Reference no: EM131119666
1. Set a variable to a value with the symbol _____, and test equality with _____.
=, =
==, ==
=, ==
==, =
2. In the context of object-oriented programming, the Solution Explorer window _____.
exposes the properties of the control
shows the physical components of the program
lists the events associated with a control
lists the controls on the form
3. C# comments are represented by which characters?
// and /* */
:: and //
// and >>
>
4. Your C# program needs to store a single alphanumeric character the user will enter. When your program starts, the default setting for that character should be the letter A. You implement this functionality by writing _____.
char myVar = A;
char myVar = ‘A';
char myVar(‘A');
char myVar(A);
5. What will be the output of this statement?
Console.WriteLine("\"to be or not to be\"");
"to be or not to be"
\"to be or not to be\"
\ to be or not to be \
to be or not to be
6. Before you start writing a program, it's important to first thoroughly _____.
analyze the problem
design the solution
specify the problem
All of the above
7. C# decision structures include _____ and _____.
IF, IF/ELSE
IF, FOR
FOR, FOREACH
FOR, WHILE
8. The following C# code _____ compile; however, it contains a _____ error.
int x = 15, y = 10;
if (x < y);
Console.WriteLine("x is less than y");
will, compiler
will, logical
will not, compiler
will not, logical
9. In this code, the variable _____ is a counter and the variable _____ is an accumulator.
double sum = 0, height = 2.0, stop =10, max = 50;
int track = 0, num = 0;
while (num <= stop)
{
sum = sum + height * num;
if (sum <= max)
track++;
num++;
}
num, track
sum, track
track, sum
height, stop
10. What output will this set of statements produce?
int a = 10;
while (a <= 10)
{
Console.Write("{0}\t", a);
a--;
}
Console.Write("{0}\t", a);
An infinite loop
An exception
10
10 10
Part 2
1. Because Main() and MyFunction() store counter in _____, the output of this code will be _____.
static void Main()
{
int counter = 8;
Console.Write("{0} ", counter);
counter++;
MyFunction(ref counter);
counter++;
Console.Write("{0} ", counter);
Console.Read();
}
public static void MyFunction(ref int counter)
{
Console.Write("{0} ", counter);
counter++;
}
different memory locations, 8 9 10
the same memory location, 8 9 10
different memory locations, 8 9 11
the same memory location, 8 9 11
2. Which is a valid name for a method or function?
mthd1
1_mthd
MyMthd@1
1mthd
3. Which is a correct heading for a method that returns the difference between two given doubles?
public static void CalcDiff(double price1, double price2);
public static double CalcDiff(double price1 , anotherPrice)
public static double CalcDiff(double price1 , double price2);
public static CalcDiff(double price1, double price2);
4. A(n) _____ is a notification from the _____ that an action has occurred, such as a mouse click or a key press.
event, GUI application
console application, operating system
GUI application, event
event, operating system
5. Which of the following statements will retrieve the selected item of comboBoxEntrees and place it in a myString variable called "myStr"?
myString myStr = comboBoxEntrees.SelectedItem;
myString myStr = comboBoxEntrees.Selection();
myString myStr = comboBoxEntrees.Text;
myString myStr = comboBoxEntrees.getText();
6. Because a _____ inherits members from the _____ class, it has the methods Show() and Hide().
Button, Control
Form, Control
RadioButton, ComboBox
TextBox, Form
7. Given the following declaration, what is/are the value(s) of inches[1,1]?
double[,] inches = { {2.25, 3.25, 4.5, 7.25},
{3.75, 4.75, 3.5, 3.75} };
2.25
2.25 3.75
3.25 4.75
4.75
8. An array is a list of data items that _____.
are all integers
are not indexed
have different names
share the same data type
9. To delete a specified number of characters from a String, use its _____ method.
Delete();
Concat();
Insert();
Remove();
10. To print out the time a file called "timeSheet.txt" was created, write _____.
Console.WriteLine(File.GetCreationTime("timeSheet.txt"));
Console.WriteLine(GetFileInfo("timeSheet.txt");
Console.WriteLine(GetCreationTime("timeSheet.txt");
Console.WriteLine(File.FileInfo("timeSheet.txt");
11. A _____ represents a chunk of data and enables the programmer to work with a sequence of bytes.
Directory
File
Stream
TextFile
12. In the following code, the statement "StudentData.Close()" _____.
try
{
StreamWriter StudentData = new StreamWriter("Dossier.txt",true);
for (int i = 0; i < 10; i++)
StudentData.WriteLine("Student[{0}]: ", i);
StudentData.Close();
}
writes 10 lines to "Dossier.txt"
keeps the StreamWriter object "StudentData" open
writes a final new line to "Dossier.txt"
Part 3
1. Show the source code for a C# console application called "Downpayment" to display the 20% down payment one would make on a $250,000 house. (Note that the down payment would be .20 times the value of the house.)
Declare and initialize appropriate variables for down payment and house value.
Include at least three descriptive comments.
State what your program displays when it runs.
State how you would use the debugger to check the values of your variables as your program runs.
2. Describe two types of loops that can be used to print every third integer from 0 to 300 (i.e., 0, 3, 6, 9, etc.), each on its own line. Which would be a better choice and why? Write the code using that type of loop.
3. Briefly describe how parameter passing by-value and by-reference are accomplished in memory. Write statement 1 to call method A below. Write statement 2 to call method B. Which method uses pass by-value? Which method uses pass by-reference?
static void Main()
{
int balance = 15000;
//statement 1
//statement 2
}
//method A
public static void addBonus(ref int balance)
{
balance = balance + 1000;
}
//method B
public static int addBonus(int balance)
{
return (balance + 1000);
}
4. Identify an example of one of each of the following GUI design errors in Figure 2:
inconsistency
misalignment
clutter
How could each of the three errors be corrected to improve the user experience?
Image Description
5. Although the following code compiles and runs, the programmer made some major readability errors. Describe at least three changes that would make it easier for other programmers to read and understand the code.
class Program
{
static void Main() //main
{
int a;
int Float = 10; // ints
for(int i = 0;i < Float;i++) /* loop */{
a=method(i);
Console.WriteLine(a);
}
Console.Read(); //read
}
public static int method(int a) /*method*/ {
return (int)(Math.Pow((double)a,2.0));
}
}
6. Write a C# program to store an array of integers 10 through 19. Use an appropriate loop to multiply all of the values in the list. Print out the result.