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The sets of characters tested for by the  isalnum,  isalpha,  iscntrl, 
islower,  isprint, and  isupper functions (4.3.1).

isalnum
    Characters 0-9, A-Z, a-z

isalpha
    Characters A-Z, a-z

iscntrl
    ASCII 0x00-0x1f, 0x7f

islower
    Characters a-z

isprint
    ASCII 0x20-0x7e

isupper
    Characters A-Z

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