Que-1. Write a program to display product of the digits of a number accepted from the user.

num = int(input("Enter any number : "))

temp = num
product = 1;

while(temp != 0):

    product = product * (temp % 10);

    # Remove last digit from temp.
    temp = int(temp / 10)

print("\nProduct of all digits in", num, ":", product)

Que-2. Write a program to find the sum of the digits of a number accepted from user.

n=int(input("Enter a number:"))
tot=0
while(n>0):
    dig=n%10
    tot=tot+dig
    n=n//10
print("The total sum of digits is:",tot)

Que-3. Write a program to check whether a number is prime or not.

num = int(input("Enter a number: "))
flag = False

if num > 1:

    for i in range(2, num):
        if (num % i) == 0:
            flag = True
            break
if flag:
    print(num, "is not a prime number")
else:
    print(num, "is a prime number")

Que-4. Write program to print the following pattern.

a)

1

1 2

1 2 3

1 2 3 4

rows = int(input("Enter the number of rows: "))   
for i in range(1, rows+1):  
    for j in range(1, i + 1):  
        print(j, end=' ')  
    print("")  

b)

* * * *

* * *

* *

*

rows = 4
for i in range(rows + 1, 0, -1):
    for j in range(0, i - 1):
        print("*", end=' ')
    print(" ")


Que-5. Accept 10 numbers from the user and display their average.

num = int(input('How many numbers: '))
total_sum = 0

for n in range(num):
    numbers = float(input('Enter number : '))
    total_sum += numbers

avg = total_sum/num
print('Average of ', num, ' numbers is :', avg)

Que-6. Write a program to display all the numbers which are divisible by 13 but not by 2 between 100 and 500.

Que-7. Write a program to print the following pattern

5 5 5 5 5
4 4 4 4
3 3 3
2 2
1

rows = 5
for i in range(rows, 0, -1):
    num = i
    for j in range(0, i):
        print(num, end=' ')
    print("\r")

Que-8. Write a program to accept decimal number and display its binary number.

def decimalToBinary(n):
	return bin(n).replace("0b", "")
if __name__ == '__main__':
	print(decimalToBinary(8))

Que-9. Accept a number from user and check whether it is palindrome or not.

num=int(input("Enter a number:"))
temp=num
rev=0
while(num>0):
    dig=num%10
    rev=rev*10+dig
    num=num//10
if(temp==rev):
    print("The number is palindrome!")
else:
    print("Not a palindrome!")

Que-10.Write a program to accept a number and check whether it is a perfect number or not.

n = int(input("Enter any number: "))
sum1 = 0
for i in range(1, n):
    if(n % i == 0):
        sum1 = sum1 + i
if (sum1 == n):
    print("The number is a Perfect number!")
else:
    print("The number is not a Perfect number!")

Que-11. Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word

def lengthOfLastWord(a):
	l = 0
	x = a.strip()

	for i in range(len(x)):
		if x[i] == " ":
			l = 0
		else:
			l += 1
	return l
if __name__ == "__main__":
	inp = "Gajendra Singh Thakur "
	print("The length of last word is",
				lengthOfLastWord(inp))

Que-12. Mr. John is making a website, in which there is a tab to create a password. 
As other websites, there are rules so that the password gets complex and none can predict the  password for another. 
So he gave some rules like:
	1. At least one numeric digit 
	2. At Least one Small/Lowercase Letter 
	3. At Least one Capital/Uppercase Letter 
	4. Must not have space
	5. Must not have slash (/)
	6. At least/Minimum 6 characters

	If someone inputs an invalid password, the code prints: 
		“Invalid password, try again”.
	Otherwise, it prints: 
		“password valid”.
	Input Format:
		A line with a given string as a password
	Output Format:
		If someone inputs an invalid password, the code prints: 
			“Invalid password, try again”.
	Otherwise, it prints: 
		“password valid”, without the quotation marks.
	Constraints:
		Number of character in the given string <=10^9
		Sample input 1:
			abcDeF012
		Sample output 1:
			password valid
		Sample input 2:
			abcDefGH
		Sample output 2:
			Invalid password, try again
		Note: Without using any pythons library like(re, string etc)