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Iteration (Looping) Statements |
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The do...while Loop
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There are times when a while loop might not serve your purpose. In certain situations, you might want to reverse the semantics from Run while this is true to the subtly different Do this, and repeat while this condition remains true. In other words, take the action, and then, after the action is completed, check the condition. Such a loop will always run at least once. To ensure that the action is taken before the condition is tested, use a do...while loop:
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do statement while (boolean-expression);
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The syntax is to write the keyword do, followed by your statement (or block), the while keyword, and the condition to test in parentheses. The statement must end with a semicolon, unlike the plain while loop. Example 5-13 rewrites Example 5-12 to use a do...while loop.
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using using using using System; System.Collections.Generic; System.Linq; System.Text;
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namespace Example_5_13_ _ _ _The_do._._.while_Loop { class Program { public static void Main( ) { int counterVariable = 11; // display the message and then test that the value is // less than 10 do { Console.WriteLine("counterVariable: {0}", counterVariable); counterVariable++; } while (counterVariable < 10); } } }
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counterVariable: 11
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In Example 5-13, counterVariable is initialized to 11 and the while test fails, but only after the body of the loop has run once.
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5: Branching
The for Loop
A careful examination of the while loop in Example 5-12 reveals a pattern often seen in iterative statements: initialize a variable (counterVariable=0), test the variable (counterVariable<10), execute a series of statements, and increment the variable (counterVariable++). The for loop allows you to combine all these steps in a single statement. You write a for loop with the keyword for, followed by the for header, inside the parentheses, using the syntax:
for ([initializers]; [expression]; [iterators]) statement
The first part of the header is the initializer, in which you initialize a variable. The second part is the Boolean expression to test. The third part is the iterator, in which you update the value of the counter variable. These three parts correspond to the three parts of the while loop we mentioned earlier. All of this is enclosed in parentheses. A simple for loop is shown in Example 5-14.
using using using using System; System.Collections.Generic; System.Linq; System.Text;
namespace Example_5_14_ _ _ _The_for_Loop { class Program { public static void Main( ) { for (int counter = 0; counter < 10; counter++) { Console.WriteLine("counter: {0} ", counter); } } } }
The output looks like this:
counter: counter: counter: counter: counter: counter: counter: counter: counter: counter: 0 1 2 3 4 5 6 7 8 9
Iteration (Looping) Statements |
The counter variable is initialized to zero in the initializer:
for (int counter=0; counter<10; counter++)
The value of counter is tested in the expression part of the header:
for (int counter=0; counter<10; counter++)
Finally, the value of counter is incremented in the iterator part of the header:
for (int counter=0; counter<10; counter++)
The initialization part runs only once, when the for loop begins. The integer value counter is created and initialized to zero, and the test is then executed. Because counter is less than 10, the body of the for loop runs and the value is displayed. After the loop completes, the iterator part of the header runs and counter is incremented. The value of the counter is tested, and, if the test evaluates true, the body of the for statement is executed again.
Your iterator doesn t just have to be ++. You can use --, or any other expression that changes the value of the counter variable, as the needs of your program dictate. Also, for the purposes of a for loop, counter++ and ++counter will have the same result.
The logic of the for loop is as though you said, For every value of counter, which I initialize to zero, take this action if the test returns true, and after the action, update the value of counter.
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