CS228 QUIZ 1 SOLUTION
			---------------------

1. correct answer	3 pts
   correct tree		2 pts(approximately correct 1pt)

   Answer: 
   (i)        -
            /   \
           +     /
         /   \ /   \
        %    * 6    2
       / \  / \
      3  2 5   2
 
   (ii) 8

2. basic structure	3 pts
   "break"		1 pt
   syntax		1 pt 

   Answer:
	...
	switch(n){
	    case 1:
		cout << "You are number ONE\n";
		break;
	    case 2:
		cout << "You are number TWO\n";
		break;
	    default:
		cout << "You did not win the contest\n";
		break;
	}

3. "include"		1 pt
   while loop		2 pts
   for loop		2 pts
   declare, init...	2 pts
   correctness		3 pts

   Answer:
	#include <iostream.h>

	int main()
	{
	    int num = 0, sum = 0;
	    cout << "Enter number to be summed(1 to num, negative to quit)\n";
	    cin >> num;
	    while(num >= 0){
		sum = 0;
		for(int i = 0; i <= num; i++)
		    sum += i;
		cout << "The sum of the numbers from 0 to " << num
		     << "is equal to " << sum << endl;
		cout << "Enter next number, negative to quit";
		cin >> num;
	    }
	    cout << "BYE!" << endl;
	    return 0;
	}

4. how many times	2 pts
   output		3 pts
   Answer:	times: 6	output: IENLPA