CyberChallenge.IT 2017

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CyberChallenge.IT 2017 - Pretest

Demo of the pretest for the 2017 edition of CyberChallenge.IT

Additional material for other tests is available at the link https://cyberchallenge.it/training

Question 1

Given the following code:

What it is the return value of bar(24)?

1 point

BBBA

ABA

Stack overflow

BABA

BBBB

Clear selection

Question 2

Given the following code:

What does the program print?

1 point

Cannot tell: the behavior of the program is undefined

Clear selection

Question 3

How would you declare in C a “pointer x to an array of 10 pointers to a function that takes one int and returns a pointer to void”?

1 point

void* (*[10])(*x)(int)

void* (**x[10])(int)

void* (*(*x)[10])(int)

void* (**x)(int)[10]

void (*(*(*x[10])))(int)

Clear selection

Question 4

Given the following code:

What does the program print?

1 point

10 20

Segmentation fault

10 10

20 10

20 20

Clear selection

Question 5

Given the following code:

What is the output?

1 point

BazingaBazingaBazingaBazingaBazingaBazingaBazingaBazinga

BazingaBazingaBazingaBazingaBazingaBazingaBazinga

BazingaBazingaBazingaBazingaBazinga

BazingaBazingaBazingaBazingaBazingaBazinga

Clear selection

Question 6

Given the following code:

What is the output?

1 point

Cannot tell: the behavior of the program is undefined

Clear selection

Question 7

You are given this simple dynamically-sized linked list implementation.

Unfortunately, there’s a serious bug: in which function?

1 point

new_linked_list

delete_linked_list

append_elem

main

new_node

Clear selection

Question 8

Let y be a double in C and let x = (long)(y + 0.5).

Which of the following is correct?

1 point

x is the largest integer smaller than y

x is obtained by rounding y to the nearest integer

x-y is always equal to 0.5

x is equal to y if and only if y-0.5 is integral

x is the smallest integer larger than y

Clear selection

Question 9

Given the following code:

What is the output?

1 point

127

Infinite

126

255

Clear selection

Question 10

Given the following code:

What is the output?

1 point

Clear selection

Question 11

If you write down all the numbers from 300 to 400, how many times do you have to write the digit 3?

1 point

120

100

110

109

Clear selection

Question 12

There are 27 tennis balls. 26 of them have the same weight and the twenty-seventh is a bit heavier.

In the worst case scenario, what is the minimum number of weighings you need to identify the heavy one by using a two-pan balance scale?

1 point

Clear selection

Question 13

Pedro is a contestant on a “Deal or No Deal” game, and he’s given the choice of three boxes: inside one box is a one million prize, while the others are empty. He picks a box, say No. 1, and the host, who knows what’s inside the boxes, opens another box, say No. 3, which is empty. He then asks him, ”Do you want to pick box No. 2 instead?”

Is it to his advantage to switch his choice?

1 point

yes

it's the onion

it's the same

Clear selection

Question 14

A director wishes to know how many times their movie has been shown in a given theater. The theater’s staff provides the following info:

- at the first projection there’s just 1 viewer;

- at each projection, the number of viewers grows by 1 compared to the previous one;

- 820 tickets are sold over all the projections.

How many projections were held?

1 point

Clear selection

Question 15

You can paddle your canoe 7 miles per hour through any placid lake. You’re paddling through the Wabash river and the stream constantly flows at 3 miles per hour. The moment you start to paddle up stream, a fisherman looses one of his fishing bobbers in the water 14 miles up stream of you.

How many hours does it take for you to reach the bobber?

1 point

1.5

2.5

Clear selection

Submit

Clear form

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