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3 Use Riemann sums to calculate each of the following integrals: 2 (a) 1 x 2 x dx (b)

// Demonstrate pointers and unsafe using System; class UnsafeCode { // Mark Main as unsafe unsafe static void Main() { int count = 99; int* p; // create an int pointer p = &count; // put address of count into p ConsoleWriteLine("Initial value of count is " + *p); *p = 10; // assign 10 to count via p ConsoleWriteLine("New value of count is " + *p); } }

If you add attachments to supplement the body of your work, be certain to include a table of contents so readers can nd those sections of interest to them and skip the rest Even if all the attachments are skipped, simply including them adds weight literally and guratively to your communications Attaching documents to E-mails, on the other hand, needs to be carefully considered Many companies have security programs that flag E-mails with attachments Worries about viruses and policies prohibiting the circulation of jokes and cartoons have resulted in many organizations stopping E-mails with attachments from reaching the intended party without rst going to a security administrator Make sure your readers know the attachment is relevant and expected EXERCISE 10: Write a First Draft You re now ready to write a rst draft In Two, you created an outline or a Hub & Spokes model for a reference letter for a colleague Review your outline or model to remind yourself of the points you want to make What is your most compelling bene t Where do you want to start What s your objective While there are countless ways to write a letter of reference, effective ones share some qualities: a sincere tone, relevant information, and an offer to follow up Get your thoughts in order, answer the questions below, and get ready to write! Don t worry if you go blank Simply draw a circle around the word or phrase you re struggling with (or on a computer, type xx) In the revision process we ll come back and gure out what to do with your circles (and we ll search for your xx s) Don t worry about grammar, spelling, or sentence length that is, don t worry about the details Focus on your subject matter, and then write 1 How will you refer to your reader By rst name By last name What salutation is appropriate 2 Write a lead How do you want to begin your letter Can you incorporate the Rule of First Reference 3 How do you want to end What s your conclusion 4 Will you end with Sincerely Regards Do you intend to sign your full name.

The output of this program is shown here:

The fixed modifier is often used when working with pointers It prevents a managed variable from being moved by the garbage collector This is needed when a pointer refers to a field in a class object, for example Because the pointer has no knowledge of the actions of the garbage collector, if the object is moved, the pointer will point to the wrong object Here is the general form of fixed: xed (type* p = & xedObj) { // use xed object } Here, p is a pointer that is being assigned the address of an object The object will remain at its current memory location until the block of code has executed You can also use a single statement for the target of a fixed statement The fixed keyword can be used only in an unsafe context You can declare more than one fixed pointer at a time using a commaseparated list Here is an example of fixed:

// Demonstrate fixed using System; class Test { public int num; public Test(int i) { num = i; } }

1 x 2 1 2

20:

U n s a f e C o d e , P o i n t e r s , N u l l a b l e Ty p e s , D y n a m i c Ty p e s , a n d M i s c e l l a n e o u s To p i c s