Update 676-language-xor.markdown

Author: Joe7M

_build/reference/676-language-xor.markdown

@@ -1,47 +1,21 @@
 # XOR
 
-> a XOR b
+> n = a XOR b
 
-Bitwise exclusive OR. Equivalent syntax to: a ~ b
+Bitwise exclusive OR.
 
+Truth table:
 
-~~~
+| a | b | a XOR b |
+|:-:|:-:|:-------:|
+| 0 | 0 | 0       |
+| 0 | 1 | 1       |
+| 1 | 0 | 1       |
+| 1 | 1 | 0       |
 
-' return true if n is ASCII code of letter (A-Z|a-z); e.g. ? isAbc(Asc("z"))
-Def isAbc(n) = ((n >= 65 And n <= 90) Or (n >= 97 And n <= 122))
-
-' change case of string s; mode is -1, 0, 1 (lower, invert, upper). 
-Func ccase(s, mode)
-  Local i, n
-  
-  For i = 1 To Len(s)
-    n = Asc(Mid(s, i, 1))
-    If isAbc(n) Then
-      Select Case mode
-        Case -1: n = n Bor  0b00100000 ' set bit-5 to lower case
-        Case  0: n = n Xor  0b00100000 ' invert bit-5 to invert case
-        Case  1: n = n Band 0b11011111 ' reset bit-5 to upper case 
-      End Select
-      s = Replace(s, i, Chr(n))
-    Endif
-  Next
-  ccase = s
-End
-
-' run demo:
-Repeat
-  Cls
-  Input "Enter a string (Enter empty to stop): ", s
-  
-  Print
-  Print "  Upper case: "; ccase(s, 1)
-  Print "  Lower case: "; ccase(s, -1)
-  Print " Invert case: "; ccase(s, 0)
-  Pause
-Until s = ""
-
-~~~
-
-XOR is Not equivalent syntax to: a ~ b
-~ is bitwise NOT, for example: ~b
+### Example
 
+```
+print 0 xor 1                     ' Output: 1
+print bin(0b1100 xor 0b1010)      ' Output: 110
+```