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Our robot's health is always between [code]0[/code] and [code]100[/code].

But as our robot fights, we want to increase its strength and toughness.

When a character levels up, it might deal more damage to enemies, gain new abilities or, in our case, gain more health.
We define a [code]level[/code] variable to keep track of the level of the robot. It starts at level one.

When the robot has defeated enough enemies, we call the [code]level_up()[/code] function to increment the robot's level.
As we briefly saw in the last lesson, our robot could have a range of variables that could increase when it levels up.
In this lesson, we'll just focus on increasing the robot's [code]max_health[/code].

The variable [code]max_health[/code] is the maximum amount the robot's [code]health[/code] can be. We change our [code]heal()[/code] function to use this variable.
We could add [code]5[/code] to the [code]max_health[/code] every time the robot levels up.
This would increase [code]max_health[/code] the same amount every time.

If we graphed [code]max_health[/code], it'd look something like this.
This growth is [b]linear[/b].

In our case, we want a feeling of more and more power as the robot levels up.

We want a graph like this.
This growth is [b]exponential[/b].

With each level, more [code]max_health[/code] is added than the previous level up.

To get the exponential growth, we multiply the [code]max_health[/code] by an amount greater than [code]1[/code] each time the robot levels up.

To multiply values together, we use [code]*[/code].
What is the value of damage?
[code]
var level = 5
var power = 3

func calculate_damage():
var damage = power * level
[/code]
We multiply [code]power[/code] by [code]level[/code] using [code]*[/code] to get the result of [code]15[/code].

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  1. Learn GDScript From Zero
  2. lesson-14-multiplying
  3. English
This would increase [code]max_health[/code] the same amount every time.

If we graphed [code]max_health[/code], it'd look something like this.
This would increase [code]max_health[/code] the same amount every time.

If we graphed [code]max_health[/code], it'd look something like this.
2 years ago
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read-only
Source string location
course/lesson-14-multiplying/lesson.tres:112
String age
2 years ago
Last updated
a year ago
Source string age
2 years ago
Translation file
lesson-14-multiplying.pot, string 6