break (C# Reference)

 

Updated: July 20, 2015

The break statement terminates the closest enclosing loop or switch statement in which it appears. Control is passed to the statement that follows the terminated statement, if any.

In this example, the conditional statement contains a counter that is supposed to count from 1 to 100; however, the break statement terminates the loop after 4 counts.

    class BreakTest
    {
        static void Main()
        {
            for (int i = 1; i <= 100; i++)
            {
                if (i == 5)
                {
                    break;
                }
                Console.WriteLine(i);
            }

            // Keep the console open in debug mode.
            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
        }
    }
    /* 
     Output:
        1
        2
        3
        4  
    */

In this example, the break statement is used to break out of an inner nested loop, and return control to the outer loop.

    class BreakInNestedLoops
    {
        static void Main(string[] args)
        {

            int[] numbers = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
            char[] letters = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j' };

            // Outer loop
            for (int x = 0; x < numbers.Length; x++)
            {
                Console.WriteLine("num = {0}", numbers[x]);

                // Inner loop
                for (int y = 0; y < letters.Length; y++)
                {
                    if (y == x)
                    {
                        // Return control to outer loop
                        break;
                    }
                    Console.Write(" {0} ", letters[y]);
                }
                Console.WriteLine();
            }

            // Keep the console open in debug mode.
            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
        }
    }

    /*
     * Output:
        num = 0

        num = 1
         a
        num = 2
         a  b
        num = 3
         a  b  c
        num = 4
         a  b  c  d
        num = 5
         a  b  c  d  e
        num = 6
         a  b  c  d  e  f
        num = 7
         a  b  c  d  e  f  g
        num = 8
         a  b  c  d  e  f  g  h
        num = 9
         a  b  c  d  e  f  g  h  i
     */

This example demonstrates the use of break in a switch statement.

    class Switch
    {
        static void Main()
        {
            Console.Write("Enter your selection (1, 2, or 3): ");
            string s = Console.ReadLine();
            int n = Int32.Parse(s);

            switch (n)
            {
                case 1:
                    Console.WriteLine("Current value is {0}", 1);
                    break;
                case 2:
                    Console.WriteLine("Current value is {0}", 2);
                    break;
                case 3:
                    Console.WriteLine("Current value is {0}", 3);
                    break;
                default:
                    Console.WriteLine("Sorry, invalid selection.");
                    break;
            }

            // Keep the console open in debug mode.
            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
        }
    }
    /*
    Sample Input: 1
     
    Sample Output:
    Enter your selection (1, 2, or 3): 1
    Current value is 1
    */

If you entered 4, the output would be:

Enter your selection (1, 2, or 3): 4  
Sorry, invalid selection.  

For more information, see the C# Language Specification. The language specification is the definitive source for C# syntax and usage.

C# Reference
C# Programming Guide
C# Keywords
switch
Jump Statements
Iteration Statements

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