meet it

A does the same job again and again.

A loop repeats a block of code, so you never copy and paste. A for loop counts for you. for (int i = 1; i <= 3; i++) has three parts, split by semicolons.

Start: make a box i holding 1. Keep going while: run the block as long as i <= 3 is true. Step: after each turn, i++ adds one to i, because means add one.

So the block runs with i as 1, then 2, then 3. When i reaches 4, the condition is false and the loop stops. You can use i inside the block.

using System;

for (int i = 1; i <= 3; i++)
{
    Console.WriteLine($"Hooray number {i}");
}
Console.WriteLine("Party over!");

i is a short name people often give the counting box in a for loop.

guess first

Where does it stop? Guess first.

Guess before you run it. Wrong guesses are how you learn, and nothing is marked.

using System;

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

your turn

Your turn. Run a few laps.

Choose how many laps to run, as a whole number of at least 1, and type it in the blank. Then press run.

Your code

output

press run to see what happens

fix it

The bunny should hop three times. Can you fix it?

Broken code to fix

output

press run to see what happens

Run it. The bunny only hops twice. Look at the keep-going part of line 3.
When hop is 3, is hop < 3 still true?
Change < to <= on line 3, then press run.

nailed it

your code can count now. :D

A loop repeats a block, so you never copy and paste.
A for loop has a start, a keep-going check and a step.
i++ adds one to i after every turn.

new words in your collection

loop
for
++

This lesson isn’t saved. A free account remembers every lesson you finish.

A for loop does the same job again and again.

Where does it stop? Guess first.

Your turn. Run a few laps.

The bunny should hop three times. Can you fix it?

your code can count now. :D

A does the same job again and again.