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Updating sequence

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The pattern of counting is simple, so simple in fact that you probably do not think consciously about how you go from one number to the next: You can describe the pattern by saying each successive number is It is important to understand the step-by-step changes during execution.

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Look at the following example program In a file, where the interpreter does not need to respond immediately, the blank line is not necessary.One of the simplest patterns is illustrated in all of the loop examples above, something is printed that is related to each item in the list.Printing is certainly one form of “do something”, but the possibilities for “do something” are completely general!Whenever an object is changed, its USN is incremented.When replication occurs, only the version of the object with the greatest USN is retained.Local counters for USNs are considered reliable because they never decrease or "run backward." USNs are also always unique, making it easier for domain controllers to never use the same USNS at the same time.

One reason why experts prefer USNs over time stamps is because clocks are difficult to keep synchronized and because clocks can't account for any latency between network segments.

We can use a for-each loop to revise our first example.

Each line is doing exactly the same thing, except varying the string used as the cue, while repeating the rest of the line.

In the table below, statements are referred to by the numbers labeling the lines in the code above.

We can track the state of each variable after each line is executed. For instance after line 1 is executed, a value is given to x, but y is still undefined. The comment on the right summarizes what is happening.

For now consider a particularly simple example, just chosen as an illustration, in the example file the result? Particularly if you did not guess right, it is important to understand what happens, one step at a time.