Python Program Collection 04

 

 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)