VinsWorldcom@C:\Users\VinsWorldcom\tmp> perl -v

This is perl 5, version 18, subversion 1 (v5.18.1) built for MSWin32-x64-multi-thread

[...]

VinsWorldcom@C:\Users\VinsWorldcom\tmp> test.pl
Power of calculation test
line 1: -8
line 2: -1.#IND
line 3: -1.#IND
line 4: -1.#IND