C# for Loop

for (int i = 1; i <= 5; i++)
  {
    Console.WriteLine(i);
   }

Syntax of using for loop

This is how you may use the for loop in C#:

The parts of the for loop in the above syntax are explained below:

An example of for loop with increment operator

In this example, we will display the value of variable x in each iteration of the loop.

In the initialize section, the variable x is declared with an initial value of 10.

The second part, condition, is set as the value of variable 100 or less.

The third part (iterator) is set to increase the value of x by 10.

Have a look at the code and output:

using System;

class for_loop_demo
{
    static void Main()
    {
        for (int x = 10; x <= 100; x = x + 10)
        {
            Console.WriteLine("value of X = " +x);
        }
        Console.ReadLine();
    }
}

Output:

The example with the decrement operator

The example below uses decrement in the iterator section. So, this time variable x value is set as 50 and in each iteration, its will be subtracted by 5. The value of x is displayed in each iteration to show the current value:

using System;
class for_loop_demo_decrement
{
    static void Main()
    {
        for (int x = 50; x >= 0; x = x - 5)
        {
            Console.WriteLine("value of X = " +x);
        }
        Console.ReadLine();
    }
}

Using break statement in for loop example

The break statement can be used in the for loop for exiting the loop entirely. As soon as the break statement is executed, the for loop quits and the control moves to the next line outside of the loop.

In the following example, we have an array of numbers.

In the for loop, I used a for loop to iterate through a C# array. In the condition section, the length method of the array is used.

Inside the loop body, the if condition is used to check the current element value.

If this is equal to 10 then the break statement will execute to exit the loop:

using System;

class for_loop_demo_break

{
    static void Main()
    {
        int[] arr_nums = { 2, 4, 6, 8, 10, 12, 14, 17, 20, 22 };

        for (int x = 0; x < arr_nums.Length; x++)
        {
            Console.WriteLine(arr_nums[x]);

            if (arr_nums[x] == 10)
            {
                Console.WriteLine("The value of current array element is 10, so it will quit!");
                break;
            }
        }
        Console.ReadLine();
    }
}

The result:

Get the leap years by using continue in for loop

As said earlier, for exiting the current iteration only, you may use the continue statement in C#. To demonstrate that, we have an array of years.

By using the for loop with the continue and if statements, we will get the leap years and display it on the screen.

The array contains the following years:

See the code and how the continue statement is used:

using System;
class for_loop_demo_leap
{
    static void Main()
    {
        int[] arr_years = { 1992, 1994, 1996, 2000, 2002, 2008, 2010, 2012, 2016, 2018 };

        Console.WriteLine("Following are the leap years in the Array:\n");

        for (int l = 0; l < arr_years.Length; l++)
        {
            if (arr_years[l] % 4 == 0)
            {
                Console.WriteLine(arr_years[l]);
                continue;
            }
        }
        Console.ReadLine();
    }
}

The leap years list:

You can see that other years are filtered as those encountered the continue statement in the for loop.