Page 94 - Computing book 6

Minecraft Class 6

If statements:

Now we're going to learn about if statements. If statements are a fundamental part of learning to
program. They help a computer make decisions.

All computers use if statements, including my phone. For example, when I unlock my phone, it runs
some code that says if I enter the password correctly, then unlock the phone. Otherwise, it shows an
error message.

You can use if statements in your code to make Steve and Alice react to what they see in the world.
For example, if there is a rock in front of them, they can turn left. Or turn right if they run into a tree.
In this case, we don't want to fall into the lava. It's easy to plan for the lava. We can see it on the
screen. But what about the lava that we can't under the stone?

After we mine the stone, we'll need to check if there's any lava in that place before moving forward.
If there is lava there, we want to place a stone in front of our character before we can move
forward. That way we can safely move on. Time for more mining! And remember to use the if
statement to watch your step.

The City School /Academics/Computing Curriculum/Class 6/2020-2021 Page 93 of 94