'Since the 1/l and 0/O were displayed
identically, the programmers didn't find the prank funny. Our
instructor said as he traveled the US training groups, he hoped he would
find the guy. 10 or 15 years later he was still more than a tad angry.
All for lack of slashes and serifs.'
the 1/l/i confusion was a real problem in those days when I saw numberless frustrated programmers whose programs did anything but the expected.
There's many obfuscation tools for 'C' that existed back in the day which did the above automatically. I've had the displeasure to debug code run through that for which the original source has been lost... "Pleasure" ... right. I'll go with that since this is still polite company.
Warner