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Iteration (Looping) Statements |
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The signals are simulated by entering numerals and uppercase characters from the keyboard, using the Console.ReadLine( ) method, which reads a line of text from the keyboard. ReadLine( ) reads a line of text into a string variable. The program ends when you press the A key. The algorithm is simple: receipt of a 0 (zero) means normal conditions, and no further action is required except to log the event. (In this case, the program simply writes a message to the console; a real application might enter a timestamped record in a database.) On receipt of an Abort signal (simulated with an uppercase A), the problem is logged and the process is ended. Finally, for any other event, an alarm is raised, perhaps notifying the police. (Note that this sample does not actually notify the police, though it does print out a harrowing message to the console.) If the signal is X, the alarm is raised but the while loop is also terminated. Here s one sample output:
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Enter a signal. X = stop. A = Abort: 0 Received: 0 All is well. Enter a signal. X = stop. A = Abort: 1 Received: 1 1 -- raise alarm! Enter a signal. X = stop. A = Abort: X Received: X X -- raise alarm!
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Here s a second sample output:
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Enter a signal. X = stop. A = Abort: A Received: A Fault! Abort
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The point of this exercise is that when the A signal is received, the action in the if statement is taken and then the program breaks out of the loop, without raising the alarm. When the signal is 0, it is also undesirable to raise the alarm, so the program continues from the top of the loop.
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Be sure to use uppercase when entering X or A. To keep the code simple, there is no code to check for lowercase letters or other inappropriate input.
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Optional for loop header elements
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You will remember that the for loop header has three parts initialization, expression, and iteration and the syntax is as follows:
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for ([initializers]; [expression]; [iterators]) statement
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5: Branching
Each part of the for loop header is optional. You can, for example, initialize the value outside the for loop, as shown in Example 5-18.
using using using using System; System.Collections.Generic; System.Linq; System.Text;
namespace Example_5_18_ _ _ _for_Loop_Without_Initialization { class Program { public static void Main( ) { int counter = 0; // some work here counter = 3; // more work here for (; counter < 10; counter++) { Console.WriteLine("counter: {0} ", counter); } } } }
The output looks like this:
counter: counter: counter: counter: counter: counter: counter: 3 4 5 6 7 8 9
In this example, the counter variable was initialized and modified before the for loop began. Notice that a semicolon is used to hold the place of the missing initialization statement. You can also leave out the iteration step if you have reason to increment the counter variable inside the loop, as shown in Example 5-19. Skipping the increment step undermines the purpose of using a for loop, and isn t recommended. If you do happen to use it, you must be certain that the counter will increment every time through the loop, no matter what the rest of the code in the loop does. If you somehow skip the increment step, your loop may never end.
Iteration (Looping) Statements |
using using using using System; System.Collections.Generic; System.Linq; System.Text;
namespace Example_5_19_ _ _ _for_Loop_Without_Iterator { class Program { public static void Main( ) { for (int counter = 0; counter < 10; ) // no increment { Console.WriteLine("counter: {0} ", counter); // do more work here counter++; // increment counter } } } }
You can mix and match which statements you leave out of a for loop.
If you create a for loop with no initializer or incrementer, like this:
for ( ; counter < 10 ; )
you have a while loop in for loop s clothing; and of course that construct is silly, and thus not used very often.
It is even possible to leave all the statements out, creating what is known as a forever loop:
for ( ;; )
You can also create a forever loop with a while(true) loop:
while ( true )
You break out of a forever (or while(true)) loop with a break statement. A forever loop is shown in Example 5-20.
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