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The foreach Loop
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The foreach loop cycles through the elements of a collection A collection is a group of objects C# defines several types of collections, of which one is an array The foreach loop is examined in 7, when arrays are discussed
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Using break to Exit a Loop
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It is possible to force an immediate exit from a loop, bypassing any code remaining in the body of the loop and the loop s conditional test, by using the break statement When a break statement is encountered inside a loop, the loop is terminated, and program control resumes at the next statement following the loop Here is a simple example:
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// Using break to exit a loop using System; class BreakDemo { static void Main() { // Use break to exit this loop for(int i=-10; i <= 10; i++) { if(i > 0) break; // terminate loop when i is positive ConsoleWrite(i + " "); } ConsoleWriteLine("Done"); } }
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5:
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Program Control Statements
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This program generates the following output:
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-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 Done
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PART I PART I PART I
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As you can see, although the for loop is designed to run from 10 to 10, the break statement causes it to terminate early, when i becomes positive The break statement can be used with any of C# s loops For example, here is the previous program recoded to use a do-while loop:
// Using break to exit a do-while loop using System; class BreakDemo2 { static void Main() { int i; i = -10; do { if(i > 0) break; ConsoleWrite(i + " "); i++; } while(i <= 10); ConsoleWriteLine("Done"); } }
Here is a more practical example of break This program finds the smallest factor of a number
// Find the smallest factor of a value using System; class FindSmallestFactor { static void Main() { int factor = 1; int num = 1000; for(int i=2; i <= num/i; i++) { if((num%i) == 0) { factor = i; break; // stop loop when factor is found } } ConsoleWriteLine("Smallest factor is " + factor); } }
The output is shown here:
Smallest factor is 2
Part I:
The C# Language
The break stops the for loop as soon as a factor is found The use of break in this situation prevents the loop from trying any other values once a factor has been found, thus preventing inefficiency When used inside a set of nested loops, the break statement will break out of only the innermost loop For example:
// Using break with nested loops using System; class BreakNested { static void Main() { for(int i=0; i<3; i++) { ConsoleWriteLine("Outer loop count: " + i); ConsoleWrite(" Inner loop count: "); int t = 0; while(t < 100) { if(t == 10) break; // terminate loop if t is 10 ConsoleWrite(t + " "); t++; } ConsoleWriteLine(); } ConsoleWriteLine("Loops complete"); } }
This program generates the following output:
Outer loop count: 0 Inner loop count: 0 1 2 3 4 5 6 7 8 9 Outer loop count: 1 Inner loop count: 0 1 2 3 4 5 6 7 8 9 Outer loop count: 2 Inner loop count: 0 1 2 3 4 5 6 7 8 9 Loops complete
As you can see, the break statement in the inner loop causes only the termination of that loop The outer loop is unaffected Here are two other points to remember about break: First, more than one break statement may appear in a loop However, be careful Too many break statements have the tendency to destructure your code Second, the break that exits a switch statement affects only that switch statement and not any enclosing loops
Using continue
It is possible to force an early iteration of a loop, bypassing the loop s normal control structure This is accomplished using continue The continue statement forces the next iteration of the loop to take place, skipping any code in between Thus, continue is essentially the complement of break For example, the following program uses continue to help print the even numbers between 0 and 100
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