🐍Python Program #20: Find the GCD of Two Numbers | Python Programming
🐍Python Program #20: Find the GCD of Two Numbers | Python Programming
🔍 Learn how to calculate the GCD (Greatest Common Divisor) of two numbers in Python using a simple for loop!
In this beginner Python tutorial, you'll understand:
✅ What GCD means
✅ How to use loops and conditions
✅ Real-world use of modulus operator
This is a common interview question and a basic building block for future math-related programs!
📌 Don’t forget to try it with your own numbers and share your results 💬
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Logic:
1. GCD (Greatest Common Divisor) means the highest number that divides both numbers without a remainder.
2. Ask the user to input two positive integers.
→ Example: num1 = 12, num2 = 18
3. Use a loop to find the smallest of both numbers, because GCD can't be more than that.
4. Run a loop from 1 to that smaller number.
5. For every number in that range, check:
→ If num1 % i == 0 and num2 % i == 0 → it’s a common divisor
6. Keep updating the gcd variable whenever a new common divisor is found.
7. After loop ends, print the final value of gcd.
Code:
num1 = 12
num2 = 18
for i in range(1, min(num1, num2) + 1):
if (num1 % i == 0) and (num2 % i == 0):
gcd = i
print(f"The GCD of {num1} and {num2} is: {gcd}")
👉 Perfect for Python beginners and school/college projects!
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