Calculater

Android calculator, based on postfix converter.

This calculater use postfix notation to calculate all stuff. For example, we have infix notation: 12 - 5 * 2

First of all, we convert this infix notation to postfix: 12 5 2 * -

(Use class PostfixConverter to convert infix notation.)

Then calculate this postfix notation using class PostfixCalculator.

Example:

// Convert to postfix
PostfixConverter converter = new PostfixConverter(new Scanner(System.in).nextLine());
System.out.println("Postfix notation of current regular: " + converter.getPostfix());
// Calculate
PostfixCalculator calculator = new PostfixCalculator(converter.getPostfix());
System.out.println("Result is " + calculator.getResult());

If we already have user infix input, we can convert it too:

String input = "10 + 4 * 2";
PostfixConverter converter = new PostfixConverter(input);
converter.getPostfix(); // Return string "10 4 2 * +"

Or we just can calculate postfix notation:

String postfix = "10 4 2 * +";
PostfixCalculater calculater = new PostfixCalculater(postfix);
calculater.getResult(); // Return number 18