Chapter 2

Question 1

1. You want to declare an integer variable called myVar and assign it the value 0. How can you accomplish this?
   a. declare myVar as 0;
   b. myVar = 0;
   c. int myVar = 0
   d. int myVar = 0;

Answer 1

b. myVar = 0;

Question 2

2 You need to make a logical comparison where two values must return true in order for your code to execute the correct statement. Which logical operator enables you to achieve this?

a. AND
b. |
c. &
d. &&

Answer 2

d. &&

Question 3

3. What kind of result is returned in the condition portion of an if statement?
   a. Boolean
   b. Integer
   c. Double
   d. String

Answer 3

a. Boolean

Question 4

4. What are the keywords supported in an if statement?
   a. if, else, else-if, return
   b. if, else, else if
   c. if, else, else if, break
   d. if, else, default

Answer 4

b. if, else, else if

Question 5

5. In the following code sample, will the second if structure be evaluated?
   bool condition = true;

               if(condition)
                  if(5

Answer 5

a. Yes

Question 6

6. If you want to iterate over the values in an array of integers called arrNumbers to perform an action on them, which loop statement enables you to do this?
   a. foreach (int number in arrNumbers)
   {
   }
   b. for each (int number in arrNumbers)
   {
   }
   c. for (int i; each i in arrNumbers; i++)
   {
   }
   d. foreach (number in arrNumbers)
   {
   }

Answer 6

a. foreach (int number in arrNumbers)
{
}

Question 7

7. What is the purpose of break; in a switch statement?
   a. It causes the program to exit.
   b. It causes the code to exit the switch statement.
   c. It causes the program to pause.
   d. It causes the code to stop executing until the user presses a key on the keyboard.

Answer 7

b. It causes the code to exit the switch statement.

Question 8

8. What are the four basic repetition structures in C#?
   a. for, foreach, loop, while
   b. loop, while, do-for, for-each
   c. for, foreach, while, do-while
   d. do-each, while, for, do

Answer 8

c. for, foreach, while, do-while

Question 9

9.	How many times will this loop execute?
                int value = 0;
                do
                {
                   Console.WriteLine (value); 
                } while value > 10;
a.	10 times
b.	1 time
c.	0 times
d.	9 times

Answer 9

b. 1 time

Question 10

E1.	Which of the following is NOT a comparison operator?
a.	!=
b	=
c.	>
d.	<

Answer 10

b =

Question 11

E2. Which of the following is the correct syntax for executing the following statements in an if statement?
Console.WriteLine(“In an if statement”);
Console.WriteLine();
a.
bool condition = true;
if(condition)
Console.WriteLine(“In an if statement”);
Console.WriteLine();
Console.WriteLine(“Outside the if statement”);
b.
bool condition = true;
if(condition)
{
Console.WriteLine(“In an if statement”);
Console.WriteLine();
}
Console.WriteLine(“Outside the if statement”);
c.
bool condition = true;
if(condition)
{
Console.WriteLine(“In an if statement”);
Console.WriteLine();
Console.WriteLine(“Outside the if statement”);
}
d.
bool condition = true;
if(condition)
{
Console.WriteLine(“In an if statement”);
}
Console.WriteLine();
Console.WriteLine(“Outside the if statement”);

Answer 11

b.
   bool condition = true;
    if(condition)
    {
         Console.WriteLine("In an if statement");
         Console.WriteLine();
    }
    Console.WriteLine("Outside the if statement");

Question 12

E3. Which of the following looping structures must end with a semicolon?

a. for
b. foreach
c. do-while
d. while

Answer 12

c. do-while

Question 13

E4. How do you handle multiple switch statements with one condition in a switch structure?
a. Remove the colon after the condition.
b. Enclose all the code statements you want executed together in curly braces.
c. Create separate switch statements.
d. Omit the break; statement.
structure?

Answer 13

d. Omit the break; statement.

structure?

Question 14

E5. In a for statement, when does the incrementing of the counter take place?

a. On the last iteration only
b. At the end of each iteration
c. On the second and subsequent iterations only
d. At the end of the iteration and after the comparison

Answer 14

b. At the end of each iteration

Question 15

E6. When can you assign a value to a variable?

a. During creation only
b. Only runtime in code
c. During declaration
d. Only at design time when writing the code

Answer 15

c. During declaration

Question 16

E7. How can you tell when a statement has ended in C#?

a. Using the end of line character
b. Using the carriage return character
c. Using the colon
d. Using the semicolon

Answer 16

d. Using the semicolon

Question 17

E8. What is a declaration statement used for in C#?

a. To declare a variable name
b. To declare a variable name and data type
c. To declare the beginning of program execution
d. To declare the beginning of a function

Answer 17

b. To declare a variable name and data type

Question 18

E9. Which of these is not a valid C# statement?

a. ;
b. int myVar;
c. string string;
d. Console.WriteLine(“Hello world”);

Answer 18

c. string string;

Question 19

E10. What is one common characteristic of complex statements?

a. They contain only complex statements.
b. They enclose statements in curly braces.
c. They enclose statements in parentheses.
d. They use tabs and other white space to tell the compiler where statements start and end.

Answer 19

b. They enclose statements in curly braces.

Question 20

E11. In a complex if, else if structure, what keyword can be used to denote the final condition?

a. end if
b. endif
c. default
d. else

Answer 20

d. else