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Exam 8: Advanced Method Concepts

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Question 1

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Methods are ____ when there is the potential for a situation in which the compiler cannot determine which method to use.

A) overloaded
B) ambiguous
C) polymorphic
D) hidden

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Question 2

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Unnamed method arguments are also known as ____ arguments.

A) self-documenting
B) optional
C) default
D) positional

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Question 3

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Match each item with a statement below:

When you use a(n) ____ parameter in a method header, you indicate the parameter's type and name, and the method receives a copy of the value passed to it.

____ parameters act as aliases, or pseudonyms, for the same memory location occupied by the original variable being passed to a method.

A method can return at most one value to a method that calls it.

Given the following program, write the InputMethod() method. It should read two values from the user and assign them to the int variables first and second , which are then printed out in the code shown below. using static System.Console; class InputMethodDemo { static void Main() { int first, second; InputMethod( out first, out second);       WriteLine("After InputMethod first is {0}"), first);       WriteLine("and second is {0}"), second); } }

A method's name and parameter list constitute the method's ____.

In C#, parameters can be mandatory or ____.

In C#, all data types are ____________________.

On occasion, you might want a method to be able to alter a value you pass to it. In that case, you can use a(n) ____ parameter or an output parameter.

When you use the Visual Studio ____________________ to create programs, the IntelliSense feature will allow you to discover built-in overloaded methods by displaying all versions of the method when you type in the method name and the parameter list opening parenthesis.

What is programming principle is violated when using named arguments and why is this important?

You cannot use the out or ref keywords when passing an array to a method.

To avoid data conversion exceptions that occur when a value cannot be converted to an appropriate type, you can use a version of the C# ____ method with an out parameter.

Any optional parameters in a parameter list must appear to the right of all ____ parameters in the list.

Methods with identical names that have identical parameter lists but different return types are ____ methods.

When you use a reference parameter, any passed variable must have an assigned value.

Only ____ parameters can be given default values.

Given the following code, describe a situation that would make the code ambiguous to the C# compiler: using static System.Console; public class AmbiguousMethods { static void Main() { int iNum = 20; double dNum = 4.5; SimpleMethod(iNum, dNum); // calls first version SimpleMethod(dNum, iNum); // calls second version SimpleMethod(iNum, iNum); // error! Call is ambiguous. } private static void SimpleMethod( int i, double d) {       WriteLine("Method receives int and double"); } private static void SimpleMethod( double d, int i) {       WriteLine("Method receives double and int "); } }