char/=

Type:	-	function (subr)
Source:	-	xlstr.c

Syntax

(char/= char1 charN ... )

char1 - a character expression
charN - character expression(s) to compare
returns -  T  if the characters are not equal, NIL otherwise
Note: case is significant with this function

Description

The 'char/=' [character-not-equal] function takes one or more character arguments. It checks to see if all the character arguments are different values.  T  is returned if the arguments are of different ASCII value. In the case of two arguments, this has the effect of testing if 'char1' is not equal to 'char2'. This test is case sensitive, the character '#\a' is different and of greater ASCII value than '#\A'.

Examples

(char/= #\a #\b)      ; returns T
(char/= #\a #\b #\c)  ; returns T
(char/= #\a #\a)      ; returns NIL
(char/= #\a #\b #\b)  ; returns NIL
(char/= #\A #\a)      ; returns T
(char/= #\a #\A)      ; returns T

Note: Be sure that the 'char/=' function is properly typed in. The '/' is a forward slash. It is possible to mistakenly type a '\' (backslash). This is especially easy because the character mechanism is '#\a'. If you do use the backslash, no error will be reported because backslash is the single escape character and the XLISP reader will evaluate 'char\=' as 'char='. No error will be reported, but the sense of the test is reversed.

See the char/= function in the XLISP 2.0 manual.

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