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Recursion in Scheme

Recursion in Scheme. recursion is the basic means for expressing repetition some recursion is on numbers factorial fibonacci some recursion is on structures list length member of a list. Basics of recursion. The basic elements of a recursive function are: a base case:

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Defining new functions (contd)

Defining new functions (contd). xmemb [x, list] = ; is x a member of list? [ null?[list] ? NIL; | eq ?[x, car[list]] ? T; | T ? xmemb [x, cdr [list]] ] Define a function that will return a count of how many times x appears in list A useful function:

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Recursion in Scheme

Defining new functions (contd)