Previously, we saw how to print multiple things on one line using placeholders, like:

println!("My favorite number is {}", 7)

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What was the exact output of that command?

Sometimes, we want to save a piece of information to use later in our program. Think of it like putting something in a labeled box so you can find it easily when you need it.

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Does that idea make sense?

In programming, these labeled boxes are called variables. We create a variable and give it a value using the let keyword and the equals sign (=).

For example: let message = "Hello again!";

Here, message is the variable name (the label on the box).

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What value did we store inside the message variable?

Once you've stored something in a variable, you can use the variable's name wherever you would have used the value itself.

For instance:

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What do you think running these two lines would output?