Continue Statement in C#

The continue statement in C# works somewhat like the break statement. Instead of forcing termination, however, continue forces the next iteration of the loop to take place, skipping any code in between.

For the for loop, continue statement causes the conditional test and increment portions of the loop to execute. For the while and do...while loops, continue statement causes the program control passes to the conditional tests.

Syntax:

The syntax for a continue statement in C# is as follows:

continue;

Flow Diagram:

Example:

using System;
 
namespace Continue_Statement
{
  class Program
   {
     static void Main(string[] args)
      {
        int i = 0; 
        while(i<10)
         {
           i++;
           if (i < 6)
            {
              continue;
            }    
           Console.WriteLine(i);
         }           
        Console.Read();
      }
   }
}

When the above code is compiled and executed, it produces the following result:

O/P :6 7 8 9 10
 

Break statement in C#

The break statement in C# has following two usage:

1. When the break statement is encountered inside a loop, the loop is immediately terminated and program control resumes at the next statement following the loop.
2. It can be used to terminate a case in the switch statement.

If you are using nested loops (i.e., one loop inside another loop), the break statement will stop the execution of the innermost loop and start executing the next line of code after the block.

Syntax:

The syntax for a break statement in C# is as follows:

break;

Flow Diagram:

Example:

using System;
 


namespace break_statement

{
 

class Program

{

static void Main(string[] args)
      

{
        

int i = 0;
 
        

while (i < 100)
         

{
           

Console.WriteLine(i);
           

if (i == 20)
            

{
              

Console.WriteLine("breaking the current segment...");
              break;
            

}
           

i++;
         

}  
        

Console.ReadLine();
     

 }
  

 }


}

When the above code is compiled and executed, it produces the following result:

0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
breaking the current segment

Nested Loop in C#

C# allows to use one loop inside another loop. Following section shows few examples to illustrate the concept.

Syntax:

The syntax for a nested for loop statement in C# is as follows:

for ( init; condition; increment )
{
   for ( init; condition; increment )
   {
      statement(s);
   }
   statement(s);
}

The syntax for a nested while loop statement in C# is as follows:

while(condition)
{
   while(condition)
   {
      statement(s);
   }
   statement(s);
}

The syntax for a nested do...while loop statement in C# is as follows:

do
{
   statement(s);
   do
   {
      statement(s);
   }while( condition );

}while( condition );

A final note on loop nesting is that you can put any type of loop inside of any other type of loop. For example a for loop can be inside a while loop or vice versa.

Example:

The following program uses a nested for loop to find the prime numbers from 2 to 100:

using System;

namespace Loops
{
    
   class Program
   {
      static void Main(string[] args)
      {
         /* local variable definition */
         int i, j;

         for (i = 2; i < 100; i++)
         {
            for (j = 2; j <= (i / j); j++)
               if ((i % j) == 0) break; // if factor found, not prime
            if (j > (i / j)) 
               Console.WriteLine("{0} is prime", i);
         }

         Console.ReadLine();
      }
   }
} 

When the above code is compiled and executed, it produces the following result:

2 is prime
3 is prime
5 is prime
7 is prime
11 is prime
13 is prime
17 is prime
19 is prime
23 is prime
29 is prime
31 is prime
37 is prime
41 is prime
43 is prime
47 is prime
53 is prime
59 is prime
61 is prime
67 is prime
71 is prime
73 is prime
79 is prime
83 is prime
89 is prime
97 is prime

Do-While Loop in C#

Unlike for and while loops, which test the loop condition at the top of the loop, the do...while loop checks its condition at the bottom of the loop.

A do...while loop is similar to a while loop, except that a do...while loop is guaranteed to execute at least one time.

Syntax:

The syntax of a do...while loop in C# is:

do
{
   statement(s);

}while( condition );

Notice that the conditional expression appears at the end of the loop, so the statement(s) in the loop execute once before the condition is tested.

If the condition is true, the flow of control jumps back up to do, and the statement(s) in the loop execute again. This process repeats until the given condition becomes false.

Flow Diagram:

Example:

using System;

namespace do_while

{
 

class Program
  

{
     

static void Main(string[] args)
      

{
 

 int table,i,res;
       

 table=12;
       

 i=1;
       

 do
         

{
          

 res = table * i;
         

 Console.WriteLine("{0} x {1} = {2}", table, i, res);
          

 i++;
         

}
 // must put semi-colon(;) at the end of while               condition in do...while loop.
       

 while (i <= 10);
 
       

 Console.ReadLine();
      

}
  

 }

}

When the above code is compiled and executed, it produces the following result:

12 x 1 = 12
12 x 2 = 24
12 x 3 = 36
12 x 4 = 48
12 x 5 = 60
12 x 6 = 72
12 x 7 = 84
12 x 8 = 92
12 x 9 = 108
12 x 10 = 120