rpn - 4 function CLI RPN calculator

This is a small calculator in C for RPN calculating at the command line. Expressions are read from STDIN. Compile with make and run ./rpn to enter the REPL.

Usage

• output

  10 .
  

  Prints 10, the value at the top of the stack.

• addition

  10 2 + .
  

  Prints 12, the sum of 10 and 2.

• subtraction

  100 50 - .
  

  Prints 50.

• division

  12 4 / .
  

  Prints 3.

• multiplication

  3 3 * .
  

  Prints 9.

Note that you can 'peek' the top of the stack anywhere in an expression, ie:

1 2 + . 4 * . 5 + . 3 - .

Prints:

3
12
17
14