplication, and division. The program reads user input from the console and uses a combination of string parsing and object-oriented design to evaluate the input and produce a result.
- Object-oriented programming (OOP) principles
- Interfaces
- Exception handling and custom exceptions
- String parsing and manipulation
- Basic mathematical operations
- Java
- Git
This project was developed as a learning exercise to practice core Java programming concepts, including OOP, interfaces, and exceptions. By completing this project, I gained a deeper understanding of how to design and implement object-oriented software systems, as well as how to handle and recover from errors in Java programs. Additionally, I learned how to use Git for version control and project management, which will be useful for future software development projects.
To run the Simple Calculator program, follow these steps:
- Clone the repository to your local machine using Git or download the ZIP file and extract it.
- Open a command prompt or terminal window and navigate to the project directory.
- Compile the Java code using the command
javac *.java. - Run the program using the command
java Main.
You should now see a prompt in the console asking you to enter a mathematical expression. You can enter expressions using the standard format, such as "1 + 2" or "5 * 3.2". Press Enter to evaluate the expression, or type "exit" to exit the program.
InputHandler.java Main.java Token.java /ErrorHandling ErrorHandling/ParseException.java /Interface Interface/IOperator.java /Util util/AdditionCalculator.java util/DivisionCalculator.java util/MultiplicationCalculator.java util/OperatorFactory.java util/SubtractionCalculator.java
The project has a simple directory structure.
The .gitignore file specifies files and directories that should be excluded from version control, while the README.md file contains information about the project and how to use it.
This Simple Calculator program is a basic implementation that can be expanded in many ways. Some possible improvements include:
- Adding support for more mathematical functions, such as logarithms, exponentials, and trigonometric functions.
- Implementing a graphical user interface (GUI) to make the program more user-friendly.
Overall, this Simple Calculator project was a great way to learn and practice core Java programming concepts, and I look forward to exploring more advanced topics in the future.