Mid term sem 2 1415 sol

INTERNATIONAL ISLAMIC UNIVERSITY MALAYSIA

MID-TERM EXAMINATION

SEMESTER 2, 2014/2015 SESSION

KULLIYYAH OF INFORMATION AND COMMUNICATION TECHNOLOGY

Programme : BIT Level of Study : Undergraduate

Time : 10.00 a.m. – 12.15 p.m Date : 13th

March 2015

Duration : 2 Hours and 15 Minutes

Course Code : CSC1100 Section(s) : All

Course Title : Elements of Programming

This Question Paper consists of 17 Printed Pages including cover page containing 4 sections

Section 1: Multiple-Choice (10 questions)

Section 2: Fill-in-the-blank (10 Questions)

Section 3: Short Answers (3 Questions)

Section 4: Programming (1 Question)

You are required to answer ALL questions.

You are allowed to bring a calculator into the exam hall.

INSTRUCTION(S) TO CANDIDATES

DO NOT OPEN UNTIL YOU ARE ASKED TO DO SO

ANSWER ALL QUESTIONS IN THIS QUESTION PAPER

YOU ARE ONLY ALLOWED TO ASK QUESTIONS DURING THE FIRST 15

MINUTES OF THE EXAMINATION PERIOD

Any form of cheating or attempt to cheat is a serious offence, which may lead to dismissal.

Name:

Matric No:

Section:

Lecturer’s Name:

Page 2 of 16

SECTION 1: Multiple-Choice

Circle the correct answer in this question paper [1 marks x 10 = 10 marks].

1. Which of the following is NOT TRUE about C++ ?

a. C++ is an extension of the C language

b. C++ is a low-level programming language

c. C++ is an object-oriented language

d. C++ is a high-level programming language

2. When a declaration statement is used to store a value in a variable, the variable is said to

be ______.

a. created c. initialized

b. declared d. referenced

3. The C++ statement ‘cout << (6 + 15);’ yields the result ____.

a. 6 + 15 c. (6 + 15)

b. 21 d. (21)

4. A data ____ is defined as a set of values and a set of operations that can be applied to

these values

a. type c. base

b. set d. dictionary

5. What will be the value of the variable n4 after running the following codes?

int main ()

{

int n1 = 3, n2 = 4, n4;

double n3 = 2.2;

n4 = (n1/n2) * n3 + abs(n1-n2);

cout << double(n4) << endl;

return 0;

}

a. 2.65 c. 1

b. 0.65 d. 0

Page 3 of 16

6. The use of default in a switch-case statement is to _______

a. exit from the program

b. exit from the case structure

c. cover unhandled possibilities

d. continue with the remaining case conditions

7. Which of the following is a valid call to a C++ cmath function?

a. sqr(9.0) b. ab(-y) c. exp(2.5) d. power(x,2)

8. What will be the output of the following code?

int main ()

{

int num = -5;

bool sign = false;

for(int i = 1; i <= 4; i++)

{

if (sign && num > 0) {

cout << ++num << endl;

break;

}

else if (!sign || num < 0) {

cout << --num ;

continue;

}

else

cout << num++ ;

}

return 0;

}

a. -4 c. -5-4-3-2

b. -5-6-7-8

d. -4-3-2-1

9. If an expression is false to begin with, then !expression is true and evaluates to a

value of ____.

a. 0 c. 2

b. 1 d. 3

Page 4 of 16

10. Using nested if statements without including _______ to indicate the structure is a

common programming error.

a. parentheses c. braces

b. quotation marks d. switches

SECTION 2 : Fill-in-the-blank

Choose the correct term from the box given below and complete each of the following

statement. Write your answers in the blank column next to each statement .

[1 marks x 10 = 10 marks]

namespace main( ) robust compound pre-processor

sentinel pseudocode relational compiler

loader class algorithm sizeof( )

i. _______ is the file accessed by compiler when looking

for prewritten classes or functions pre-processor

ii. A _______program detects and responds effectively to

unexpected user inputs. robust

iii. The ______ operator determines the amount of storage

reserved for a variable. sizeof( )

iv. An _______ is a procedure or step by step sequence of

instructions to perform a computation in a program algorithm

v. A _______ places programs into main memory for

execution. loader

vi. In programming, a _______ is a special value that can be

used as a flag or signal to start or end a series of data. sentinel

vii. One or more individual statements enclosed within

braces is also known as a ______ statement. compound

viii. _________________ expressions are used to compare

operands. relational

ix. In object-oriented programming, a _______ is a set of

objects that share similar attributes. class

x. _______ forces the conversion of a value to another type casting

Page 5 of 16

SECTION 3: Short Answer Questions

Answer all questions in the spaces provided.

[40 marks]

Question 1: Short Answers

i. A source program, cannot be executed until it is translated into machine language. Draw

a diagram that demonstrates the process of program translation.

[2 marks]

ii. List down two important rules for evaluating arithmetic expressions.

[2 marks]

Both operands are integers: result is integer

One operand is floating-point: result is floating-point

iii. What is a symbolic constant? Provide a C++ example declaration of a symbolic constant

of type double.

[2 marks]

Symbolic constants are identifiers whose values cannot be changed throughout the

program.

Example:

const PI = 3.142 OR

#define PI 3.142

iv. Describe the meaning of an ‘infinite loop’ and a ‘fixed count loop’ in repetition.

[2 marks]

- An infinite loop is a loop with an expression that is always true and never ends.

- A fixed count loop is a loop with a tested expression which is a counter that

checks for a fixed number of repetitions.

Page 6 of 16

v. Explain with examples the three (3) types of logical operators in C++.

[5 marks]

AND operator, &&:

Compound condition is true (has value of 1) only if both conditions are true

Example: (age > 40) && (term < 10)

OR operator, || (double vertical bar):

Compound condition is true if either one of the expressions is true or if both

conditions are true

Example: (age > 40) || (term < 10)

NOT operator, !:

Changes an expression to its opposite state

If expression is true, then !expression is false

Question 2: Output Identification

Determine the outputs for the following code segments (assume all necessary predecessor

commands have been defined).

i. For the following codes, assume that the number entered is 42339.

[5 marks]

int main()

{

int num;

cout << "Enter a five-digit number: ";

cin >> num;

cout << num / 10000 << " ";

num = num % 10000;

cout << num / 1000 << " ";

num = num % 1000;

cout << num / 100 << " ";

num = num % 100;

cout << num / 10 << " ";

num = num % 10;

cout << num << endl;

return 0;

}

Page 7 of 16

ii. What is the printout of the following switch-case statement?

[3 marks]

int main()

{

int val = 22;

switch(val%3)

{

case 2: cout<< "Good, ";

break;

case 1: cout<< "Better, ";

case 0: cout<< "Best, ";

default: cout<< "Thank you!";

}

return 0;

}

4 2 3 3 9

Output:

Better, Best, Thank you!

Output:

Page 8 of 16

i. What is the output for the following codes?

[3 marks]

int main()

{

int x = 9, y=11;

if ( x < 10 )

if ( y > 10 )

cout << "%%%%" << endl;

else

cout << "#####" << endl;

cout << "$$$$$" << endl;

return 0;

}

ii. Determine the output of the following codes.

[4 marks]

int main()

{

int x, y;

for(x = 5; x >= 1; x--)

{

for(y = 6; y > x; y--)

{

cout << x + y;

}

cout << char('a' + 2) << endl ;

}

return 0;

}

%%%%

$$$$$

Output:

Page 9 of 16

Question 3: Find and correct the error(s) in the following programming statements:

i.

1

2

3

4

5

6

7

8

9

10

11

12

#include <iostream>

using namespace std;

int main ()

{

int a = 1; b = 2;

double c;

c = (a + b) * 2 + (a - b)/2;

cout >> c >> endl;

return 0;

}

[3 marks]

11c

109c

987c

8765c

76543c

Output:

Line No. Correction 5 int a=1, b=2;

9 cout << c << endl;

Page 10 of 16

ii.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

int main()

{

int a, b, c;

cout << "Enter 3 numbers: ";

cin >> a >> b >> c;

if ( c * c = a * a + b * b )

cout << The are 3 numbers

<< endl;

if else

cout << "THERE ARE 3 NUMBERS"

<< endl;

return 0;

}

[3 marks]

iii.

1 #include <iostream>

2

3 using namespace std;

4 int main()

5 {

6 float average;

7 average = 45/2.0;

8 cout << setw[6] << setfill('*') << average << endl;

9

10 if (average = 22.5)

11 cout << setiosflags(ios::showpoint) << average

12 << endl;

13 cout << setprecision(2) << average << endl;

14 return 0;

15 }

Line No. Correction

6 if ( c * c == a * a + b * b )

7 cout << "The are 3 numbers" 9 else

Page 11 of 16

[6 marks]

SECTION 4: Programming Question

Answer all questions in the spaces provided.

[25 marks]

Question 1:

In Japan, vending machines are not only used to buy drinks or snacks, but also to buy books or

magazines. You are required to create a C++ program that acts as vending machine that is able

to dispense novels, magazines and newspapers. Each category of item consists of 3

different titles to be represented by any characters between a-z (ie., name the titles as ‘a’, ‘b’,

‘c’, etc….). Given that the initial number of items in all categories is 9 units (3 units for each

item), use the ‘while’ and ‘switch-case statements to perform the following:

a. Draw a simple flow chart for your program (refer to the relevant symbols in the

attachment)

b. Your program should prompt the user to enter the amount of items they want to

purchase (e.g, entering 5 means user can buy 5 items in any combination of categories)

and display the titles selected (you may just use a cout for titles).

c. Your program should calculate the total price to be paid for all items purchased by

the user at the end of the program.

Line No. Correction

2 #include <iomanip>

6 cout << setw(6) << setfill('*') << average << endl;

10 if (average == 22.5) {

13 cout << fixed << setprecision(2) << average << endl; }

Page 12 of 16

d. Once an item in each category is purchased, the number of items will decrease by one.

Your program should be able to print the balance of each category of item at the end of

the program.

The following is the sample output of your program:

Please enter number of items: 2

Item 1

Choose the type of item (1 – novel, 2 – magazine, 3 – newspaper) : 1

Enter title : ‘a’

You have selected the novel “In the eyes of the night”

The price of this item is RM 10.

Item 2

Choose the type of item (1 – novel, 2 – magazine, 3 – newspaper) : 3

Enter title : ‘z’

You have selected the newspaper “The New Straits Time”

The price of this item is RM 2.50.

Total price of all items is RM 12.50

Balance for novel is 2

Balance for newspaper is 2

Press any key to continue . . .

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

Page 13 of 16

Flowchart (Simplified)

Start

Input

numItem

Compute

balance = balance-1

count < numItem

Input

category

category is

1 or 2 or 3

title between

‘a’-‘z’

Input title

Compute

totalPrice = totalPrice + price

End

Display totalPrice,

balance

true

false

false

false

true

true

Display

title, price

Page 14 of 16

//Solution Midterm Exam (S4)

#include <iostream>

#include <iomanip>

using namespace std;

int main()

{

int limit,count;

bool select1=false,select2=false,select3=false;

double totalp = 0.0,p_novel,p_mag,p_news,priceCat = 0.0;

int balance1 = 3, balance2 = 3, balance3 = 3;

int category;

char title;

cout << "************************************************" << endl;

cout << "Books & Magazines Vending Machine\n " << endl;

cout << "Please enter the number of items you wish to purchase: " ;

cin >> limit;

count = 1;

while (count <=limit)

{

cout << "\nItem " << count << endl;

cout << "Please enter the category of item to purchase\n" ;

cout << "Press '1' for novels\n" ;

cout << "Press '2' for magazines\n" ;

cout << "Press '3' for newspapers\n\n" ;

cin >> category;

switch(category)

{

case 1:

cout << "You have selected 1 for novels\n";

cout << "Select 'a' for : In the eyes of the night\n";

cout << "Select 'b' for : I love Programming, not!\n";

cout << "Select 'c' for : Exam, exam, go away...\n";

cin >> title;

select1 = true;

switch(title)

{

case 'a': case 'A':

p_novel = 10.00;

cout << "You have selected the novel 'In the eyes "

<< "of the night'\n";

cout << "The price of the novel is RM " << fixed

<< setprecision(2) << p_novel << endl;

break;

case 'b': case 'B':

p_novel = 12.00;

cout << "You have selected the novel 'I love "

<< "Programming, not!' " << endl;

Page 15 of 16



break;

case 'c': case 'C':

p_novel = 8.50;

cout << "You have selected the novel 'Exam, exam, "

<< "go away...' " << endl;



break;

default:

cout << "Wrong selection, please try again..."

<< endl;

continue;

}//inner switch1

balance1 = balance1 - 1 ;

priceCat = p_novel;

break;

case 2:

cout << "You have selected 2 for magazines\n";

cout << "Select 'j' for : Home Improvement\n";

cout << "Select 'k' for : Cooking with Madam\n";

cout << "Select 'l' for : Programming Bits and Bytes\n";

cin >> title;

select2 = true;

switch(title)

{

case 'j': case 'J':

p_mag = 5.00;

cout << "You have selected the magazine 'Home "

<< "Improvement' " << endl;

cout << "The price of the magazine is RM "

<< fixed << setprecision(2) << p_mag << endl;

break;

case 'k': case 'K':

p_mag = 7.00;

cout << "You have selected the magazine 'Cooking "

<< "with Madam' " << endl;



break;

case 'l': case 'L':

p_mag = 6.50;

cout << "You have selected the magazine "

<< "Programming Bits and Bytes' " << endl;

Page 16 of 16



break;

default:


<< endl;

continue;

} //inner switch2

balance2 = balance2 - 1;

priceCat = p_mag;

break;

case 3:

cout << "You have selected 3 for newspapers\n";

cout << "Select 'x' for : Berita Harian\n";

cout << "Select 'y' for : New Straits Time\n";

cout << "Select 'z' for : Utusan Malaysia\n";

cin >> title;

select3 = true;

switch(title)

{

case 'x': case 'X':

p_news = 1.50;

cout << "You have selected the newspaper 'Berita "

<< "Harian' " << endl;

cout << "The price of the newspaper is RM "

<< fixed << setprecision(2) << p_news

<< endl;

break;

case 'y': case 'Y':

p_news = 2.00;

cout << "You have selected the newspaper 'The New "

<< "Straits Time' " << endl;


<< fixed << setprecision(2) << p_news

<< endl;

break;

case 'z': case 'Z':

p_news = 1.80;

cout << "You have selected the newspaper 'Utusan "

<< "Malaysia' " << endl;


<< fixed << setprecision(2) << p_news << endl;

break;

default:


<< endl;

Page 17 of 16

continue;

} //inner switch 3

balance3 = balance3 - 1;

priceCat = p_news;

break;

default:

cout << "Wrong selection, please try again..." << endl;

continue;

} //outer switch

totalp = totalp + priceCat;

count++;

} // end while

cout << "\nThe total price for your items is: " << fixed

<< setprecision(2) << totalp << endl ;

if (select1 == true)

cout << "Balance for novels is now: " << balance1 << endl;


cout << "Balance for magazines is now: " << balance2 << endl;


cout << "Balance for newspapers is now: " << balance3 << endl;

cout << endl;

return 0;

}

- End of question –

Page 18 of 16

Attachment (Symbols for flow chart)

Education

Mid term sem 2 1415 sol