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Mastering C# for .NET Developers

Loops

Explore how to use C# loops such as for, foreach, while, and do...while to repeat code execution while managing conditions. Understand loop control statements break and continue to influence loop behavior and improve program flow.

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Loops are constructions that allow us to execute a block of code multiple times until a certain condition is met. We have several types of loops in C#:

  • The for loop

  • The foreach loop

  • The while loop

  • The do...while loop

The for loop

The syntax of the for loop consists of an initialization, a condition, and an iterator.

for (int i = 0; i < 10; i++)
{
    // Body of the loop
}
General syntax of a for loop

  • for: The keyword that starts the loop.

  • int i = 0: The initialization statement. It runs once before the loop begins. Here, we create an integer counter i and set it to 0.

  • i < 10: The condition. The loop executes as long as this evaluates to true.

  • i++: The iterator. This executes after every iteration, increasing i by 1.

Though we usually prefer integers, the counter does not have to be of the int type; it can be any numeric type.

Flowchart of a for loop
Flowchart of a for loop

To sum up, the loop declaration above consists of three statements. Before the first iteration of our for loop, we declare and initialize a counter variable, i. Its value is 0 in the beginning. The loop runs as long as i < 10.

Because i increments by one after each iteration, the loop runs exactly 10 times.

We can check this by ...