COMP1604 COMPUTER SCIENCE, AUTUMN EXAMINATIONS 2004

SOLUTIONS

1.(a) True

  (b) True

  (c) False (e.g. could have run-time errors)

  (d) False (must start with a letter or _)

  (e) first

  (f) condition is false

  (g) i is 9
      i is 4
      i is 1
      i is 0

  (h) Syntax errors, run-time errors, and logic errors.

  (i) correct answer is (i-2)  it returns a floating-point value to the calling function.

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

  (k) result is 4

  (l) correct answer is (l-3)  arr[0]*arr[1]

  (m) False (compiles ok, up to programmer to not access
       memory locations that are not part of the array)

  (n) a is 3, b is 3

  (o) x is 16 and y is 4

  (p) value is 4.3

  (q) True

  (r) I-hope-to-do-well-on-this-Exam.

  (s) False (other ways include end-of-file indicator
       and First line tells the number of data “records”
       that follow).

  (t) correct answer is (t-1)  emp1.id_number = 2123;

2.(a) int i;
      char string[100];
      /* assume string[] is somehow filled with letters, digits, etc */
      for (i=0; string[i]!='\0'; i++){
         if (string[i] == '0'){
            printf("%c", string[i]);
         }
      }

  (b) int v;
      /* suppose a value is now entered for v - code not shown */
      switch(v) {
        case 5: printf("positive\n"); break;
        case -5: printf("negative\n"); break;
        case 0: printf("zero\n"); break;
        default: printf("incorrect value entered\n"); break;
      }

  (c) int num_pos(int array[], int size){
         int i, k=0; /* i is a local loop counter */
         for (i=0; i<size; i++){
            if (array[i]>0){
               k++;
            }
         }
	 return (k);
      }

3.(a) LINE 1: scanf("%d", intarr+i);
      LINE 2: total += *(intarr+i);

  (b) #include "stdio.h"
      void main(void){
	  char message[80]="I love C programming";
	  int c_counter(char str[]); /* function prototype */
	  /* or: put c_counter() before main() */
	  printf("\"%s\" contains %d c's\n", message, c_counter(message));
	}
	int c_counter(char s[]){ /* no need to pass in size of array */
	  int i=0, ct=0; /* local variables to c_counter() */
          while (s[i]!='\0'){
            if ((s[i]=='c') || (s[i]=='C')){
               ct++;
            }
            i++;
          }
	  return ct;
	}