Command.java

public enum Command {
    MENU("Display the menu of available commands."),
    CALCULATOR("Evaluate standard mathematical expressions."),
    DIFFERENTIATE("Differentiate mathematical expressions."),
    FUNCTION("Define and perform operations on functions."),
    LINEAR_ALGEBRA("Perform linear algebra operations like matrix and vector calculations."),
    SIMUL_SOLVER("Solve simultaneous equations."),
    FINANCIAL_CALC("Access the financial calculator for loans, savings, and conversions."),
    ENG_CALC("Perform engineering calculations"),
    SCI_CALC("Perform scientific conversions"),
    STAT_CALC("Evaluate normal and uniform distribution variables"),
    EXIT("Exit the program.");

    private final String description;

    Command(String description) {
        this.description = description;
    }

    public String getDescription() {
        return description;
    }
}