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pl:prolog:pllib:list_sum_3 [2019/06/27 15:50] |
pl:prolog:pllib:list_sum_3 [2019/06/27 15:50] (aktualna) |
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| + | ====== List sum 3 ====== | ||
| + | {{tag>lists arithmetic}} | ||
| + | ===== Description ===== | ||
| + | Iterative version of summing a list of integers using an accumulator. | ||
| + | |||
| + | **Source**: The Art of Prolog | ||
| + | ===== Download ===== | ||
| + | Program source code: {{list_sum_3.pl}} | ||
| + | ===== Listing ===== | ||
| + | <code prolog> | ||
| + | /* | ||
| + | sumlist(Is,Sum) :- Sum is the sum of the list of integers Is. | ||
| + | */ | ||
| + | sumlist(Is,Sum) :- sumlist(Is,0,Sum). | ||
| + | |||
| + | sumlist([I|Is],Temp,Sum) :- | ||
| + | Temp1 is Temp+I, sumlist(Is,Temp1,Sum). | ||
| + | sumlist([],Sum,Sum). | ||
| + | |||
| + | % Program 8.6b Iterative version of summing a list of integers | ||
| + | % using an accumulator | ||
| + | </code> | ||
| + | ===== Comments ===== | ||
