Use Prolog only (syntax and semantics.} (Use siwpl-SWI-Prolog) Define a relation

Question

Use Prolog only (syntax and semantics.} (Use siwpl-SWI-Prolog)

Define a relation contains which relates dishes and all of their ingredients with the corresponding quantities. For instance, pancakes contain 3 units of milk, 4 units of flour and 3 units of eggs. Then define a relation available which describes the available ingredients and their quantities. For example: we may have 3 units of milk and 4 units of jam available.
Finally define two relations:
can_cook(X) which should hold for a dish X if all its ingredients are available in the required quantities;
needs_ingredient(X, Y) which holds for a dish X and an ingredient Y if X contains Y .

Explanation / Answer

?- can_cook(x) :- need_ingredient(x,y).

x=pancakes

y= 3 units of milk,

x=pancakes

y=4 units of flour,

x=panckaes

y = 3 units of egg

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