COS1511

COS1511 EXAM PACK
2025

QUESTIONS AND
ANSWERS
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COS1511/201/1/2020




Tutorial letter

Introduction to Programming I
COS1511

Semester 1

School of Computing




This tutorial letter contains the discussion of the solutions to assignment 3 semester 2.

, lOMoARcPSD|50013335




COS1511/201




Question 1

Which of the following is a valid variable name?

1. sixty_four
2. 64set
3. 6_set
4. dollar$

Correct option: 1

฀ Options 2 and 3 are incorrect because a variable name cannot start with a numerical value.
฀ Option 4 is incorrect because a variable name may not contain an ampersand character.


Question 2

Which of the following is not a valid variable name?

1. myInt
2. myDouble
3. sumOf4
4. return

Correct option: 4

฀ Options 4 is correct as return is a reserved word in C++ and cannot be used as a variable name.
฀ Options 1, 2 and 3 are all valid variable names.




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2

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COS1511/201




Question 3

What is the value of xafter the following statements?

int x, y, z;
y = 10;
z = 3;
x = y * z - 3;

1. 0
2. 3
3. 10
4. 27

Correct option: 4

Options 4 is correct as *has precedence over +:

x = y * z - 3
x = 10 * 3 - 3
x = 30 - 3
x = 27

You can also include brackets for easier readability:

x = (y * z) - 3
x = (10 * 3) - 3
x = 30 - 3
x = 27




Question 4

What is the value of xafter the following statements?

int x;
x = 0;
x = x * 13;

1. 0
2. 13
3. 34
4. not defined

Correct option: 1

Options 2 is correct as the integer value 0is assigned to xand thus it is addition between two integer values.

x = x * 30
x = 0 * 30
x = 0




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3