PyRPN
Mini Reverse Polish Notation (Postfix notation) parser and evaluator
It uses a stack based system.
| Keyword | Definition | Stack Before | Stack After |
|---|---|---|---|
dup |
Duplicates the stack top | 5 5 4 | 5 5 4 4 |
swap |
Swap the top 2 stack items | 1 2 3 | 1 3 2 |
rot |
Rotates the top 3 stack items | 1 2 3 | 3 1 2 |
drop |
Removes the last stack item | 1 2 3 | 1 2 |
sum |
Sums up the stack, and pushes the result | 1 2 3 | 6 |
avg |
Averages the stack, pushes result | 2 4 6 | 3 |
print |
Pops and prints the stack top | 5 5 | 5 |
+ |
Adds the top two stack items, pushes the result | 5 10 15 | 5 25 |
- |
Subtracts the top two stack items, pushes the result | 5 10 15 | 5 -5 |
* |
Multiplies the top two stack items, pushes the result | 2 5.5 2 | 11.0 |
/ |
Divides the top two stack items, pushes the result | 5 10 2 | 5 5 |
Example:
Input: 15.5 1.5 + 2 swap + 2 5 * - print
Output: -9.0
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