• For Loop
• Foreach Loop
• While Loop

• Do -while Loop

1. For Loop

The for loop is used when the number of iterations is known beforehand. It consists of three parts: initialization, condition, and iteration.

Syntax:

csharp
1for (initialization; condition; iteration)
2{
3    // Code to execute
4}

Example:

csharp
1for (int i = 0; i < 5; i++)
2{
3    Console.WriteLine("Iteration: " + i);
4}

Output:

1Iteration: 0
2Iteration: 1
3Iteration: 2
4Iteration: 3
5Iteration: 4

2. Foreach Loop

The foreach loop is specifically designed for iterating over collections, such as arrays, lists, or any object that implements the IEnumerable interface. It simplifies the syntax and reduces the risk of errors.

Syntax:

csharp
1foreach (var item in collection)
2{
3    // Code to execute
4}

Example:

csharp
1string[] fruits = { "Apple", "Banana", "Cherry" };
2
3foreach (var fruit in fruits)
4{
5    Console.WriteLine(fruit);
6}

Output:

1Apple
2Banana
3Cherry

3. While Loop

The while loop continues to execute as long as the specified condition is true. The condition is checked before the loop's body is executed.

Syntax:

csharp
1while (condition)
2{
3    // Code to execute
4}

Example:

csharp
1int count = 0;
2
3while (count < 5)
4{
5    Console.WriteLine("Count: " + count);
6    count++;
7}

Output:

1Count: 0
2Count: 1
3Count: 2
4Count: 3
5Count: 4

4. Do-While Loop

The do-while loop is similar to the while loop, but it guarantees that the loop's body will be executed at least once, as the condition is checked after the execution of the loop body.

Syntax:

csharp
1do
2{
3    // Code to execute
4} while (condition);

Example:

csharp
1int count = 0;
2
3do
4{
5    Console.WriteLine("Count: " + count);
6    count++;
7} while (count < 5);

Output:

1Count: 0
2Count: 1
3Count: 2
4Count: 3
5Count: 4

5. Breaking and Continuing Loops

• Break Statement: The break statement is used to exit a loop prematurely. It can be used in any loop.

Example:

csharp
1for (int i = 0; i < 10; i++)
2{
3    if (i == 5)
4    {
5        break; // Exit the loop when i is 5
6    }
7    Console.WriteLine(i);
8}

Output:

10
21
32
43
54

• Continue Statement: The continue statement skips the current iteration and moves to the next iteration of the loop.

Example:

csharp
1for (int i = 0; i < 10; i++)
2{
3    if (i % 2 == 0)
4    {
5        continue; // Skip even numbers
6    }
7    Console.WriteLine(i);
8}

Output:

11
23
35
47
59

Summary

• For Loop: Ideal when the number of iterations is known.
• Foreach Loop: Simplifies iteration over collections.
• While Loop: Executes as long as a condition is true, with the condition checked before the loop body.
• Do-While Loop: Executes at least once, with the condition checked after the loop body.
• Break Statement: Exits the loop immediately.
• Continue Statement: Skips the current iteration and proceeds to the next.