Break and goto

The break statement only works with loops.

Loops for this purpose are : for, foreach, while, do and switch.

It doesn't work with the if statement here as it's not a loop and not embedded within a loop.

Thank you for your explanation.

You developed a program in a website. I have some question about this program. If I use break statement, program is not execuating. Please explain the reason. Problem is highlighted.

using System;

class Program
{
static void Main()
{
Console.Write("Enter number of seats : ");
int numSeats = int.Parse(Console.ReadLine());
Console.Write("Enter number of passengers : ");
int passengers = int.Parse(Console.ReadLine());

if (passengers > numSeats)
{
Console.WriteLine("The number of passengers cannot exceed the number of seats");
return;
}

// create a Random object
Random rand = new Random();

// create an array of seats
int[] seats = new int[numSeats]; // all elements 0 by default

// for each passenger assign a seat at random if it's not already occupied
for (int i = 1; i <= passengers; i++)
{
while (true)
{
int nextSeat = rand.Next(0, numSeats); // excludes end-point

if (seats[nextSeat] == 0) // it's empty
{
seats[nextSeat] = i;
break;
}
}
}

Console.WriteLine("The following seats are occupied by the passengers shown\n");
Console.WriteLine("Seat Passenger");
Console.WriteLine("---- ---------\n");

for (int i = 0; i < numSeats; i++)
{
if (seats[i] > 0) // it's occupied
{
Console.WriteLine("{0, 3} {1, 3}", i + 1, seats[i]);
}
}

Console.WriteLine();

if (numSeats == passengers)
{
Console.WriteLine("There are no empty seats");
break;
}

Console.WriteLine("The following seats are empty\n");
Console.WriteLine("Seat");
Console.WriteLine("----\n");
for (int i = 0; i < numSeats; i++)
{
if (seats[i] == 0) // it's empty
{
Console.WriteLine("{0, 3}", i + 1);
}
}
Console.ReadKey();
}
}

The 'break' keyword in (say) a for loop is equivalent to this:

for(int i = 0; i < 10; i++)
{
    Console.WriteLine(i);
    if (i == 5) goto next;
}
next:

// some more code

So your description of what it does is accurate.

As you say, 'goto' is more flexible but this flexibility can get you into trouble leading to 'spaghetti' code.

For this reason, 'goto' tends to be frowned upon by professional developers though it does have some sensible uses. Check out my article on the subject:

http://www.c-sharpcorner.com/UploadFile/b942f9/acceptable-uses-for-the-goto-statement-in-C-Sharp/