996 B
reverse-polish-notation
Created by @Divlo on 29 September 2020.
Instructions
Your job is to create a calculator which evaluates expressions in Reverse Polish notation (a mathematical notation in which operators follow their operands. It does not need any parentheses as long as each operator has a fixed number of operands).
For example expression 5 3 + (which is equivalent to 5 + 3 in normal notation) should evaluate to 8.
For your convenience, the input is formatted such that a space is provided between every token.
Empty expression should evaluate to 0.
Valid operations are +, -, *, /.
You may assume that there won't be exceptional situations (like stack underflow or division by zero).
All the numbers are integers; you don't need to worry about floating point numbers.
Source
Examples
See the test folder for examples of input/output.