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// Demonstrate method overloading using System; class Overload { public void OvlDemo() { ConsoleWriteLine("No parameters"); } // Overload OvlDemo for one integer parameter public void OvlDemo(int a) { ConsoleWriteLine("One parameter: " + a); } // Overload OvlDemo for two integer parameters public int OvlDemo(int a, int b) { ConsoleWriteLine("Two parameters: " + a + " " + b); return a + b; } // Overload OvlDemo for two double parameters public double OvlDemo(double a, double b) { ConsoleWriteLine("Two double parameters: " + a + " "+ b); return a + b; } } class OverloadDemo { static void Main() { Overload ob = new Overload(); int resI; double resD; // Call all versions of OvlDemo() obOvlDemo(); ConsoleWriteLine(); obOvlDemo(2); ConsoleWriteLine(); resI = obOvlDemo(4, 6); ConsoleWriteLine("Result of obOvlDemo(4, 6): " + resI); ConsoleWriteLine(); resD = obOvlDemo(11, 232); ConsoleWriteLine("Result of obOvlDemo(11, 232): " + resD); } }

Part I:

This program generates the following output:

60 The area under the curve f (x) = x 3/2 , above the x-axis, and over the interval [2, ), is equal to (a) 4 (b) 1/2 (c) 2 (d) 2 (e)

No parameters One parameter: 2 Two parameters: 4 6 Result of obOvlDemo(4, 6): 10 Two double parameters: 11 232 Result of obOvlDemo(11, 232): 342

b replace commas after the states with semicolons c use dashes after the cities d either b or c 9 The company had _____ most pro table year ever a it s b its c their 10 The committee chair asked the members to meticulously review the proposal a correct as is b to review meticulously c meticulously to review d to review the proposal meticulously Were you able to answer the questions Compare your answers to the following 1 Did you add the title, Implications of Computerizing Customer Service, to the article manuscript The correct answer is b Because of is not a key word, it is not capitalized The title is in quotation marks because it s an article title (Set book titles in italics) 2 Every one of the associates needs training to keep current with technology The correct answer is b Every is singular and thus requires the singular form of the verb need to maintain subject/verb agreement 3 Head north because the winter special is only available in the Northeast starting in January The correct answer is c Northeast is capitalized because it s a geographic region, not a direction 4 The administrator knew it was a problem, so he told his boss right away

As you can see, OvlDemo( ) is overloaded four times The first version takes no parameters; the second takes one integer parameter; the third takes two integer parameters; and the fourth takes two double parameters Notice that the first two versions of OvlDemo( ) return void and the second two return a value This is perfectly valid, but as explained, overloading is not affected one way or the other by the return type of a method Thus, attempting to use these two versions of OvlDemo( ) will cause an error:

// One OvlDemo(int) is OK public void OvlDemo(int a) { ConsoleWriteLine("One parameter: " + a); } /* Error! Two OvlDemo(int)s are not OK even though return types differ */ public int OvlDemo(int a) { ConsoleWriteLine("One parameter: " + a); return a * a; }

2 100x 3 x 10 y ( 10)4

As the comments suggest, the difference in their return types is an insufficient difference for the purposes of overloading As you will recall from 3, C# provides certain implicit (ie, automatic) type conversions These conversions also apply to parameters of overloaded methods For example, consider the following:

// Implicit type conversions can affect overloaded method resolution using System; class Overload2 { public void MyMeth(int x) { ConsoleWriteLine("Inside MyMeth(int): " + x); } public void MyMeth(double x) { ConsoleWriteLine("Inside MyMeth(double): " + x); } } class TypeConv { static void Main() {

8:

Overload2 ob = new Overload2(); int i = 10; double d = 101; byte b = 99; short s = 10; float f = 115F;

61 Simplify the expression log10 (a) (b) (c) (d) (e) x + x log10 2 3y 6 2x x log10 3 y 2 x log10 2 3y + 5 x 3 log10 y + log10 x x log10 y

obMyMeth(i); // calls obMyMeth(int) obMyMeth(d); // calls obMyMeth(double) obMyMeth(b); // calls obMyMeth(int) -- type conversion obMyMeth(s); // calls obMyMeth(int) -- type conversion obMyMeth(f); // calls obMyMeth(double) -- type conversion } }

The output from the program is shown here: