C# 0 The Complete Reference

PART I

C h a p t e r   5 :  

P r o g r a m   C o n t r o l   S t a t e m e n t s  

103

PART IPART I

This program generates the following output:

-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 Done

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;

      Console.Write(i + " ");

      i++;

    } while(i <= 10);

    Console.WriteLine("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

      }

    }

    Console.WriteLine("Smallest factor is " + factor);

  }

}

The output is shown here:

Smallest factor is 2

www.freepdf-books.com

---

104

 

P a r t   I :  

T h e   C #   L a n g u a g e

The