Connected Numbers

I was recently shown this puzzle: There are some things I found a little unclear about it. For example, should the following two circles count as being connected? There is a line between them, even if it’s interrupted by a circle. And what about these two circles? Are they connected? Again, there’s a diagonal line […]

PHP vs Perl

Here's a simple program which calculates, to eight decimal places, the value of the Golden Ratio φ implemented in both PHP and Perl, to demonstrate their similarities. Perl #!/usr/bin/perl $a = 1; $b = 1; $c = undef; $psi_old = undef; print “Approximating psi…\n”; while (1) { $psi = sprintf(‘%.08f’, $b/$a); last if ($psi_old eq […]