CIS71, Section 4
FIVE MINUTE TEST #9
November 7, 2006




(10)	1. (a) We want to open the file temp.txt for input. Write
	       the necessary code.
	   (b) We want instead to write to temp.txt. Write the 
	       necessary code.








(10)	2. Given the definitions
		typedef struct Foo {int x; double y} foo;
	   Declare an array of 5 foo and initialize it to all 0s.










(10)	3. foo is as defined in question 2.
	   What is printed out by the following code
		void moo(foo a) { a.x = 3; a.y = 2.7; }
		foo b = {1, 3.1};
		moo(b);
		foo c = b;
		printf("b.x=%d, b.y=%lf, c.x=%d, c.y=%ld\n",
			b.x, b.y, c.x, c.y);





(10)	4. foo is as defined in question 2.
	   Write the function
		void avg(int n, foo a[n])
	   which prints out the average value of the x filed and the average 
	   value of the y field for the elements in array a.