Bilangan Prima dengan Scratch

Introduction

In this tutorial, we will learn how to identify prime numbers using Scratch, a visual programming language that is great for beginners. Understanding prime numbers is fundamental in mathematics, and creating a Scratch program to find them is a fun way to enhance your coding skills while exploring number theory.

Step 1: Setting Up Scratch

1. Open Scratch on your computer or go to the Scratch website.
2. Create a new project by clicking on "Create".
3. Familiarize yourself with the Scratch interface, including the stage, sprite area, and blocks palette.

Step 2: Creating the Prime Number Checker

1. Add a Variable:

   • Go to the Variables section and click on "Make a Variable".
   • Name it "number" to store the number you want to check.

2. Input the Number:

   • Use the "ask" block to prompt the user to enter a number.
   • Connect it to the "set number to answer" block so that the input is stored in your variable.

3. Initialize a Counter:

   • Create another variable called "counter" to keep track of how many divisors the number has.
   • Set "counter" to 0 at the start of your script.

Step 3: Checking for Divisors

1. Create a Loop:

   • Use a "repeat" block and set it to repeat for every number from 1 to the value of "number".

2. Check for Divisibility:

   • Inside the loop, use an "if" block.
   • Check if "number mod i = 0" (where "i" is the loop counter). If true, increase the "counter" by 1.

3. Determine Prime Status:

   • After the loop, use another "if" block to check if "counter = 2".
   • If true, display a message stating that the number is prime. Otherwise, state that it is not prime.

Step 4: Testing the Program

1. Click the green flag to run your program.
2. Input various numbers to test whether your program accurately identifies prime numbers.
3. Note any errors or discrepancies in the results and adjust your logic as needed.

Conclusion

You have now created a Scratch program to check for prime numbers! This project not only helps you understand the concept of prime numbers but also strengthens your Scratch programming skills. Next, consider expanding your project by allowing the user to check a range of numbers or adding visual elements to enhance user interaction. Happy coding!