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NOTE In Figure 9-1, we are receiving a warning message about the debugger not being able to load symbols this is simply because we are not using the debug version of the CLR You can ignore this message for now You can now query for information, step through the code, set a breakpoint, print variables, and so on Type a question mark ( ) at the <cordbg> prompt to see a list of commands (Figure 9-2) Since we are interested in seeing exactly where our program crashed, we now step into the code by typing i at the <cordbg> prompt this will open the Application Exception window When you close the window, you will see that the exception generated is the SystemIndexOutOfRangeException exception (see Figure 9-3) By employing this debugging technique, we are able to identify the exception to the exact line Now we can go back into the debugger and ask it some questions about what was happening just prior to the exception For example, you can inquire as to the value of the visible variables by typing p at the <cordbg> prompt This will list the current variables along with their values As we delve deeper into this exception, it becomes apparent that the problem was caused by accessing the args array As a matter of fact, it looks like we ve forgotten to include the command-line parameters when we executed the program After correcting this problem and rerunning the program, we now receive a new exception:

Unhandled Exception : SystemIndexOutOfRangeException: Index was outside the bounds of the array at MyArrayBuildMatrix(Int32 columns, Int32 rows) in <path>\BuggyAppcs:line 53 at BuggyAppMain(String[] args) in <path>\BuggyAppcs:line 13

Proper notes are the first step in forming a permanent record of events as they occurred A True B False

public static void Main()

int[] intArray = new int[5];

for (int i=0; i<intArrayLength; i++)

An officer must be able to go back to their notes and be able to determine the best possible suspect A True B False

Viruses are speci c to the type of host cell that they infect In order for a virus to infect a cell, that cell must have a receptor for the virus If the receptor is absent, the cell cannot be infected by the virus While it seems odd that cells would evolve receptors for viruses, it is usually a case of mistaken identity The viruses can actually mimic another substance for which the cell has a legitimate need and thus has a receptor for The process of viral infection is seen in Figure 85 Once a virus binds to a receptor on the membrane of the host cell, the viral genetic material enters the host either by injecting itself across the cell membrane or by being taken in via endocytosis At some point, the viral genes will be transcribed and translated by the host cell The nucleic acid of the virus will also be replicated Eventually new viruses will be produced and released from the host cell Because each virus contains a copy of the original genetic material, they should all be genetically identical Mutations are the primary way to induce variation into the viral population

intArray[i] = i;

ConsoleWriteLine("The Array contains:");

for (int i=0; i<intArrayLength; i++)

21 The smaller the object, the farther away the observer will be able to recognize it A True B False

ConsoleWriteLine("intArray[{0}] = {1}", i, intArray[i]);

Try to think of an array in C# as an object that contains a column of data Each row in that column can contain a reference variable that points to another array This is what gives the array the multidimensional effect C# supports both rectangular and jaggededged multidimensional arrays In a rectangular multidimensional array each element refers to another array, and each referred-to array is the same length Jagged arrays, on the other hand, contain an array of one-dimensional arrays, each of which can be a different size The following code shows how to declare and use a rectangular array The statements between the brace brackets will be executed five times j will start with the value 0 and be incremented (j++) each time through the loop until it reaches 6 This results in five iterations through the loop

for (int j=0; j<6; j++)

Under normal conditions of visibility, a person with distinctive features can be recognized by friends and relatives at: A 75 yards B 50 yards C 100 yards D 125 yards

for (int k=0; k<6; k++)

int[,] arryTwo = new int[,] {

Which substance may kill your sense of smell temporarily A Gunpowder B Wood smoke C Ether D Electric smoke

{1,2}, // the first row {4,5}, // the second row {6,7} // the third and last row };

In order to restrict user access to data and methods in classes that we create, we can set access modifiers on the member declarations These modifiers create an accessibility domain, which describes the boundaries where access to a member is permitted Accessibility of members (variables, methods, classes, and so on) can be controlled by the way the member is declared When declaring the accessibility of a member, the following keywords are used to control access: