c17f99t2 - CSc 17 Test 1 Monday 22 November 1999 >SUGGESTED...

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CSc 17 Test 1 Monday 22 November 1999 >>>>>>>>>>>>>>>>>>>>>SUGGESTED ANSWERS<<<<<<<<<<<<<<<<<<<<<<<<< 1. (25 pts) Write a private recursive member function for the class Tree which visits every node in a binary tree and increments the number in each node by 1. Assume the function is named INC and is called by other member functions as follows, INC(root), where the class Tree is defined as follows: class Tree{ class BinaryNode{ public: int key; BinaryNode *child[2]; }; public: //other stuff private: BinaryNode *root; //other stuff }; You need not write the prototype of INC. INC can assume that root is either NULL or the root of a properly built binary tree. void Tree::INC(BinaryNode *rt){ if(rt!=NULL){ rt->key++; INC(rt->child[0]); INC(rt->child[1]); } } 2. (15 pts) Suppose that the class Node is as defined below. Document the function PURP, below. class Node{ public: int x; Node *a[2]; }; //Return the product of all the entries in the tree whose root is r //PreConditions: r is either NULL or points to a properly constructed //tree, where each child is another node or NULL int PURP(Node *r){ if(r==NULL) return 1; else
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