name, address = string
age = integer
list = age*
Predicates
person(name, address, age)
sumlist(list, age, integer)
Goal
Findall(Age, person(_, _, Age), L),
Sumlist(L, Sum, N),
Ave = Sum/N,
write("Average =", Ave), nl.
Clauses
sumlist([], 0, 0).
sumlist([H|T], Sum, N):- sumlist(T, S1, N1), Sum=H+S1,
N=1+N1.
person("Sherlock Holmes", "22B Baker Street", 42).
person("Pete Spiers", "Apt. 22, 21st Street", 36).
person("Mary Darrow", "Suite 2, Omega Home", 51).
findall L, , person. 42 ,
Findall(Who, person(Who,_,42), List).
8.5. .
,
[2,3,5,12,[food,"goo"], "new"]
, . , , , . .
, , , , . , . , :
Domains
llist = l(list); s(symbol); i(integer); c(char); t(string)
list = llist *
:
[i(2),(3),i(5),i(12), [c(food),s(goo)],s(new)]
append :
Domains
llist = l(list); s(symbol); i(integer); c(char); t(string)
list = llist *
Predicates
Append(list, list, list)
Goal
makewindow(1,7,7, "answer",15,0,8,80),
/*Note how you can use the same code but need functors *
* append([likes,[bill,mary]],[bill,sue],Ans) */
append([s(likes),l([s(bill),s(mary)])],[s(bill),s(sue)],Ans), */
write("First List:", Ans), nl,nl,
/*The trick is to write the list first, than add the functors *
* append([apple,[[[47], '\1']], [[["This is a string",b,7, *
* 'w']],bee], ['c'], Ans2) */
*
append([l[s("This"), s("is",s("a"),s("list"))]), s(bee)],
[c('c')], Ans2),
write("Second List:", Ans2), nl.
Clauses
/* Concatenate two lists */
append([], L, L).
append([X|L1], L2, [X|L3]):- append(L1, L2, L3).
8.6. .
.
' : .
|
|
|
:
Domains
toklist = string*
Predicates
Tokl(string, toklist)
