🐍Python Program #23: Print All Prime Numbers in an Interval | Python Programming
🐍Python Program #23: Print All Prime Numbers in an Interval | Python Programming
🔢 Want to print all prime numbers between two numbers? This beginner-friendly Python program shows how to check for primes and list them in any interval.
🎯 You’ll Learn:
What prime numbers are
How to use nested loops in Python
Optimization with square root method
A must-know program for coding interviews and practice!
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#computerprogramming
Logic:
1. A prime number is a number greater than 1 that has no divisors other than 1 and itself.
Examples: 2, 3, 5, 7, 11…
2. Ask the user to enter two numbers (start and end of the interval).
→ Example: start = 10, end = 30
3. Loop through all numbers in that range.
4. For each number, check if it is prime:
→ Skip numbers (less than sign)= 1
→ Run a loop from 2 to till num-1 (simple).
→ If divisible by any number → not prime.
→ Else → it’s prime.
5. Print all prime numbers in that interval.
Code:
Print all prime numbers in an interval
start = 10
end = 30
print(f"Prime numbers between {start} and {end} are:")
for num in range(start, end + 1):
if num (greater then) 1:
is_prime = True
for i in range(2, num - 1): # check up to sqrt(num)
if num % i == 0:
is_prime = False
break
if is_prime:
print(num, end=" ")
👉 Perfect for Python beginners and school/college projects!
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