This Java-based calculator performs various mathematical operations.
Basic operations: Addition, Subtraction, Multiplication, Division
Fibonacci Sequence Calculation
Array-based operations: Sum, Mean, Variance, Standard Deviation
Main.java: Handles user interaction and program flow.
UserInput.java: Manages user input and menu selection.
Calculator.java: Implements all mathematical functions.
1.Compile the program using javac Main.java
2.Run it using java Main
Added Main.java with program entry point
Added UserInput.java to handle user input
Added Calculator.java with mathematical operations