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// Use Wait() using System; using SystemThreading; using SystemThreadingTasks; class DemoTask { // A method to be run as a task static void MyTask() { ConsoleWriteLine("MyTask() #" + TaskCurrentId + " starting"); for(int count = 0; count < 10; count++) { ThreadSleep(500); ConsoleWriteLine("In MyTask() #" + TaskCurrentId + ", count is " + count ); } ConsoleWriteLine("MyTask #" + TaskCurrentId + " terminating"); } static void Main() { ConsoleWriteLine("Main thread starting");

Notice that, even though the sine function takes the value 3/2 at many different values of the variable x, the function Sine takes this value only at x = /3 Similar comments apply to the other two examples We also have Cos 1 3 2 5 , 6

Part II:

// Construct two tasks Task tsk = new Task(MyTask); Task tsk2 = new Task(MyTask); // Run the tasks tskStart(); tsk2Start(); ConsoleWriteLine("Task ID for tsk is " + tskId); ConsoleWriteLine("Task ID for tsk2 is " + tsk2Id); // Suspend Main() until both tsk and tsk2 finish tskWait(); tsk2Wait(); ConsoleWriteLine("Main thread ending"); } }

I decided to get rid of the junk and focus on the key points Taking my draft and listing the ideas I wanted to express was great! After I did that, I focused on tightening up modi ers like looking thoroughly That means scrutinizing, so I said scrutinizing Overall, I was pleased with my nal revision It was simpler, more focused on my objective, and much clearer

Here is the output:

= , 2 =

Main thread starting Task ID for tsk is 1 Task ID for tsk2 is 2 MyTask() #1 starting MyTask() #2 starting In MyTask() #1, count In MyTask() #2, count In MyTask() #1, count In MyTask() #2, count In MyTask() #1, count In MyTask() #2, count In MyTask() #1, count In MyTask() #2, count In MyTask() #1, count In MyTask() #2, count In MyTask() #1, count In MyTask() #2, count In MyTask() #1, count In MyTask() #2, count In MyTask() #1, count In MyTask() #2, count In MyTask() #1, count In MyTask() #2, count In MyTask() #1, count MyTask #1 terminating In MyTask() #2, count MyTask #2 terminating Main thread ending

Part I:

ConsoleWriteLine("Area is " + t2Area()); } }

The output of this program is shown here:

4

Info for t1: Triangle is right Width and height are 8 and 12 Color is Blue Area is 48 Info for t2: Triangle is isosceles Width and height are 2 and 2 Color is Red Area is 2

Because of inheritance, ColorTriangle can make use of the previously defined classes of Triangle and TwoDShape, adding only the extra information it needs for its own, specific application This is part of the value of inheritance; it allows the reuse of code This example illustrates one other important point: base always refers to the constructor in the closest base class The base in ColorTriangle calls the constructor in Triangle The base in Triangle calls the constructor in TwoDShape In a class hierarchy, if a base class constructor requires parameters, then all derived classes must pass those parameters up the line This is true whether or not a derived class needs parameters of its own

In the foregoing discussion of inheritance and class hierarchies, an important question may have occurred to you: When a derived class object is created, whose constructor is executed first The one in the derived class or the one defined by the base class For example, given a derived class called B and a base class called A, is A s constructor called before B s, or vice versa The answer is that in a class hierarchy, constructors are called in order of derivation, from base class to derived class Furthermore, this order is the same whether or not base is used If base is not used, then the default (parameterless) constructor of each base class will be executed The following program illustrates the order of constructor execution: