Question

For each of the questions that follow, fill in the blanks. Blanks are denoted by --[N.]--, where N is an upper-case Roman numeral.

(a) Complete the following code so that the loop executes 10 times (3) int j = −−[I.]−−;

int i=1;

while ( −−[II.]−− ) {

i = i + −−[III.]−−; }

(b) Complete the following function which sorts C-strings into alphabetic order. (4)

Page 4

void bubbleSort( char names[ ][COLS] , int count) {

int pass , index ;
char temp[COLS];
for ( pass = 0; pass < count; pass++ )

}

for ( index = 0; index < (count −1); index++ ) if ( −−[IV.]−− )

{

}

// swap t h e names

−−[V.]−− −−[VI.]−− −−[VII.]−−

(c) You are given the following incomplete program to test whether a given password is valid or not. The (6) rules for a valid password are given by:

1. A password must contain at least one lowercase letter, one uppercase letter and one decimal digit 2. The password length must be at least 7 characters.

int main() {

char∗ password ;
password = new char[250];

// Read the password

cin >> password;

//Test whether the password is valid

if (isValidPassword(password)) {

cout << ”The password complies with the rules” << endl; }

else

{

cout << ”The password does not comply with the rules” << endl; }

delete [ ] password ; return 0 ;

}

Complete the function to test for a valid password.

bool isValidPassword( const −−[VIII.]−−) {

const int MINLEN = 7;
int lowerCount = 0 , upperCount = 0 , digitCount = 0, index = 0; bool valid = false ;

−−−[IX.]−− (password[index] != ’\0’) {

if ( −−[X.]−− (password[index]) ) digitCount++;

else if ( −−[XI.]−− (password[index] )) lowerCount++;

else if ( −−[XII.]−− (password[index] )) upperCount++;

index++;

}

Page 5

if ((digitCount > 0) && (lowerCount > 0) && (upperCount > 0) && (strlen(password) >= MINLEN))

valid = true; −−[XIII.]−−

}

(d) Complete the following struct definition. (1)

struct Bus{
−−[XIV.]−− routeName ;

int routeLength ; };

5. (e) Given a struct (2)

   struct Cart {
   string material ;

   double volume ;

   int cap[3]; };

   and the following code

   int main() {

   Cart c = −−[XV.]−−; }

   Instantiate c with the following values: • tin

   • 70.3
   • {1,2,3}

6. (f) Use the following prompts to define a class Cube that contains information about a cube’s length and volume.

i. Complete the declaration for the Cube class by filling in the missing code statements. The class should (3) contain a public interface to modify and retrieve the length of the cube and to compute its volume.

class Cube {

−−[XVI]−− int length ;

−−[XVII]−− −−[XVIII]−− −−[XIX]−− −−[XX]−−

// access specifier

// access specifier
// setLength function prototype // getLength function prototype // getVolume function prototype

};

2. Implement the getVolume function to return the cube’s volume as follows: V = l3, where V and l are (2)

   the cube’s length and volume, respectively.

   int −−[XXI]−− {

   return −−[XXII]−− }

3. Why is it advisable to not have a variable volume to store the cube’s volume value? (1)

Answer 1

1.) set j = 10 and make i increment until it reaches j value.

int j = 10;

int i = 1;

while(i <= 10){

i = i+1;

}

2.) use strcmp to compare the string and strcpy() to swap string using temp variable.

void bubbleSort( char names[ ][COLS] , int count) {

int pass , index ;
char temp[COLS];
for ( pass = 0; pass < count; pass++ )

for ( index = 0; index < (count −1); index++ ) if (strcmp(names[index],names[index+1] < 0)

{

strcpy(temp, names[index+1]);

strcpy(names[index+1], names[index]);

strcpy(names[index], temp);

}

}

3.) use isdigit() to check for digits, islower() to check for lowercase, isupper() to check for uppercase

int main() {

char∗ password ;
password = new char[250];

// Read the password

cin >> password;

//Test whether the password is valid

if (isValidPassword(password)) {

cout << ”The password complies with the rules” << endl; }

else

{

cout << ”The password does not comply with the rules” << endl; }

delete [ ] password ; return 0 ;

}

Complete the function to test for a valid password.

bool isValidPassword( const char password[]) {

const int MINLEN = 7;
int lowerCount = 0 , upperCount = 0 , digitCount = 0, index = 0; bool valid = false ;

while (password[index] != ’\0’) {

if ( isdigit(password[index]) ) digitCount++;

else if (islower(password[index] )) lowerCount++;

else if ( isupper (password[index] )) upperCount++;

index++;

}

4.) declare busName as string

struct Bus{

string routeName ;

int routeLength ; };

5.) provide the initialzation value inside {} seperated by ,

struct Cart {
string material ;

double volume ;

int cap[3]; };

and the following code

int main() {

Cart c = {"tin", 70.3, {1,2,3}}; }

6.) decalre lenght under private and setlenght(), getLength(), getVolume() under public.

class Cube {

private:

int length ;

public:

void setLength(int l) ;

int getLength();

int getVolume();

// access specifier

// access specifier
// setLength function prototype // getLength function prototype // getVolume function prototype

};

make the funtion getVolume() return lenght*length*length

int getVolume() {

return length*length*length; }

it is not advisable to set another variable for volume, because it is a simple calcuation which can done without seperately allocating memory space for it.