Name: _____________________________________________	Score: ____________


		     Mathematics 1201: Programming in C
		   Final Examination  -- December 13, 1999
			     Prof.  Wickerhauser


You may use your textbook, your homework sets and midterms, and your
calculator.


In Problems 1--7 below, find the value of `x' after all of the statements
are executed.  Assume all standard library function calls succeed:

Problem 1.	int x = 12, y = 5;
		x /= y-- + 2;

Problem 2.	int i, x;
		for ( x = i = 3; i; i-- ) x += 0xa;

Problem 3.	struct {
		   int d;
		   float or[4];
		} Gvf = {3,{5,6,7,8}};
		int x;
		x = Gvf.d + Gvf.or[1];

Problem 4.	#define QVPZ(x,y) (((y)*(y))%(x))
		x = QVPZ(6,3);

Problem 5.	int i[] = {1,2,3,4,5,6,7,8,9,0};
		int x=2, *ptr = i;
		while ( *ptr<4 ) x += *ptr++;

Problem 6.	int x, a[100]={1};
		x = *(a + 1);

Problem 7.	#include <ctype.h>
		#include <stdio.h>
		FILE *in, *out;
		int x = 'f';
		out = fopen("myfile", "w");
		putc(toupper(x),out);
		fclose(out);
		in = fopen("myfile","r");
		x = getc(in);


In Problems 8 and 9, suppose that A and B are int's with A = 6 and B = -2.
Determine the value of the given expression:

Problem 8.	B-A/B+A

Problem 9.	++A*B--



In Problems 10 and 11 below, determine what the program prints:

Problem 10.	#include <stdio.h>
		int ByTwo( const int x, const int q ) {
		  return ( x%2 ) ? q : ByTwo( x/2, q+1 );
		}
		main(void) {
		  const int x = 28;
		  printf("ByTwo(%d)=%d\n", x, ByTwo(x, 0) );
		  return 0;
		}



Problem 11.	#include <stdlib.h>
		#include <stdio.h>

		typedef struct Item { int Value; struct Item *Next; } *Stack;
		Stack Push ( int Value, Stack Old ) {
		  Stack New;
		  New = (Stack)malloc(sizeof(struct Item));
		  New->Value = Value;	  New->Next = Old;
		  return New;
		}
		Stack Pop ( Stack Old ) {
		  Stack New = 0;
		  if(Old) {
		    New = Old->Next;
		    free(Old);
		  }
		  return New;
		}
		int TopValue( Stack Top ) {
		  if(Top) return Top->Value;
		  else return 0;
		}
		main(void) {
		  int i, x;
		  Stack S;
		  for(i=0; i<15; i++) S = Push( i, S );
		  for(i=0; i<11; i++) S = Pop(S);
		  x = TopValue(S);
		  printf("x=%d\n", x);
		  return 0;
		}



Problem 12.

Write a complete ANSI C program that (1) reads floating-point numbers from a
file named ``accounts'', separated by whitespace, exiting if the file can't
be read for any reason, (2) sums the positive numbers, (3) sums the negative
numbers, (4) counts the zeroes, and (5) prints the count and the two sums
with two decimal places of accuracy to standard output with identifying text.