winforms qr code

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Variance is the square of the standard deviation (described in the previous note). For example, given the three sets {0,0,21,21}, {0,7,14,21}, and {9,10,11,12}, each has an average of 10.5. Their variances are 110.25, 61.25, and 1.25, respectively. The third set has a much smaller variance than the other two because its values are all close to 10.5.

To see that the test also fails, change the Add() method as follows: public static int Add(int number1, int number2) { return number1 * number2; } Now rerun the program, and you ll see the failure message.

These tables have a One-to-Many relationship, enforced through a FOREIGN KEY constraint on their OrderID fields. One-to-Many is the usual relationship implemented between an Orders table and an OrderDetail table. The OrderDetail table contains many records that belong to one order. You might want to revisit 5, where the table relationships are explained in more detail. You ll create these tables in the following exercise. This time we don t explain each step in great detail, as you ve been through these processes before in this book. Feel free to refer to previous chapters if anything is unclear.

1. First add the Orders table to the database with the columns described in Table 14-1.

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So far in this chapter, we ve dealt with three pieces of code: The code segment that implements the Add() method is a component that performs the calculation operation. The code that represents a caller, which could be either the Windows application or the console application, is considered production code. The code that contains the production code with some verification routines represents testing code. The testing code is important because, if the component implementation is altered, you need to rerun only the testing code to make sure everything works as it should. These three pieces of code have demonstrated a complete development cycle.

OrderID DateCreated DateShipped Verified Completed Canceled Comments CustomerName CustomerEmail ShippingAddress

The code and projects have been organized, but we re missing some tests. The current test adds two simple numbers. Another test could be to add two really big numbers, such as 2 billion and 2 billion. The code to test the addition of two really big numbers is shown in Figure 2-11. Add this to Program.cs in the TestCalculator project.

VARP: Similar to VARP, estimates variance, but based on the entire population given as arguments. For example, =VARP(20,40,95,60,100) returns 956. VARP assumes that the list is the entire list of values. If this list is not the entire list of values but just a portion, use VAR instead.

int smalldatetime smalldatetime bit bit bit nvarchar(1000) nvarchar(50) nvarchar(50) nvarchar(500)

Figure 2-11. Testing the addition of two large numbers The test to add two very large numbers is identical to the test to add two simple numbers, except for the numbers themselves. The error message is handled a bit differently than in the previous code, in that it is built using concatenation techniques. In the example, a string is concatenated with an integer with a string. C# will automatically convert the integer into a string. Often, you will write tests where the only real difference is the data itself, not the ramifications of the data. Do you thinking of adding two very large numbers (such as 2 billion plus 2 billion) and two smaller numbers (such as 2 plus 2) as different No, because to humans, the major difference between 2 billion and 2 is a bunch of zeros; the result is either 4 billion or 4, which seems very trivial. Yet with respect to a computer, 4 billion is very different from 4, as you ll soon see. Before you run the test, you need to add a call to it in the Main() method: static void Main(string[] args) { TestSimpleAddition(); TestReallyBigNumbers(); } Now run the very large number test. You will see the following output: Error found(-294967296) should have been (4869586958695) The generated output indicates that an error occurred and that adding 2 billion to 2 billion results in a value of -294967296, which makes no sense whatsoever. What happened The problem has to do with the type of number (int) used to declare the Add() method.

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