CODEWITHSUNDEEP
prolog
asp_NewBee
asp_NewBee

Reputation: 299

Prolog loops and conditional statements?

Is there anything in Prolog that works like a for loop and if then condition?

Upvotes: 4

Views: 4698

Answers (2)

mat
mat

Reputation: 40768

if/then/else can be obtained with (->)/2 and (;)/2:

(    If ->
     Then
;    Else
)

Sometimes this is useful. In general though (when the condition contains variables), it will make your programs unsound and incomplete. Whenever it is possible to describe the conditions with pattern matching, you should use pattern matching instead. You can then not only check but also generate solutions.

Upvotes: 11

Jack
Jack

Reputation: 133639

If you are looking for such kinds of statements then you are not thinking in Prolog :)

Just kidding, by the way there aren't plain translation or for and if/else, but you can think about how they should be in prolog:

  • an if/else statement can be obtained by just having two rules that match over different conditions
  • a for loop can be done with two recursive rules, one is the base case and it doesn't depends upon itself to keepon while the other does what you intend to do inside the loop and follows itself..

Upvotes: 8

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