Mathematics 1201: Programming in C
		      Model Solutions to Midterm Test 2
			     Prof. Wickerhauser


In Problems 1--6 below, find the value of `x' after all of the following
statements are executed:

Problem 1.	#define HUH(x,y) ((x)>(y)?#x:#y)
		x = HUH(5,-7);				ANSWER 1:  "5"

Problem 2.	int i[]={4,3,2,1,0,-1}, *ptr, x=1;
		ptr = i;
		while ( *ptr ) x *= *ptr++;		ANSWER 2:  24

Problem 3.	float x, array[99] = {-12};
		x = array[12];				ANSWER 3:  0.000000

Problem 4.	int x, a[10];
		x = &a[2] - a;				ANSWER 4:  2

Problem 5.	#include <ctype.h>
		int x = 'e', y = '\t';
		x =  isspace(y) ? toupper(x) : 0;	ANSWER 5:  'E'


Problem 6.	typedef struct Link { int Value; struct Link *Next; } *Link;
		int i;
		Link Old=0, New;
		for(i=0; i<100; i++) {
		  New = (Link)malloc(sizeof(struct Link));
		  New->Next = Old;
		  New->Value = i;
		  Old = New;
		}
		for(i=0; i<5; i++)
		  New = New->Next;
		x = New->Value;				ANSWER 6:  94

Problem 7.

Write a complete ANSI C program that reads characters from the standard input
until it reaches the end-of-file marker, then returns the number of
semicolons read.  Be sure to include all the needed standard header files.

ANSWER:	#include <stdio.h>
	main(void)
	{
	  int count=0, Ch;
	  while ( (Ch=getchar()) != EOF ) if( Ch==';' ) ++count;
	  puts("Midterm Test, Problem 7: ");
	  printf("%d semicolons in the file.\n", count);
	}