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I was going nuts trying to figure out why my moving blocks wouldn't change direction in the Android version (they worked fine in both Windows and iOS).

And it came down to the type of the variable I was using.

The 'if' statement that would trigger when to change direction was based on checking for the variable to be less than one.

The variable was defined as a char (which, in most systems, can be used as a number between -127 and 127). I was going for using the smallest variables necessary for each purpose.

However, in the Android world (built in cygwin with gcc), this comparison was not working when the variable got set to minus one.

But, as soon as I changed it to a regular integer, it was happy.

So, the lesson is:
DO NOT use 'char' and 'unsigned char' for variables that will be used in numeric operations (logic or math) if you want to keep your cross-platform programming working.

That is good to know, thanks for the info

Interesting. I'll admit, I'm not as conservative, I'll happily use integers for small values without thinking twice. I only use chars for strings.

This is nitpicking but:

I believe it's -128 and 127 ( a semester of binary and assembly will do that to you). Not that it matters in this case.

You are correct, it is -128 to 127. When I wrote it, there was a niggling thought that there should be a 128 in there somewhere.