Which language is not cross-platform?

Python is a cross-platform language: a Python program written on a Macintosh computer will run on a Linux system and vice versa . Python programs can run on a Windows computer, as long as the Windows machine has the Python interpreter installed (most other operating systems come with Python pre-installed).

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There are five languages directly coming into my mind: Python, C/C++ and the JVM languages Java, Scala and Clojure . Regarding platforms you shouldn’t have any issues to find languages since most languages run on all platforms.

Any kind of assembly language is not cross platform as it’s direct representation of a specific architecture’s instruction set in human readable form.