1. Check if a number is even or odd
num = int(input("Enter a number: "))
if num % 2 == 0:
print("Even number")
else:
print("Odd number")
2. Find the largest among three numbers
a = int(input("Enter first number: "))
b = int(input("Enter second number: "))
c = int(input("Enter third number: "))
if a >= b and a >= c:
largest = a
elif b >= a and b >= c:
largest = b
else:
largest = c
print("The largest number is", largest)
3. Check if a string is a palindrome
s = input("Enter a string: ")
if s == s[::-1]:
print("Palindrome")
else:
print("Not a palindrome")
4. Print Fibonacci series up to N terms
n = int(input("Enter number of terms: "))
a, b = 0, 1
for i in range(n):
print(a, end=" ")
a, b = b, a + b
5. Factorial of a number (using loop)
num = int(input("Enter a number: "))
fact = 1
for i in range(1, num + 1):
fact *= i
print("Factorial is", fact)
6. Check if a number is prime
num = int(input("Enter a number: "))
if num < 2:
print("Not Prime")
else:
for i in range(2, int(num**0.5)+1):
if num % i == 0:
print("Not Prime")
break
else:
print("Prime Number")
7. Reverse a string
s = input("Enter a string: ")
rev = s[::-1]
print("Reversed string:", rev)
8. Sum of digits of a number
num = int(input("Enter a number: "))
total = 0
while num > 0:
total += num % 10
num = num // 10
print("Sum of digits:", total)
9. Find the second largest number in a list
numbers = [10, 25, 5, 100, 50]
numbers.sort()
print("Second largest:", numbers[-2])
10. Count vowels in a string
s = input("Enter a string: ")
vowels = "aeiouAEIOU"
count = 0
for char in s:
if char in vowels:
count += 1
print("Number of vowels:", count)
11. sum of digits repeatedly until the number becomes a single digit
def sum_of_digits(num):
while num >= 10:
total = 0
while num > 0:
total += num % 10
num = num // 10
num = total
return num
number = int(input("Enter a number: "))
result = sum_of_digits(number)
print("Single digit sum is:", result)
12. Reverse a number (e.g., 123 → 321)
num = int(input("Enter a number: "))
rev = 0
while num > 0:
digit = num % 10
rev = rev * 10 + digit
num = num // 10
print("Reversed number:", rev)
13. Find sum of elements in a list using sum() and without sum()
Using built-in:
lst = [1, 2, 3, 4, 5]
print("Sum:", sum(lst))
Without built-in:
total = 0
for num in lst:
total += num
print("Sum:", total)
14. Count frequency of each character in a string
s = input("Enter a string: ")
freq = {}
for char in s:
freq[char] = freq.get(char, 0) + 1
for k, v in freq.items():
print(k, ":", v)
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