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Notice the positions of the three commas in the sentence: 1 after the introductory prepositional phrase (In her opening remarks) 2 between the attribution of the quote and the quote (Ms Kingsley said) 3 after the opening dependent clause within the quote (As I said a year ago) Once you understand where commas need to go and why, putting them there is fairly straightforward Separate Modifying Phrases Modifying phrases add information, often providing valuable or interesting details that clarify or expand ideas Setting off these phrases

case 4: ConsoleWriteLine("i is four"); break; default: ConsoleWriteLine("i is five or more"); break; } } }

= 8 ( y 2) 2 ( y 4) 4

The output produced by this program is shown here:

i i i i i i i i i i is is is is is is is is is is zero one two three four five or five or five or five or five or

As you can see, each time through the loop, the statements associated with the case constant that matches i are executed All others are bypassed When i is five or greater, no case constants match, so the default is executed In the preceding example, the switch was controlled by an int variable As explained, you can control a switch with any integer type, including char Here is an example that uses a char expression and char case constants:

= 256

// Use a char to control the switch using System; class SwitchDemo2 { static void Main() { char ch; for(ch='A'; ch<= 'E'; ch++) switch(ch) { case 'A': ConsoleWriteLine("ch break; case 'B': ConsoleWriteLine("ch break; case 'C': ConsoleWriteLine("ch break; case 'D': ConsoleWriteLine("ch break; case 'E': ConsoleWriteLine("ch

is A");

is B");

is C");

YOU TRY IT Calculate the volume enclosed when the curve y = cos x is rotated about the line y = 4, x 3

with punctuation helps the reader understand the relationship between the modi cation and the main thought Whenever you punctuate a modifying phrase, there are always three options, and the marks are properly used in pairs 1 Use commas to convey neutrality 2 Use parentheses to indicate that the modifying phrase is an aside 3 Use dashes to highlight an abrupt change or to add emphasis Consider how the meaning of the sentence below changes when it s punctuated these three different ways:

is D");

is E");

5:

One of the basic principles of physics is that work performed is force times distance: If you apply force F pounds in moving an object d feet, then the work is W = F d foot-pounds The problem becomes more interesting (than simple arithmetic) if the force is varying from point to point We now consider some problems of that type

break; } }

The output from this program is shown here:

Notice that this example does not include a default case Remember, the default is optional When not needed, it can be left out In C#, it is an error for the statement sequence associated with one case to continue on into the next case This is called the no fall-through rule This is why case sequences end with a break statement (You can avoid fall-through in other ways, such as by using the goto discussed later in this chapter, but break is by far the most commonly used approach) When encountered within the statement sequence of a case, the break statement causes program flow to exit from the entire switch statement and resume at the next statement outside the switch The default sequence also must not fall through, and it too usually ends with break The no fall-through rule is one point on which C# differs from C, C++, and Java In those languages, one case may continue on (that is, fall through) into the next case There are two reasons that C# instituted the no fall-through rule for cases: First, it allows the compiler to freely rearrange the order of the case sequences, perhaps for purposes of optimization Such a rearrangement would not be possible if one case could flow into the next Second, requiring each case to explicitly end prevents a programmer from accidentally allowing one case to flow into the next Although you cannot allow one case sequence to fall through into another, you can have two or more case labels refer to the same code sequence, as shown in this example: