Python

23) To confirm given number is double digit number

n = int(input("Enter a positive number: "))
count = 0
while n > 0:
    count += 1
    n= n // 10
if count == 2:
    print("It is a double-digit number.")
else:
    print("It is not a double-digit number.")

Output:
Enter a positive number: 12
It is a double-digit number.

n = int(input("Enter a number: "))
if 10 <= n <= 99:
    print("It is a double-digit number.")
else:
    print("It is not a double-digit number.")

Output:
Enter a number: 123
It is not a double-digit number.

24)Neon Number
A neon number is a number where the sum of digits of square of the number is equal to the number (9*9=81,8+1=9)

def neon(n):
    square = n * n
    sum = 0
    while square > 0:
        sum = sum+square % 10
        square=square // 10
    return sum == n
n = int(input("Enter a number: "))
if neon(n):
    print("Neon Number")
else:
    print("Not a Neon Number")

Output:
Enter a number: 9
Neon Number

n= int(input("Enter a number: "))
square = n * n
sum = 0
while square > 0:
    sum = sum + (square % 10)
    square = square // 10
if sum == n:
    print("Neon Number")
else:
    print("Not a Neon Number")

Output:
Enter a number: 5
Not a Neon Number

25)Strong Number
Strong Numbers are the numbers whose sum of factorial of digits is equal to the original number
n=145
1! = 1
4! = 24
5! = 120
1 + 24 + 120 = 145

def strong(n):
    original = n
    sum = 0
    while n > 0:
        digit = n % 10
        fact = 1
        i = 1
        while i <= digit:
            fact = fact * i
            i = i + 1
        sum = sum + fact
        n = n // 10
    return sum == original
n = int(input("Enter a number: "))
if strong(n):
    print("Strong Number")
else:
    print("Not a Strong Number")

Output:
Enter a number: 145
Strong Number

n = int(input("Enter a number: "))
sum = 0
while n> 0:
    digit = n % 10
    fact = 1
    i = 1
    while i <= digit:
        fact = fact * i
        i = i + 1
    sum = sum + fact
    n = n // 10
if sum == n:
    print("Strong Number")
else:
    print("Not a Strong Number")

Output:
Enter a number: 123
Not a Strong Number

Automorphic Number
An automorphic number is a number whose square ends in the same digits as the number itself
n=5
5^2 = 25

def automorphic(n):
    original = n
    square = n * n
    div = 1
    while n > 0:
        div = div * 10
        n = n // 10
    return square % div == original
n = int(input("Enter a number: "))
if automorphic(n):
    print("Automorphic Number")
else:
    print("Not an Automorphic Number")

Output:
Enter a number: 6
Automorphic Number

n = int(input("Enter a number: "))
original = n
square = n * n
div = 1
while n > 0:
    div = div * 10
    n = n // 10
if square % div == original:
    print("Automorphic Number")
else:
    print("Not an Automorphic Number")

Output:
Enter a number: 7
Not an Automorphic Number

Duck Number
Duck Number is a positive non-zero number containing at least one zero in its numeric representation(10,1203,5104)

def duck(n):
    while n > 0:
        digit = n % 10
        if digit == 0:
            return True
        n = n // 10
    return False
n = int(input("Enter a number: "))
if duck(n):
    print("Duck Number")
else:
    print("Not a Duck Number")

Output:
Enter a number: 12
Not a Duck Number

n = int(input("Enter a number: "))
while n > 0:
    digit = n % 10
    if digit == 0:
        print("Duck Number")
        break
    n = n // 10
else:
    print("Not a Duck Number")

Output:
Enter a number: 120
Duck Number

Spy Number
if the sum of all the digits is equal to the multiple of all digits
n=123
sum=1+2+3=6
multiple=1*2*3=6

def spy(n):
    sum = 0
    mul = 1
    while n > 0:
        digit = n % 10
        sum = sum + digit
        mul = mul * digit
        n = n // 10
    return sum == mul
n = int(input("Enter a number: "))
if spy(n):
    print("Spy Number")
else:
    print("Not a Spy Number")

Output:
Enter a number: 123
Spy Number

n = int(input("Enter a number: "))
sum = 0
mul = 1
while n > 0:
    digit = n % 10
    sum = sum + digit
    mul = mul * digit
    n = n // 10
if sum == mul:
    print("Spy Number")
else:
    print("Not a Spy Number")

Output:
Enter a number: 1234
Not a Spy Number