[eclipse-clp-users] Not equal constraint in String

Dear Clp Users,



  Following script

solve(STR1, STR2, STR3):-

  STR3 = "ABCD",
  append_strings(STR1, STR2, STR3),
  STR1 \= "",

outputs the following

?- solve(STR1, STR2, STR3).
STR1 = "A"
STR2 = "BCD"
STR3 = "ABCD"
Yes (0.00s cpu, solution 1, maybe more)

----------------------------------------------------------------------------------

whereas the following script

solve(STR1, STR2, STR3):-

  STR3 = "ABCD",
  STR1 \= "",
  append_strings(STR1, STR2, STR3),

renders

?- solve(STR1, STR2, STR3).
No (0.00s cpu)



What is the difference ? Am I missing anything here ?



Thanks in advance.



Regards,

Shrirang Edgaonkar

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