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Rubella-specific IgM or monthly rising IgG levels What is the difference between rubella IgM and IgG Both increase after exposure; however, IgM disappears after 1 2 months and so can distinguish acute infection from prior immunization. IgG is present for life Most are asymptomatic, but many women present with a rash Sensorineural deafness (50 75%) Cataracts (20 50%) Cardiac malformations (PDA [20 50%] or pulmonary arterial hypoplasia [20 50%]) Neurologic sequelae (meningoencephalitis, behavior disorders, or MR [10 20%]) Growth retardation Hepatosplenomegaly Thrombocytopenia Dermatologic manifestations (purpura, known as blueberry muffin lesions) Hyperbilirubinemia How is congenital rubella prevented Through vaccination strategies and by testing all pregnant women for immunity No it is a live, attenuated virus Supportively there is no known treatment for rubella

As the preceding example demonstrated, passing an object reference to a method is a straightforward task. However, there are some nuances that the example did not show. In certain cases, the effects of passing a reference type will be different than those experienced when passing a value type. To see why, let s review the two ways in which an argument can be passed to a subroutine. The first way is call-by-value. This method copies the value of an argument into the formal parameter of the subroutine. Therefore, changes made to the parameter of the subroutine have no effect on the argument used in the call. The second way an argument can be passed is call-by-reference. In this method, a reference to an argument (not the value of the argument) is passed to the parameter. Inside the subroutine, this reference is used to access the actual argument specified in the call. This means that changes made to the parameter will affect the argument used to call the subroutine. By default, C# uses call-by-value, which means that a copy of the argument is made and given to the receiving parameter. Thus, when you pass a value type, such as int or double, what occurs to the parameter that receives the argument has no effect outside the method. For example, consider the following program:

Part II:

Original contents of vals: 1 2 3 4 5 6 7 8 9 Negated contents of vals: -1 -2 -3 -4 -5 -6 -7 -8 -9

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IP: Because string is a container, it also supports the common container functions, such as begin( ), end( ), and size( ).

"What number do you get when you take lim 1+- " and "What value of a in the function y = a x gives a derivative equal to itself " produce the number e. Most of the exponential problems in the remainder of this chapter will use the number e. As we get further into the study of logarithms, e will return again as an important number. The derivative of the basic exponential function e x is e * ,or

The key point is that the type of the item selected by select must agree with the type argument passed to IEnumerable<T> used to declare the query variable. Often, query variables use var rather than explicitly specifying the type because this lets the compiler infer the proper type from the select clause. As you will see, this approach is particularly useful when select returns something other than an element from the data source. When a query is executed by the foreach loop, the type of the iteration variable must be the same as the type of the range variable. In the preceding examples, this type was explicitly specified as int, but you can let the compiler infer the type by specifying this variable as var. As you will see, there are also some cases in which var must be used because the type name of the data is unknown.