Postfix-Calculator-Android-App

User Interface

• The app provides one activity.
• The top four items on the stack will be displayed in text views.
• The number currently being entered will be displayed in a text view.

The calculator has the following keys:

1. Digits 0 through 9
2. Decimal point
3. Enter
4. Del
5. Addition, subtraction, multiplication, and division
6. Drop

Operation

• Digit keys and decimal point are used to enter numbers.
• The Del (backspace) removes the most recently entered digit (or decimal point) from the current number.
• Enter pushes the current number onto the stack.
• Drop pops the number from the top of the stack and discards it.
• The addition, subtraction, multiplication, and division keys pop the top two operands from the stack, perform the operation, and push the results back onto the stack.

Specifications

• The app will retain the contents of the stack when paused.
• Activity is locked to a single orientation.
• The current number may be entered with only one decimal point.
• Application uses an instance of java.util.Deque to hold the stack.

#Note:

For installation and other instructions read the Readme file inside ReadMe folder.

Project assgined By: Prof Avery.

Project Developed By: Varun Krishna.