📱 Calculator Application

A powerful and easy-to-use calculator application built with Jetpack Compose. This application supports both basic arithmetic and scientific calculations with a user-friendly interface.

✨ Features

🧮 Level 1: Basic Calculator

Perform essential arithmetic operations with ease:

• ➕ Addition (+)
• ➖ Subtraction (-)
• ✖️ Multiplication (*)
• ➗ Division (/)

🔬 Level 2: Scientific Calculator

Unlock advanced mathematical operations:

• 📐 Trigonometric Functions: sin(), cos(), tan()
• 📊 Logarithmic Functions: log(), ln()
• 📈 Power and Root Calculations: x^y, √x
• 🎯 Factorial Calculation: n!

📖 Usage

Basic Calculator:

1. Enter numbers and select the arithmetic operation.
2. Press the "=" button to view the result.

Scientific Calculator:

1. Access advanced functions like trigonometry and logarithmic calculations.
2. Perform complex operations seamlessly with intuitive input.

App Preview

📸 Demo Video

📸 Screenshots

📂 Tech Stack

1. Language: Kotlin
2. Framework: Jetpack Compose
3. Environment: Android Studio

🛠️ Features and Functionalities

1. User Interface (UI)

• MainActivity: Entry point of the application where the CalculatorUI() Composable is called.
• CalculatorUI(): Main calculator layout containing:
  • Display Box: Shows the user input and results.
  • Button Grid: Includes all calculator buttons (numbers, operators, and scientific functions).

2. Calculator Buttons

• CalculatorButton(): A reusable Composable function to create buttons.

  • Parameters:
    • label: Button text (e.g., "+", "sin", "AC")
    • onClick: Action performed on button click

• Button Categories:

  • Basic Operations: "+", "-", "×", "÷"
  • Scientific Operations: sin, cos, tan, log, ln, √, !, %, ^
  • Special Functions: AC (All Clear), ⌫ (Backspace), = (Evaluate)

3. Input Handling

• newInput(): Validates and updates user input.
  • Ensures correct operator usage (e.g., prevents multiple decimals).
  • Automatically multiplies constants like π or e when required.
  • Handles bracket and other edge cases.

4. Expression Evaluation

• calculateResult(): Parses and evaluates mathematical expressions.

• evaluateExpression(): Core parsing logic to compute results.

  • Replaces custom symbols (×, ÷, π, e) with standard equivalents.
  • Auto-closes open parentheses.
  • Supports chained operations.

5. Mathematical Function Processing

• handleFunctions(): Processes trigonometric and logarithmic functions.

  • Supports both Radians and Degrees for sin, cos, and tan.

• handleFactorial(): Calculates the factorial of a number.

• handlePower(): Evaluates exponentiation (e.g., 2^3).

• handleSquareRoot(): Computes square roots.

• handlePercentage(): Converts percentages to decimals.

6. Utility Functions

• findClosingParenthesis(): Finds the matching closing parenthesis for expressions.

• formatResult(): Formats the output, removing trailing zeros for clean display.

• degreesToRadians(): Converts degrees to radians for trigonometric calculations.

7. Error Handling

• Built-in error checks prevent invalid calculations (e.g., division by zero).
• Provides a Error message for invalid inputs.

📣 Additional Notes

• Ensure you switch between Radians and Degrees using the Rad/Deg toggle.
• Factorials are supported only for positive integers.
• Invalid inputs return an Error message.

📦 Installation

Download and install the latest release from GitHub:

📧 Contact

For any queries or feedback, reach out via:

• GitHub: DevanshuDubey