Python Program Collection 04
1. Print numbers from 1 to 10 using a for loop
for i in range(1, 11):
print(i)
2. Print numbers from 1 to 10 using a while loop
i = 1
while i <= 10:
print(i)
i += 1
3. Print the first 10 natural numbers in reverse order
for i in range(10, 0, -1):
print(i)
4. Sum of numbers from 1 to 100
total = 0
for i in range(1, 101):
total += i
print("Sum:", total)
5. Print even numbers between 1 and 20
for i in range(2, 21, 2):
print(i)
6. Find the sum of even numbers between 1 and 50
total = 0
for i in range(2, 51, 2):
total += i
print("Sum of even numbers between 1 and 50:", total)
7. Calculate the sum of all odd numbers from 1 to 100
total = 0
for i in range(1, 101, 2):
total += i
print("Sum of odd numbers between 1 and 100:", total)
8. Sum of the first n natural numbers
n = int(input("Enter a number: "))
total = sum(range(1, n + 1))
print(f"Sum of the first {n} natural numbers is {total}")
9. Find the sum of numbers divisible by 3 and 5 between 1 and 100
total = 0
for i in range(1, 101):
if i % 3 == 0 and i % 5 == 0:
total += i
print("Sum of numbers divisible by 3 and 5 between 1 and 100:", total)
10. Print the first 10 multiples of a given number
num = int(input("Enter a number: "))
for i in range(1, 11):
print(f"{num} x {i} = {num * i}")
11. Print the sum of the first 20 even numbers
total = 0
for i in range(2, 41, 2):
total += i
print("Sum of the first 20 even numbers:", total)
12. Print the multiplication table of a number
num = int(input("Enter a number: "))
for i in range(1, 11):
print(f"{num} x {i} = {num * i}")
13. Factorial of a number using a for loop
num = int(input("Enter a number: "))
factorial = 1
for i in range(1, num + 1):
factorial *= i
print(f"Factorial of {num} is {factorial}")
14. Factorial of a number using a while loop
num = int(input("Enter a number: "))
factorial = 1
i = 1
while i <= num:
factorial *= i
i += 1
print(f"Factorial of {num} is {factorial}")
15. Print the Fibonacci sequence up to a given number
n = int(input("Enter a number: "))
a, b = 0, 1
while a <= n:
print(a, end=" ")
a, b = b, a + b
16. Print the Fibonacci sequence up to n terms using a while loop
n = int(input("Enter the number of terms: "))
a, b = 0, 1
count = 0
while count < n:
print(a, end=" ")
a, b = b, a + b
count += 1
17. Print the sum of the digits of a number
num = int(input("Enter a number: "))
sum = 0
while num > 0:
digit = num % 10
sum += digit #
num = num // 10
print("Sum of the digits:", sum)
18. Check if a number is prime using a while loop
num = int(input("Enter a number: "))
i = 2
is_prime = True
while i <= num // 2:
if num % i == 0:
is_prime = False
break
i += 1
if is_prime:
print(f"{num} is a prime number.")
else:
print(f"{num} is not a prime number.")
19. Print all prime numbers up to 50
for num in range(2, 51):
for i in range(2, num):
if num % i == 0:
break
else:
print(num)
20. Find the GCD of two numbers using a while loop
a = int(input("Enter the first number: "))
b = int(input("Enter the second number: "))
while b:
a, b = b, a % b
print(f"GCD is {a}")
21. Find the LCM of two numbers using a for loop
def gcd(a, b):
while b:
a, b = b, a % b
return a
def lcm(a, b):
return a * b // gcd(a, b)
a = int(input("Enter the first number: "))
b = int(input("Enter the second number: "))
print(f"LCM is {lcm(a, b)}")
22. Count the number of digits in a number
num = int(input("Enter a number: "))
count = 0
while num > 0:
num //= 10
count += 1
print(f"Number of digits:", count)
23. Calculate the power of a number using a for loop
base = int(input("Enter the base: "))
exponent = int(input("Enter the exponent: "))
result = 1
for _ in range(exponent):
result *= base
print(f"{base} to the power of {exponent} is {result}")
24. Reverse a number using a while loop
num = int(input("Enter a number: "))
reversed_num = 0
while num > 0:
digit = num % 10
reversed_num = reversed_num * 10 + digit
num = num // 10
print("Reversed number:", reversed_num)
25. Print the sum of squares of numbers from 1 to 10
total = 0
for i in range(1, 11):
total += i ** 2
print("Sum of squares:", total)
26. Print the cube of numbers from 1 to 5
for i in range(1, 6):
print(f"Cube of {i} is {i ** 3}")
27. Check if a number is a palindrome using a while loop
num = int(input("Enter a number: "))
original_num = num
reversed_num = 0
while num > 0:
digit = num % 10
reversed_num = reversed_num * 10 + digit
num //= 10
if original_num == reversed_num:
print(f"{original_num} is a palindrome.")
else:
print(f"{original_num} is not a palindrome.")
28. Print all Armstrong numbers between 100 and 999
for num in range(100, 1000):
sum_of_cubes = sum(int(digit) ** 3 for digit in str(num))
if sum_of_cubes == num:
print(num)
29. Check if a number is an Armstrong number using a while loop
num = int(input("Enter a number: "))
sum_of_cubes = 0
temp = num
while temp > 0:
digit = temp % 10
sum_of_cubes += digit ** 3
temp //= 10
if num == sum_of_cubes:
print(f"{num} is an Armstrong number.")
else:
print(f"{num} is not an Armstrong number.")
30. Print the factorial of a number using recursion
def factorial(n):
if n == 1:
return 1
else:
return n * factorial(n - 1)
num = int(input("Enter a number: "))
print(f"Factorial of {num} is {factorial(num)}")
31. Print a pyramid pattern of stars
rows = int(input("Enter the number of rows: "))
for i in range(1, rows + 1):
print(' ' * (rows - i) + '*' * (2 * i - 1))
32. Print an inverted pyramid pattern of stars
rows = int(input("Enter the number of rows: "))
for i in range(rows, 0, -1):
print(' ' * (rows - i) + '*' * (2 * i - 1))
33. Find the sum of the digits of an integer using a for loop
num = input("Enter a number: ")
total = 0
for digit in num:
total += int(digit)
print("Sum of digits:", total)
34. Calculate the average of numbers entered by the user
total = 0
count = 0
while True:
num = input("Enter a number (or 'done' to finish): ")
if num.lower() == 'done':
break
total += float(num)
count += 1
print("Average:", total / count)
35. Generate a list of squares of numbers from 1 to n
n = int(input("Enter a number: "))
squares = [i ** 2 for i in range(1, n + 1)]
print("List of squares:", squares)
36. Print all multiples of 4 between 1 and 100
for i in range(4, 101, 4):
print(i)
37. Check if a number is a perfect square using a while loop
import math
num = int(input("Enter a number: "))
sqrt = math.isqrt(num)
if sqrt * sqrt == num:
print(f"{num} is a perfect square.")
else:
print(f"{num} is not a perfect square.")
38. Check if a number is a perfect number
num = int(input("Enter a number: "))
divisors = [i for i in range(1, num) if num % i == 0]
if sum(divisors) == num:
print(f"{num} is a perfect number.")
else:
print(f"{num} is not a perfect number.")
39. Print the factorial of numbers from 1 to n
n = int(input("Enter a number: "))
factorial = 1
for i in range(1, n + 1):
factorial *= i
print(f"Factorial of {i} is {factorial}")
40. Find the largest number in a list using a loop
lst = [int(x) for x in input("Enter numbers separated by spaces: ").split()]
largest = lst[0]
for num in lst:
if num > largest:
largest = num
print("Largest number:", largest)
41. Print all prime factors of a given number
num = int(input("Enter a number: "))
i = 2
while num > 1:
if num % i == 0:
print(i)
num //= i
else:
i += 1
42. Find the smallest number in a list using a loop
lst = [int(x) for x in input("Enter numbers separated by spaces: ").split()]
smallest = lst[0]
for num in lst:
if num < smallest:
smallest = num
print("Smallest number:", smallest)
43. Print the first n odd numbers
n = int(input("Enter the number of odd numbers: "))
count = 0
i = 1
while count < n:
print(i)
i += 2
count += 1
44. Print the first n even numbers
n = int(input("Enter the number of even numbers: "))
count = 0
i = 2
while count < n:
print(i)
i += 2
count += 1
45. Count the number of vowels and consonants in a string
string = input("Enter a string: ").lower()
vowels = 'aeiou'
vowel_count = consonant_count = 0
for char in string:
if char.isalpha():
if char in vowels:
vowel_count += 1
else:
consonant_count += 1
print("Vowels:", vowel_count)
print("Consonants:", consonant_count)
46. Print the reverse of a string using a loop
string = input("Enter a string: ")
reversed_string = ""
for char in string:
reversed_string = char + reversed_string
print("Reversed string:", reversed_string)
47. Count the frequency of each character in a string
string = input("Enter a string: ").lower()
frequency = {}
for char in string:
if char in frequency:
frequency[char] += 1
else:
frequency[char] = 1
print("Character frequency:", frequency)
Print all the factors of a number
num = int(input("Enter a number: "))
for i in range(1, num + 1):
if num % i == 0:
print(i)
48. Calculate the sum of series 1 + 1/2 + 1/3 + ... + 1/n
n = int(input("Enter a number: "))
total = 0
for i in range(1, n + 1):
total += 1 / i
print("Sum of the series:", total)
49. Print the elements of a list in reverse order using a for loop
lst = [int(x) for x in input("Enter numbers separated by spaces: ").split()]
for i in range(len(lst) - 1, -1, -1):
print(lst[i])
50. Count the frequency of elements in a list using a dictionary
lst = [1, 2, 2, 3, 3, 3, 4, 4, 4, 4]
frequency = {}
for item in lst:
if item in frequency:
frequency[item] += 1
else:
frequency[item] = 1
print("Frequency of elements:", frequency)
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