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where sentinel can be one of:

121

126

The rules concerning fixed form source lines apply Spaces within the constructs are optional, and continuation is indicated by a character in column six For example, the following three OpenMP directives are equivalent:

The last piece of data we need is a list of all the lists of digits:

Digits = [Zero, One, Two, Three, Four, Five, Six, Seven, Eight, Nine]

ALTER TABLE dbotbl_order ADD CONSTRAINT [DF_ordernumber] DEFAULT dboudf_new_orderid() FOR ordernumber

We could have created the Digits lists directly, and avoided creating the extra variables For example:

C$oMP PARALLEL DO PRIVATE(I,J)

Digits = [ [" *** ", " * * ", "* *", "* *", "* *", " * * ", " *** "], # Zero [" * ", "** ", " * ", " * ", " * ", " * ", "***"], # One # [" ****", "* *", "* *", " ****", " *", " *", " *"] # Nine ]

We preferred to use a separate variable for each number both for ease of understanding and because it looks neater using the variables We will quote the rest of the code in one go so that you can try to gure out how it works before reading the explanation that follows

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Default constraints are useful as long as you document them for the developers who will be writing the T-SQL code Their functionality can be replaced within stored procedure code, so many people ask why we should bother with default constraints The answer, which is the answer we give for any question involving the use of data integrity, is that you can t always rely on your stored procedures What if you develop a SQL Server Integration Services (SSIS) package that writes data in bulk to a table There will be no stored procedure there to protect you Similarly, what if a developer gets access to the tables and writes code to insert data directly This is a bad practice (we look at avoiding it in 11), but it can still

*!OHP PARALLEL *!OMP1 DOPRIVATE(I,J)

try: digits = sysargv[1] row = 0 while row < 7: line = "" column = 0 while column < len(digits): number = int(digits[column]) digit = Digits[number] line += digit[row] + " " column += 1 print(line) row += 1 except IndexError: print("usage: bigdigitspy <number>") except ValueError as err: print(err, "in", digits)

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The whole code is wrapped in an exception handler that can catch the two things that can go wrong We begin by retrieving the program s command-line argument The sysargv list is 0-based like all Python lists; the item at index position 0 is the name the program was invoked as, so in a running program this list always starts out with at least one item If no argument was given we will be trying to access the second item in a one-item list and this will cause an IndexError exception to be raised If this occurs, the ow of control is immediately switched to the corresponding exception-handling block, and there we simply print the program s usage Execution then continues after the end of the try block; but there is no more code, so the program simply terminates If no IndexError occurs, the digits string holds the command-line argument, which we hope is a sequence of digit characters (Remember from Piece #2 that identi ers are case-sensitive, so digits and Digits are different) Each big digit is represented by seven strings, and to output the number correctly we must output the top row of every digit, then the next row, and so on, until all seven rows have been output We use a while loop to iterate over each row We could just as easily have done this instead: for row in (0, 1, 2, 3, 4, 5, 6): and later on we will see a much better way using the built-in range() function We use the line string to hold the row strings from all the digits involved Then we loop by column, that is, by each successive character in the command-line argument We retrieve each character with digits[column] and convert the digit to an integer called number If the conversion fails a ValueError exception is raised and the ow of control immediately switches to the corresponding exception handler In this case we print an error message, and control resumes after the try block As noted earlier, since there is no more code at this point, the program will simply terminate.

C!OMP PARALLEL DO PRIVATE(I,J)

range()

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