COMP1604 COMPUTER SCIENCE, SUMMER EXAMINATIONS 2004

SOLUTIONS

1.(a) True

  (b) False (programmer can find out but not decide which
       memory location is used - the computer decides this)

  (c) True

  (d) value of w is 6

  (e) no match

  (f) condition is true

  (g) i is 10
      i is 1
      i is 0

  (h) j is 3
      j is 2
      j is 1

  (i) False

  (j) correct answer is (j-3)  fn() takes 1 argument of type
       pointer-to-int and does not return a value.

  (k) result is 50

  (l) correct answer is (l-1)  arr[0]*arr[2]

  (m) True

  (n) a is -4, b is -4

  (o) x is 5 and y is 4

  (p) value is 2.20

  (q) False (need an array of type char with a size of at
       least 12 characters to store this 11-char string)

  (r) str=I Hope To Do Well On This Exam.

  (s) correct answer is (s-3)  a value outside the range
       of actual data values indicating that the end of
       the data has been reached.

  (t) correct answer is (t-1)  emp1.age = 47;

2.(a) int sum = 0, i;
      for (i=1; i<= 5; i++) {
        sum = sum + i;
      }

  (b) char f;
      /* suppose a value is now entered for f - code not shown */
      switch(f) {
        case ‘u’: printf("unleaded petrol\n"); break;
        case ‘p’: printf("premium petrol\n"); break;
        case ‘d’: printf("diesel\n"); break;
        default: printf("incorrect value entered\n"); break;
      }

  (c) int zerofinder(int A[], int size) {
	  int j;
	  for (j=0; j<size; j++) {if (A[j]==0) {return j;}}
	  return -1; /* 0 value not found, since for loop completed */
      }

3.(a)	#include "stdio.h"
	void main(void){
	  char message[80]="I like C programming";
	  int numblanks(char str[]); /* function prototype */
	  /* or: put numblanks() before main() */
	  printf("\"%s\" has %d spaces\n", message, numblanks(message));
	}
	int numblanks(char s[]){ /* no need to pass in size of array */
	  int i=0, count=0;
	  while (s[i]!='\0'){
	     if (s[i]== ' '){ /* test for blank space */
	       count++;
             }
             i++;
	  }
	  return count;
	}

  (b)(i) After executing this program, the file output.dat contains 0 2 6 

     (ii) #include <stdio.h>
 	  void main(void)
 	  {
	   FILE *fptr1, *fptr2;
	   int inp;
	   fptr1 = fopen("input.dat", "r");
	   fptr2 = fopen("output2.dat", "w");
	   while (fscanf(fptr1, "%d", &inp)==1){
	      if (inp >= -1 && inp <= 4){
	         fprintf(fptr2, "%d ", inp);
	      }
	   }
	   fclose(fptr1);
	   fclose(fptr2);
	  }