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Rules of taking this test
Honor Pledge: I pledge that I have neither given nor
received unauthorized help in taking this exam. Dr. Wild Signature: __________________________________________________________ Printed Name: __________________________________________________________
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. Net contains a garbage collection system
a) Suppose you are running a small .NET program on a computer with a lot of
memory so that there is no garbage collection performed while the program is
running. Are there any circumstances where such a program could get into
trouble? justify your answer (5)
b) The imageview
(fig 4.11) program contains the following code
Bitmap bitmap = new Bitmap (FileName);
if (MyBitmap != null)
MyBitmap.Dispose (); // Important!
MyBitmap = bitmap;
//// Would the program still work if you replaced this code with the following statement? explain any differences in behavior if any (5 points)
MyBitmap = new Bitmap (FileName);
CIL Given the following program in CIL (Common Intermediate
Language),
a) generate a plausible c# program that might have generated this
program (this process is called "reverse engineering") Your
solution should be able to be compiled. (8)
b) What observations can you make about the architecture of CIL? (2)
.method private hidebysig static void Main() cil managed
{
.entrypoint
// Code size 28 (0x1c)
.maxstack 4
.locals init ([0] int32 x,
[1] int32 a,
[2] int32 e,
[3] int32 b,
[4] int32 z,
[5] int32 d)
IL_0000: ldc.i4.3
IL_0001: stloc.1
IL_0002: ldc.i4.5
IL_0003: stloc.2
IL_0004: ldc.i4.s 71
IL_0006: stloc.3
IL_0007: ldc.i4.2
IL_0008: stloc.s z
IL_000a: ldc.i4.6
IL_000b: stloc.s d
IL_000d: ldloc.1
IL_000e: ldloc.2
IL_000f: mul
IL_0010: ldloc.3
IL_0011: ldloc.s d
IL_0013: ldloc.s z
IL_0015: mul
IL_0016: ldc.i4.3
IL_0017: div
IL_0018: add
IL_0019: mul
IL_001a: stloc.0
IL_001b: ret
} // end of method class1::Main
Consider the following code
using System;
struct Point {
public int X;
public int Y;
public Point (int x, int y){
this.X = x;
this.Y = y;
}
}
class Rectangle {
public Point CornerTopLeft = new Point();
public Point CornerBottomRight = new Point();
public Rectangle () {}
}
class Class1 {
static void Main(string[] args) {
Point p1 = new Point(4,3);
Point p2;
p2 = p1;
p1.X = 56; p1.Y = 85;
Rectangle r1 = new Rectangle();
Rectangle r2;
r1.CornerTopLeft = p1;
r1.CornerBottomRight = p2;
r2 = r1;
r2.CornerTopLeft = new Point(1,0);
Console.WriteLine("({0},{1})",p2.X,p2.Y);
Console.WriteLine("({0},{1})",p1.X,p1.Y);
Console.WriteLine("({0},{1}) and ({2},{3})",
r1.CornerTopLeft.X,r1.CornerTopLeft.Y, r1.CornerBottomRight.X,r1.CornerBottomRight.Y);
Console.WriteLine("({0},{1}) and ({2},{3})",
r2.CornerTopLeft.X,r2.CornerTopLeft.Y,r2.CornerBottomRight.X,r2.CornerBottomRight.Y);
}
}
a) what will this program print? (5)
b) explain why the program behaves this way (5)
Consider figure 4.11 (the imageview
program)
a) There are three calls to "invalidate" in this program. Describe
the changes in behavior if they are removed (describe each effect separately)
(3)
b) Is there a way to see the image even though these "invalidate"
statements are removed? Explain (3)
c) Change this program to remove the OnPaint function and instead write code
to draw the image in place of the removed "Invalidate" statements.
(4)
Suppose you have a plain text file containing
"key=value" pairs one per line (e.g. Telephone=(757)683-4679).
Write a program which will extract all the key/value pairs putting them into
a Hashtable using a regular expression to extract the information from each
line of the text file. Then print all values whose key is "Telephone".
Also use a regular expression to verify that the value has the proper format
(that is area code in parentheses, a single
dash ('-') before the last four digits. there can be any number of spaces
after the right parenthesis - for example (757) 683-4679
is valid, (757) 6834679 and (757) callodu are not valid). If the value does
not have the proper format, print the
message "does not have the correct format" after the value. (10)
-------
Clarification: a Hash Table only allows one entry for a given key. I will
accept any reasonable solution that using a regular expression to verify the
format of the phone number value. You can verify before or after the hash
table entry. Your solution should not crash if there is a multiple entry.
MyComicsDataList.aspx (figure 6.7), contains the following statement
<asp:LinkButton CommandName="Select" RunAt="server"
CommandArgument='<%# DataBinder.Eval
(Container.DataItem, "Comment") %>'
Text='<%# DataBinder.Eval (Container.DataItem,
"Title") + " " +
DataBinder.Eval (Container.DataItem,
"Number") %>' />
a) what would the effect be of changing this statement to (5 points)
<asp:LinkButton RunAt="server"
CommandArgument='<%# DataBinder.Eval
(Container.DataItem, "Comment") %>'
Text='<%# DataBinder.Eval (Container.DataItem,
"Title") + " " +
DataBinder.Eval (Container.DataItem,
"Number") %>' />
b) what would be effect of changing this statement to(5 points)
<asp:LinkButton CommandName="Select" RunAt="server"
Text='<%# DataBinder.Eval (Container.DataItem,
"Title") + " " +
DataBinder.Eval (Container.DataItem,
"Number") %>' />
Change the data source for MyComicsRepeater.aspx to use an XML file instead of the SQL data base. Show the code changes and show one entry in the XML file (10)
In testlist2.cs change the "Enumerator" class so that the states are enumerated in reverse (alphabetic) order (but don't change the values of the "states" array (10)
In convert2.aspx,
a) what would be effect(s) if you changed the following two statements
Currencies.DataTextField = "Currency";
Currencies.DataValueField = "Exchange";
//// to (5 points)
Currencies.DataTextField =
"Exchange";
Currencies.DataValueField = "Currency";