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Arithmetic
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  • Souffle supports standard arithmetic operations +, -, *, /, ^ and %. Examples of this are given below.
.decl e(x:number, t:symbol, y:number)
e(10 * 2,"10*2", 20).
e(10 + 2,"10+2", 12).
e(10 / 2,"10/2", 5).
e(10 ^ 2 , "10^2", 100).
e(10 % 3, "10%3", 1).
e(2^4%13 , "2^4%13",3).
  • Souffle supports standard unary operation -.
e(-2*10,"-20", -20).
e(-2,"-2", -2).
e(--2,"--2", 2).
  • Souffle supports standard binary operations >, <, =, !=, >= and <=. Examples of this are given below.
A(a,c) :- a > c.
B(a,c) :- a < c.
C(a,c) :- a = c.
D(a,c) :- a != c.
E(a,c) :- a <= c.
F(a,c) :- a >= c.
  • $ is used to generate unique random values to populate a table. It should be used with care as it may result in stepping outside the standard Datalog semantics.
.decl A (n:number)
.decl B (a:number, b:number)
.decl C (a:number, b:number)
.output C
A(0).
A(i+1) :- A(i), i<1000.		
B($,i) :- A(i).		
C(i,j) :- B(c,i), B(c,j), i!=j.

The above example does not output anything.

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