propeller.problems.PSB2.middle-character
=========== PROBLEM DESCRIPTION =============================
MIDDLE CHARACTER from PSB2
Given a string, return the middle
character as a string if it is odd length; return the two middle
characters as a string if it is even length.
Source: https://arxiv.org/pdf/2106.06086.pdf
===============================================================
-main
(-main & args)
Runs propel-gp, giving it a map of arguments.
error-function
(error-function argmap data individual)
Finds the behaviors and errors of an individual: Error is 0 if the value and
the program's selected behavior match, or 1 if they differ, or 1000000 if no
behavior is produced. The behavior is here defined as the final top item on
the STRING stack.
instructions
stack-specific instructions, input instructions, close, and constants
random-int
(random-int)
Random integer between -100 and 100