EfunsContrib PackagevowelOn this pagevowel NAME vowel() - test whether a character is a vowel SYNOPSIS int vowel( int c ); DESCRIPTION Returns 1 if the character code `c` is an ASCII vowel(a, e, i, o, u in either case), 0 otherwise. Used together withadd_a() for article selection. SEE ALSO add_a(3)