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The if statement enables the conditional execution of code based on the evaluated value of some condition. An if statement in its simplest form is as follows: if ( condition ) { statements; } The condition can be any expression, but to make more sense it should evaluate to a Boolean value of either true or false. It is perfectly valid to evaluate to a zero (false) or nonzero (true) condition, as well. Obviously, it is possible to execute a block of code when a condition is not true, as shown here: if ( ! condition ) { statements; } What if you want a block of code to execute when a condition is true and some other block of code to execute when the condition is false You could write two if statements, one for the true condition and one for the false condition, or you could use the if-else statement, which looks like this: if ( condition ) { statements; } else // ! condition (the comment is optional) { statements; } There is one more construct for if statements. What if you want different blocks of code to be executed based on mutually exclusive conditions You could write a stream of if conditions, one for each condition, but then each condition would have to be checked, which would be a waste of time. Instead, you should use the if-else if-else construct, also called the nested if construct, which exits the if construct once it matches a condition. The nested if construct looks like this:

Dates are, in general, one of the most difficult things to handle in development (right behind strings) Therefore, you will almost always have more rules for date testing than any other type of tests Here are the basic unit testing areas: Boundary values: Test the minimum and maximum values allowed for a given parameter An example here is when dealing with strings What happens if you are passed an empty string Is it valid On the other hand, what if someone passes a string value of 100,000 characters and you try to convert the length of the string to a short Equality: Test a value that you are looking for In the case of the age check example used here, what if the date passed also includes the time An equality check will always fail in that case, but in every other case, the results would come out correctly..

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component needs to be referenced by the CreateObject call. On some installations, this may be WinHttp.WinHttpRequest.5.1. Please see http://msdn.microsoft.com/library/enus/winhttp/http/winhttp_start_page.asp for more information.

if ( condition1 ) // first mutually exclusive condition { statements; } else if ( condition2 ) // second mutually exclusive condition { statements; } else // optional catch the rest condition { statements; } This example will display a different string depending on the value of the animal variable: enum Creature : int {Dog, Cat, Eagle}; Creature animal; // assign a value to animal animal = Cat; if ( animal == Dog ) { Console::WriteLine ("The animal is a dog"); } else if ( animal == Cat ) { Console::WriteLine ("The animal is a cat"); } else // animal is not a dog or cat { Console::WriteLine ("Maybe the animal is a bird"); }

Close all instances of Visual Studio and then reopen Visual Studio. Create any type of project and add a class field without the underscore in front of the name. Run the code analysis on the project. Your Error List window should show the rule violation, as in Figure 13-3.

The switch statement is a multiple-choice flow-control construct. It functions in a very similar manner to the nested if construct, except that it only works for integer value types or expressions that evaluate to integers. The switch statement works like this: The switch expression is checked against each case constant. If a case constant matches the expression, then its associated statements are executed. If no case constant matches the expression, then the default statements are executed. Finally, the switch statement is exited. A switch statement looks like this: switch ( expression ) { case constant1: statements1; break; case constant2: statements2; break; default: statements3; }

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