49 lines
1.3 KiB
Markdown
49 lines
1.3 KiB
Markdown
# Counter lesson
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Learn how to create a counter with with **on button** pressed.
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## Topic
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Variables
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## Quick Links
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* [activity](/lessons/counter/activity)
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* [challenges](/lessons/counter/challenges)
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* [quiz](/lessons/counter/quiz)
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* [quiz answers](/lessons/counter/quiz-answers)
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## Prior learning and lesson level
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Learn how to create a **variable** to keep track of the current count. We will be learning how to create a counter app using a variable and simple commands, such as on button pressed, and show number.
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## Documentation
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```cards
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input.compassHeading()
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basic.forever(() => {})
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let x = 0
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if (true) {}
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basic.showString("Hello!")
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basic.showLeds(`
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. . . . .
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. . . . .
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. . # . .
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. . . . .
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. . . . .
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`)
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```
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* **[variable](/blocks/variables)**:
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* **[arithmetic operators](/types/number)**
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* **[on button pressed](/reference/input/on-button-pressed)**
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* **[show number](/reference/basic/show-number)**
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## Objectives
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* learn how to create a variable as a place where you can store data so that you can use it later in your code, accessible across all functions, and in nested code blocks
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* learn how arithmetic operators operate on numbers and return a number
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* learn how to run code when an input button is pressed
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* learn how to show a number on the LED screen, one digit at a time (scrolling from left to right)
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