C# Test Preparation

Asya Georgieva

Telerik Software Academyacademy.telerik.com

QA Trainer

http://telerikacademy.com

Introduction to Programming

Question Indicate the incorrect purpose of the Framework Class Library (FCL)?a) Provides functionality for creating

console applicationsb) Provides functionality for creating

WPF and Silverlight rich-media applications

c) Provides functionality for creating iOS and Android applications

d) Provides functionality for creating Windows Forms GUI applications

e) Provides functionality for creating web applications (dynamic Web sites)

3

Question Indicate the incorrect purpose of the Visual Studio IDE?

a) Edit imagesb) Design user interfacec) Write code in many languagesd) Execute / test / debug applicationse) Browse help and webf) Edit excel documentsg) Manage project's files

4

Primitive Data Typesand Variables

Question

What will the following code result in?

6

char zero = '0';char one = '1';char two = '2';char three = '3';char four = '4';char five = '5';char six = '6';char seven = '7';char eight = '8';char nine = '9'; string ns = (nine + two + five).ToString();int n = ((nine - '0') * 10 + two - '0') * 10 + five - '0';Console.WriteLine(n == ns);

a) Trueb) Falsec) 925d) 1850e) Run-

time error

f) 0g) Compile

time error

Answer What will the following code result in?

7

char zero = '0';char one = '1';char two = '2';char three = '3';char four = '4';char five = '5';char six = '6';char seven = '7';char eight = '8';char nine = '9'; string ns = (nine + two + five).ToString();int n = ((nine - '0') * 10 + two - '0') * 10 + five - '0';Console.WriteLine(n.ToString() == ns);

int type should be converted

to string

Question

What will the following code result in?

8

int i = 0x10; int j = 0x2;Console.WriteLine(i<<j);

d) Compilation error

e)32f)64

a)1b)2c) Run-time

error

162

Question

What will the following code result in?

9

string str = @"\\//\""\'\""";Console.WriteLine(str);

e) \//"'"f) \\/"'"g) Compilation

errorh) Run-time

error

a) \\//\"\'\"b) \//"'"c) \/"'"d) \\//"'"

Question

What will the following code result in?

10

double a = 0.2;decimal b = 0.3m;Console.WriteLine(a+b);

d) Compilation error

e) Run-time error

a)0b)0.5c) null

Question

What will the following code result in?

11

string a = "1";long b = 1L;Console.WriteLine(b + a);

d)2e) Compilation

errorf) Run-time

error

a)11b)11Lc)1L1

Operators, Expressions

and Statements

Question What will the following code result in?

13

byte number = 0;for (int i = 0; i <= 32; i++){ number >>= i; for (int j = 0; j >= -32; j--) { number <<= Math.Abs(j); }}Console.WriteLine(number);

e)2f)255g) Compilation

errorh) Run-time error

a) 0b) 1c) Trued) False

0 shifted left/right is

always 0

Question What will the following code result in?

14

byte b1 = 1;int i1 = 2; int result1 = b1 << i1;int result2 = i1 << b1;int result3 = (i1 + b1) << (i1 - b1);Console.WriteLine("{0}, {1}, {2}", result1, result2, result3);

f) 4, 4, 6g) 6, 6, 6h) 0, 0, 0i) 1, 1, 1j) 4, 4, 2

a) 4, 6, 4b) 4, 6, 6c) 6, 6, 4d) 6, 4, 4 e) 4, 4, 4

Question What will the following code result in?

15

double first = 0.0f;double second = 0.0; for (int i = 0; i < 12; i++){ first += 0.1;} for (int i = 0; i < 4; i++){ second += 0.3;}Console.WriteLine(first==second);

a) 1b) 0 c) 2147483647d) –2147483647e) Truef) Falseg) Compile time

errorh) 3.402823E+38i) -3.402823E+38

1.2 1.2

Question What will the following code result in?

16

int n1 = 4;int n2 = 6;int n3 = 8;int result1 = n1 ^ n2 & n3;int result2 = (n1 ^ n2) & n3;int result3 = n1 ^ (n2 & n3); bool equal12 = result1 == result2;bool equal13 = result1 == result3;bool equal23 = result2 == result3;Console.WriteLine("{0}, {1}, {2}", equal12, equal13, equal23);

a) True, True, True

b) True, True, False

c) True, False, True

d) True, False, False

e) False, True, True

f) False, False, True

g) False, False, False

h) False, True, False

i) Compilation error

j) Run-time error

100110

1000

4

04

Bitwise AND has higher

priority than bitwise XOR

Question What will the following code result in?

17

int a = 3;int b = 5;int result = a+++ ++b;Console.WriteLine("{0} {1} {2}", ++a, b++, --result);

f)5 5 8g)5 6 8h)5 7 8i)5 7 9

a)4 6 9b)4 5 8c)4 6 8d)5 6 9e)Compilation

error

Console Input and Output

Question Indicate the correct statement for the following line of code?

19

Console.Write("Full line{0}", 1, 2);

a) The next print operation will result in a run-time error

b) The next print operation will start on the same line

c) This is an invalid method calld) This print operation will cause run-

time errore) This will cause compilation errorf) There is no Write(…) method in the

Console class

Question Which line of code should be used if we want to ensure that the decimal separator is "."?

20

a) Console.OutputEncoding = Encoding.UTF8;

b) Console.SetDecimalSeparator('.');c) Console.DecimalSeparator = '.';d) Console.CurrentCulture =

CultureInfo.InvariantCulture;e) double.Parse(1.2);f) Thread.CurrentThread.CurrentCulture

= CultureInfo.InvariantCulture;

Question

What will Console.ReadLine() return when there aren't any available lines to read?

a) ""b) "\0"c) '\0'd) nulle) Compile time errorf) Run-time error

21

Question How many consecutive intervals will

be printed between the two digits (1 and 2) after the execution of the following code?

22

int a = 1;int b = 2;Console.Write("{0,-10}{1,10}", a, b);

a) 0b) 20c) 14d) 10e) 18f) This code will cause run-time

error

Conditional Statements

Question What will the following code result in?

24

bool isTrue = true;bool isFalse = false;if (!!(!(isTrue && isFalse) || !(isTrue || isFalse))){ Console.WriteLine(isFalse);}else{ Console.WriteLine(isTrue);}

e) Compilation error

f) Runtime errorg) None of the

answers

a) falseb) True c) trued) False

Question What will the following code result in?

25

int i = 1;int j = 1;switch (i){ case 1: i = 1; break; case j: i = 2; break; case i: i = 3; break; default: i = 4; break;}Console.WriteLine(i);

a) 1b) 2 c) 3d) 4e) Compilation

errorf) Run-time errorg) None of the

answers

The case value must be a constant

Question What will the following code result in?

26

int number = 5;if (number++ == ++number){ Console.WriteLine(number + 1);}else{ Console.WriteLine(number + 2);}

e)9f)10g) Compilation

errorh) Run-time error

a)5b)6c)7d)8

Question What will the following code result in?

27

int? number = new int?();switch (number){ case 1: Console.Write(1); break; case 2: Console.Write(2); break; case 3: Console.Write(3); break; case null: Console.Write(4); break; default: Console.Write(5); break;}

a)1b)2 c)3d)4e) Compilation

errorf) Run-time errorg) None of the

answers

Loops

Question What will the following code result in?

29

int count = 0;for (int i = 1, j = 2; i < j; i++, j++){ count++; if (i == 3) i++; break;}Console.WriteLine(count);

e)4f) Compilation

errorg) Run-time errorh) Endless loop

a)0b)1c)2d)3

Question What will be printed on the console when the following code is executed?

30

string[] elements = { "ab", "12" };foreach (var e in elements){ foreach (var ch in e) { Console.Write(ch); } Console.Write(e);}

a) ab12b) 12abc) abab1212d) ab12ab12e) 12ab12abf) Endless

loopg) Run-time

errorh) Compilation

error

Question What will the following code result in?

31

int n = 4, f = 0;do{ f *= n; n--;}while (n > 0);Console.WriteLine(f);

f) 120g) Compilation errorh) Run-time errori) Endless loop

a) 0b) 4c) 6d) 12e) 24

Question

What will the following code result in?

32

for (int i = 1; i <= 4; i = i * 2){ Console.Write(i + " ");}

f) 1 2 4g) Compilation

errorh) Run-time errori) Endless loop

a) 1 2b) 2 4 6c) 2 4 8d) 1 2 3e) 1 2 3 4

Question

What will the following code result in?

33

int sum = 0;while (sum < 10) for (int i = 0; i <= 2; i++) sum += i;Console.WriteLine(sum);

e) 12f) Compilation

errorg) Run-time errorh) Endless loop

a) 0b) 9c) 10d) 11

Question*** Try your luck! What will be written on the console when the following code is executed?

34

int toto = 1;for (int i = 2; i <= 4; i++, toto++){ for (int j = i - 1; j < i + 1; j += 2, toto += i < j ? 1 : -1) { toto <<= 2; }}Console.WriteLine(toto - 57);

e)6f)35g)42h)49

a)-49b)-42c)-35d)5

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C# Test Preparation

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