Com S 541 -- Programming Languages I			Feb. 17, 1993
		HOMEWORK 7: Parameters (CP, Chapter 5)

Due: February 19, 1993 (extra credit due Feb. 24)

Do ONE of the following exercises:

1. All parameters in C are passed by value.  (Really, this is the truth.)
But it seems that arrays in C are passed as variable parameters.
For example, the function

void swap (int a[], i, j) {
  int temp;
  temp = a[i];  /* this assigns a[i] to temp */
  a[i] = a[j];
  a[j] = temp;
}

Definitely swaps two elements of an array (provided i and j are legal
indices of the array).  So this seems just like VAR parameters in Pascal.
Explain this apparent paradox using the terminology and
concepts discussed by Watt.  (That is, don't just quote the C reference
manual.)

2. Do problem 5.10 (about parameter passing in Ada).

		EXTRA CREDIT
Do one or more of problems 5.3, 5.4, 5.5, or 5.11.