rpn-calculator

dc command-like to compute rpn - Reverse Polish notation expression.

• rpn-calculator
  • Download and run
  • Examples
  • How to use
  • Supported operation
  • Supported commands

Download and run

To download the repo, you can either download the .zip file for this project, or use git commands as bellow :

$ git clone https://github.com/GouruRK/rpn-calculator.git

This repo uses the readline library. Donwload it with

$ sudo apt-get install libreadline-dev.

To compile it, go in the rpn-calculator folder and run the make command to compile it. It creates an executable rpn.

$ cd rpn-calculator
$ make
$ ./rpn

Examples

$ ./rpn
1 3 p + 4 * p q
3
16

$ ./rpn
p c a 1 a c a c 0 r 1 r / % ^ a 3 ^ a 3 r ^ a 42 1984 a - - - - a 1947 - a ! 5 + ! a q
rpn: stack empty
[] <- HEAD
[1] <- HEAD
[] <- HEAD
rpn: stack empty
rpn: divide by 0
rpn: divide by 0
[1] <- HEAD
[1] <- HEAD
[3] <- HEAD
[3, 42, 1984] <- HEAD
rpn: stack empty
rpn: stack empty
[1945] <- HEAD
[-2] <- HEAD
rpn: factorial of negative number
[6] <- HEAD

How to use

• Tokens must be separated by spaces or new lines
• Relatives numbers must be written as -a
• This implementation does not support floating numbers
• If computing a sequence triggers an error, the stack stays untouched

Supported operation

Operation	Input	Calculated
+	a b +	a + b
-	a b -	a - b
*	a b *	a * b
/	a b /	a / b
%	a b %	a % b
^	a b ^	a ^ b
!	a !	a!

Supported commands

• a : Print the stack
• p : Print the first element of the stack
• r : Reverse the top two elements of the stack
• c : Clear the stack
• q : Quit