2 char - character corresponding to a value
8 j integer, 0 <= j < 256
13 For j > 0, returns a string of length 1 with a character that has
14 the same value as j. For j = 0, returns the null string "".
17 > print char(0102), char(0x6f), char(119), char(0145), char(0x6e)