c17su99f - CSc 17 Final Examination Friday 2 July 1999 Page...

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CSc 17 Final Examination Friday 2 July 1999 Page 1 >>>>>>>>>>>>>>ANSWERS>>>>>>>>>>>>>>>>>>>>>>>>. 1. (25 pts) Call an array of ints with one entry "balanced" if the entry is 9. Call an array of ints with two entries "balanced" if the sum of the two entries is 9. Call an array of ints with more than two entries "balanced" if the sum of the first and last entry is 9 and the rest of the array between the first and last entries is balanced. Use this recursive definition (and do not change it) to write a recursive function "balanced" which is called as follows, balanced(x,first,last), where x is an array of ints and first and last are ints giving the locations of the first and last entries in the array. The call "balanced(x,first,last)" should return true when the array is balanced and false otherwise. bool balanced(int x[],int first,int last){ if(first>last) return true; if(firts==last) return x[first]==9; return( x[first]+x[last]==9 && balanced(x,first+1,last-1)); } 2. (10 pts) Assume the class IntStack is defined as follows: class IntStack{ public: IntStack(int n); IntStack(IntStack & stk); ~IntStack(); bool empty(); bool full(); int pop(); void push(int x); int peek(); private: IntStack(); //Don't allow use int size, top, //top points to the first free location *stk; void error(char *mess); }; Also assume that the class IntQueue has been similarly defined.
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