meet it

An `if` runs code only when its is `true`.

Picture a fork in the path with a sign asking a question. An if asks a condition like that, inside round brackets. If the answer is yes, C# runs the lines inside. If not, it walks straight past.

Every condition is true or false. A value that can only be one of these is a , and it can live in a box too. To ask whether two values match, use two equals signs, ==.

The lines that belong to the if sit in a , between curly brackets that each get a line of their own. Indent the lines inside by four spaces, so your eyes can see the block too.

using System;

int goals = 3;
Console.WriteLine(goals == 3);
if (goals == 3)
{
    Console.WriteLine("Hat-trick! Take a bow.");
}
Console.WriteLine("Full time.");

On the screen, C# shows a bool with a capital letter, as True or False.

guess first

Rain or shine? Guess what this shows.

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

using System;

bool raining = false;
if (raining)
{
    Console.WriteLine("Take a coat.");
}
Console.WriteLine("Off you go!");

your turn

Your turn. Get past the robot door.

The robot only opens for its owner. Type your name in both boxes, spelled exactly the same, then press run.

Your code

output

press run to see what happens

fix it

The quiz will not run. Can you fix it?

Broken code to fix

output

press run to see what happens

C# stopped at the if line. Look at the sign between answer and 12.
One = puts a value in a box. To ask whether two values match, you need two.
Change = to == on line 4, then press run.

nailed it

your code can make choices now. :D

if runs its block only when the condition is true.
Use == to ask whether two values match.
The block sits between curly brackets, indented.

new words in your collection

condition
bool
block

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

An if runs code only when its condition is true.

Rain or shine? Guess what this shows.

Your turn. Get past the robot door.

The quiz will not run. Can you fix it?

your code can make choices now. :D

An `if` runs code only when its is `true`.