PPT Slide

/* count ( Item, List, Ans ) */

count( _ , [ ] , 0 ) .

count( X , [ X | T ] , N ) : - count( X , T , J ) , N is J + 1 .

count( X , [ _ | T ] , N ) : - count( X , T , N ) .

| ? - count ( a , [ a , b , a , e , r , a , a , e , q , a ] , X ) .

P.33

COUNTING THE NUMBER OF OCCURRENCES OF A PARTICULAR ITEM IN A LIST

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