The first program that may have some issue with UTF-8 seems to be on page 18. The trouble with writing a UTF-8 aware "character counting" program is that the de

The first program that may have some issue with UTF-8 seems to be on page 18. The trouble with writing a UTF-8 aware "character counting" program is that the definition of "character" is pretty complex. A "correct" program would not fit on one page, and would need to be updated as more emoji ligatures are added to the standard. It would perhaps be good to clarify that "character" means "byte" in this program. The line counting program on page 19 is correct for UTF-8 inputs. The word counting program on page 20 works as specified (the specification says it only uses 3 specific delimiters) for UTF-8 inputs. The digit counting program is correct for UTF-8 inputs. The "longest input line" program doesn't really specify what "longest" means, but it finds the one with the most bytes. There are maybe 2 examples that don't work on UTF-8, if the standard is that "longest line" and "character counting" programs should detect that ":regional_indicator_s::regional_indicator_u:" is 2 characters while ":regional_indicator_u::regional_indicator_s:" is 1 character. Such programs may not make a very good introduction to programming though.