While...Loop

Note that this form of the Do While structure executes the loop at least once. 

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The command cloop is used to find the closed-loop transfer function. The command max is used to find the maximum value of 20 logio (mag), i.e. Mp and the frequency at which it occurs i.e. tUp = uj k). A while loop is used to find the —3 dB point and hence bandwidth = ca (n). Thus, in addition to plotting the closed-loop frequency response gain diagrams,/ gd29.7 will print in the command window ... 

While loops lack apparent stmcmral regularity, they exist in a specific conformation stabilized through hydrogen bonding, salt bridges, and hydrophobic interactions with other portions of the protein. However, not all portions of proteins are necessarily ordered. Proteins may contain disordered regions, often at the extreme amino or carboxyl terminal, characterized by high conformational flexibility. In many instances, these disor-... 

In a WHILE construction, WHILE Q DO P- ENDWHILE, notice that Q can be assumed true when P is initiated and false when the WHILE loop is ended (if it ever is). Thus if it is true that whenever A and Q hold at the start of P, then A holds at the end of P, then it is also true that whenever A holds at the start of the WHILE loop, then at the end A holds and NOT Q is true. 

The code does not rerun the query for each lookup. It accesses the data only once from the data source and adds the Person object from each row to all lookups in each iteration of the while loop. This approach offers good performance for building the entity dictionary. 

In each iteration in the while loop, the code determines whether a new research site is introduced ... 

The static block is executed when the class is loaded into the JVM. Look at what the static block does. It creates an anonymous inner class of type Thread—the refreshThread. Its run() method puts the thread into sleep for a period of time (30 minutes in our code example). When it wakes up, it calls the refresh() method of the EntityDictionaryManager. The static block starts the refresh thread, which means that the entity dictionary refresh is handled by an independent thread. The thread is in an indefinite while-loop that puts the thread into sleep after every entity dictionary refresh. The thread wakes up every 30 minutes and does the next entity dictionary refresh. 

The Do While...Loop is used when you don t know beforehand how many times the loop will need to be executed. The syntax is shown in Figure 14-13. 

Figure 14-14. Alternate form of Do While...Loop structure.

Often you use a loop structure to search through an array or collection of objects, looking for a certain value or property. Once you find a match, you don t need to cycle through the rest of the loops. You can exit from the loop using the Exit For (from a For...Next loop or For Each...Next loop) or Exit Do (from a Do While... loop). The Exit statement will normally be located within an If statement. For example. 

Peitsch, Guex [151, 196] SwissModel GROMOS Alignment determines core backbone, while loops are built with database method. Side chains are built using the template side chain where possible, and GROMOS minimization otherwise. 

There are three types of Do loops Do..., Do... While, andDo... Until. Of these, the first is somewhat tricky, because it is unconstrained, i.e., it could go on forever, in which case you may have to stop it with Esc or Ctrl + Break. Below we only discuss the constrained Do loops. The Do...While loop has the syntax... 

As a preliminary, the closed-shell scfGR is repeated below with this change implemented The while loop no longer needs the braces since it is only one statement but the braces are retained as the loop is to be extended very soon. 

What is necessary now is simply to insert the code to take care of the four possible spin cases into the while loop... 

As we ve mentioned, the sum of the series will eventually be equal to 1, at which point we jump out of the while loop and print the final result. Is the final result 1 or 0 You seem to have all the necessary information to determine whether the last value of the variable is 1 or 0, even without mnning the program. What is your answer ... 

Figure 17.3. While loops execute the same block repeatedly until a defined condition is satisfied.

Before the loop begins, the program creates a variable named count and sets its value to 1. The while loop test checks whether count is less than or equal to 10 and executes the two statements contained in the only braces as long as this condition holds true. The hrst statement prints out the cmrent value of count, and the second increments the variable by 1. The first time the while statement is encountered, count was set to 1, so the block is executed. The second time, count is 2, and the block is executed again. This continues imtil count is 6, at which point the test is no longer true (because count is greater than 5) and the loop terminates. The output for the program is quite simply... 

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