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While loop → while examples

While loop

while examples

Examples of while loop to understand working concept of while loops in Python

Simple Counter

Simple counter using while loop in python i = 0 while i < 10: print(i) i += 1

Output

0 1 2 3 4 5 6 7 8 9

Sum of Numbers

Sum of numbers inside a range using while loop in python n = 10 sum = 0 i = 1 while i <= n: sum = sum + i i = i+1 print("The sum is", sum)

Output

The sum is 55

Factorial of a Number

Factorial of a number using while in python num = 5 factorial = 1 while num > 1: factorial *= num num -= 1 print("Factorial is ", factorial)

Output

Factorial is 120

Fibonacci Series

Fibonacci series example using while loop in python n = 10 a, b = 0, 1 while a < n: print(a, end=' ') a, b = b, a+b

Output

0 1 1 2 3 5 8

Guessing Game

Number guessing game in python using while loop import random number = random.randint(1, 10) guess = 0 while number != guess: guess = int(input('Guess a number between 1 and 10: ')) print('You guessed right!')

Output

Guess a number between 1 and 10: 6 Guess a number between 1 and 10: 6 Guess a number between 1 and 10: 1 Guess a number between 1 and 10: 2 Guess a number between 1 and 10: 3 Guess a number between 1 and 10: 3 Guess a number between 1 and 10: 4 You guessed right! code executed successfully with code 0

Reverse a Number

Reversing number using while loop in python num = 12345 reverse_num = 0 while num > 0: digit = num % 10 reverse_num = reverse_num * 10 + digit num = num // 10 print("Reversed Number is: ", reverse_num)

Output

Reversed Number is: 54321

Multiplication Table

Multiplication table using while loop in python num = 5 i = 1 while i <= 10: print(num, 'x', i, '=', num*i) i += 1

Output

5 x 1 = 5 5 x 2 = 10 5 x 3 = 15 5 x 4 = 20 5 x 5 = 25 5 x 6 = 30 5 x 7 = 35 5 x 8 = 40 5 x 9 = 45 5 x 10 = 50

Countdown Timer

countdown using while loop in python import time countdown = 5 while countdown > 0: print(countdown) time.sleep(1) countdown -= 1 print("Blast off!")

Output

5 4 3 2 1 Blast off!

Palindrome Check

Palindrome example in python using while loop word = "madam" reversed_word = "" while len(word) > 0: reversed_word += word[-1] word = word[:-1] print("Reversed word is: ", reversed_word)

Output

Reversed word is: madam

Prime Number Check

prime number example using while loop num = 17 i = 2 is_prime = True while i * i <= num: if num % i: i += 1 else: is_prime = False break if is_prime: print(num, "is a prime number.") else: print(num, "is not a prime number.")

Output

17 is a prime number.
These examples should give you a good understanding of how to use while loops in Python

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