Iteration Statements In C#

 

 In C#, iteration statements are used to repeat a block of code several times or until a specific condition is met. The process of repeating a task repeatedly is called looping or iteration. There are four types of iteration statements in C#: For, Foreach, Do, and While

C# for statement

The for statement in C# is used to execute a block of code a specific number of times. It consists of three parts: the initialization statement, the condition expression, and the iterator statement.

The general syntax of a for the statement in C# is.

Açıklamak
for (initialization statement; condition expression; iterator statement)
{
    // code to be executed
}

The initialization statement is executed once before the loop starts and is used to declare and initialize any variables used in the loop.

The condition expression is evaluated before each iteration of the loop. If the condition is true, the code inside the loop is executed. If the condition is false, the loop terminates.

The iterator statement is executed after each iteration of the loop and is used to modify any variables used in the condition expression.

C# for statement example

Here is an example of a for statement that loops through a block of code five times, and each time, it prints a string "The iteration number is" with the count value to the console. In this code, int i=1; is a declaration of a local variable that will participate throughout the loop.The i<=5; is the condition that decides how often iteration will continue.

Açıklamak
public class Program {
    public static void Main() {
        for (int i = 1; i <= 7; i++) {
            Console.WriteLine("The iteration number is " + i);
        }

        Console.ReadLine();
    }
}

C#

Output. The output of the above program looks like this

The iteration number is 1

The iteration number is 2

The iteration number is 3

The iteration number is 4

The iteration number is 5

The iteration number is 6

The iteration number is 7

C# foreach statement

The foreach statement in C# is used to iterate over a collection of objects. It provides a simpler and more readable way to loop through the elements of a collection than using a for or while loop.

The general syntax of a foreach statement in C# is.

Açıklamak
foreach (type variable in collection)
{
    // code to be executed
}

C#

In this syntax, type is the type of the elements in the collection, the variable is a variable that refers to each element in turn, and collection is the collection of objects being iterated over.

C# foreach statement example

Here's an example of a foreach statement in C# that iterates over an array of strings and prints each element of the array. The string array daysofWeek has five elements.

Açıklamak


using System;
public class Program {
    public static void Main() {
        string[] firstSixMonthsOfYear= new string[] {
            "January",
                "February",
                "March",
                "May",
                "June",
                "July",
        };
        foreach(string Month in firstSixMonthsOfYear) {
            Console.WriteLine("The Month is : {0}", Month);
        }


        Console.ReadLine();
    }
}

C#

Output. The output of the above program looks like this.

The Month is : January

The Month is : February

The Month is : March

The Month is : May

The Month is : June

The Month is : July

The foreach statement is recommended on a collection of objects.

C# while statement

The while statement in C# is used to execute a block of code as long as a specific condition is true. It evaluates the condition before each iteration of the loop.

The general syntax of a while statement in C# is:

Açıklamak
while (condition)
{
    // code to be executed
}

C#

In this syntax, the condition is the expression evaluated before each iteration of the loop. If the condition is true, the code inside the loop is executed. If the condition is false, the loop terminates, and the program continues with the next statement after the loop.

The following flowchart diagram represents a while loop.

C# while statement example

In the following program, a while statement loop runs until the value of num is less or equal to 7

Açıklamak
public class Program {
    public static void Main() {
        int num = 1;
        while (num <= 7) {
            Console.WriteLine("The number is {0}", num);
            num++;
        }
        Console.ReadLine();
    }
}

C#

Output​​​​​​. The output of the above program looks like this

The number is 1

The number is 2

The number is 3

The number is 4

The number is 5

The number is 6

The number is 7

C# do-while statement

The do-while statement in C# is used to execute a block of code at least once and as long as a specific condition is true. It evaluates the condition after each iteration of the loop.

The general syntax of a do-while statement in C# is:

Açıklamak
do
{
    // code to be executed
} while (condition);

C#

In this syntax, the block of code inside the do statement is executed at least once, regardless of the value of the condition. After the block of code is executed, the while statement checks if the condition is true. If the condition is true, the loop repeats, and the block of code is executed again. If the condition is false, the loop terminates, and the program continues with the next statement after the loop.

C# do-while statement example

The following example executes the block of code with the do scope until the value ofnum is less than or equal to 6.

Açıklamak
public class Program {
    public static void Main() {
        int num = 1;
        do {
            Console.WriteLine("The number is {0}", num);
            num++;
        } while (num <= 6);

        Console.ReadLine();
    }
}

C#

Output. The output of the above program looks like this:

The number is 1

The number is 2

The number is 3

The number is 4

The number is 5

The number is 6

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