Ms 2002 Ce Cs Paper Ibc C Version

Suggested Solutions to 2002 HKCEE Computer Studies Paper I Sections B & C (C Version) 6.

7.

Line Number 180 220 225 230 270 280 300 310 315 340 385

Step 1 Step 2 Steps 3, 4 & 5 Step 6 Step 7 Step 8 Step 9 Step 10 Step 11

line 40 line 60 lines 70, 80 and 90 lines 100, 110 and 180 line 120 line 130 line 140 line 150 line 160 line 170 #include <stdio.h>

00 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 8.

Program Statement char ch; DiskFile = fopen(FileName, "r"); TotalReplaced = 0; while ( !feof(DiskFile) ) fscanf(DiskFile, "%c", &ch); if ( ch == SearchChar ) printf("%c", ReplaceChar); TotalReplaced = TotalReplaced + 1; } while ( ch != '*' ); printf("\n");

(a)

1 1 1 1 1 1 1 1 1 1 1 Max 10 1 1 1 1 1 1 1 1 1 1

int main() { int former, latter, limit, cnt; scanf("%d", &limit); former = 1; latter = 1; cnt = 0; while ( former <= limit ) { printf("%d", former); latter = former + latter; former = latter - former; cnt++; if ( cnt % 6 == 0 ) printf("\n"); } return 0; } (i)

when Count equals 0, Ch = A, Tmp = A, P = A. when Count equals 0, Ch = B, Tmp = F, P = AF. when Count equals 0, Ch = L, Tmp = D, P = AFD. when Count equals 0, Ch = E, Tmp = U, P = AFDU.

1 1

SEC = AFDU.

1

2002-CE-COMP STUD 1B & C-1 (C Version)

(ii)

void Decode(char* P, char* C) { char Ch; char Tmp[2]; int Len, Count, Asc;

1

strcpy(C, ""); strcpy(Tmp, " "); Len = strlen(P); for ( Count = 0; Count < Len; Count++ ) { Ch = P[Count]; Asc = (int) Ch - A; Asc = (D * Asc) % N; Tmp[0] = (char) (Asc + A); strcat(C, Tmp); }

1

1 1

} (iii) (b) 9.

(a)

(b)

(c)

AWIK

1

Line 110 is changed to:

const int M = 5, D = 21, N = 26, A = 97;

void InputWords() { printf("Input the first English word: "); scanf("%s", word1); printf("Input the second English word: "); scanf("%s", word2); } void CheckLength() { if ( strlen(word1) != strlen(word2) ) match = false; } void ChangeUpper(char* st) { int i; for ( i = 0; i < strlen(st); i++ ) if ( st[i] >= 'a' && st[i] <= 'z' ) st[i] = st[i] - 'a' + 'A'; }

2002-CE-COMP STUD 1B & C-2 (C Version)

1+1

0.5 0.5

1+1

1

1 1

(d)

void CalFreq() { int i; for ( i = 0; i < strlen(word1); i++ ) { freq1[word1[i] - 'A']++; freq2[word2[i] - 'A']++; }

1 1

} (e)

void CheckMatching() { int i; for ( i = 0; i < 26; i++ ) if ( freq1[i] != freq2[i] ) match = false;

1 1

} 10.

(a)

(b) (c)

(i)

Web page browsers can be used.

1

(ii)

We can use data encryption to protect data from unauthorised access.

1

Data entry operator / programmer / web page designer (any two) could help Amy. 1. 2. 3.

(d)

Electronic mail service can provide 24-hour enquiry service. (time) Customers can make enquiries all over the world. / Customers are not necessary to visit the bookstore by person. (location) Staff can answer customers’ enquiries on batch./ Staff can answer similar enquiries quickly. (management)

1, 1 1 1 1

1. 2.

The web site can provide a search engine for customers to search books. (enquiry) The web site can provide online order/payment/reservation service for customers to order/buy books. (payment) 3. The web site can display new release books / top selling books / discounted books so that customers can collect more information about our store. (display) 4. The web site can provide a bulletin board / chat room for customers to feed back our services. (communication / customers’ opinion) (any three) 2, 2, 2

(e)

1. 2. 3.

Constructing the web site requires a high investment on web server development. (cost) Customers are not used to buy books online. (customers’ habit) There is a security risk on the Internet that affects customers to use the web site. (Internet security)

Effective communications: Relevance

0 / 1 /2

Language/Style correct and appropriate

0/1/2

0/1/2/3/4

2002-CE-COMP STUD 1B & C-3 (C Version)

1 1 1