WHILE LOOP:
===========

# WAP TO COUNT THE NUMBER OF DIGITS IN A GIVEN NUMBER.

# for the counting of digits in number, no method is available.
# convert a number ==> string
# find the length of the string ==> count digits of number

num = int(input("Enter a value:"))

num_str = str(num)  # convert a number into a string

print(type(num))
print(type(num_str))

"""
len() ==> pre-defined method
    used to find the number of characters in a given string.
Syntax:
    len|(str_data)
"""

print("The number of digits of",num,"is = ",len(num_str))

===================================

# WAP IN PYTHON TO CHECK WHETHER THE GIVEN NUMBER IS PALINDROME NUMBER OR NOT.

"""
NUMBER
FIND REVERSE
    REVERSE = 0
    REVERSE = REVERSE * 10 + IND_DIG
REVERSE == NUMBER ==> PALINDROME NUMBER
1 x 10 = 10
10 x 10 = 100
100 x 10 = 1000
"""

num = int(input("Enter a decimal value:")) # 1221

n = num # n = 1221
rev_num = 0

while n != 0:
    ind_dig = n % 10    # 1 2 2 1
    rev_num = rev_num * 10 + ind_dig    # 1221
    n //= 10    # 122//10 ==> 12//10 ==> 1//10 ==> 0

if rev_num == num:
    print(num,"is a palindrome number.")
else:
    print(num,"is not a palindrome number.")

==========================

# WAP TO FIND WHETHER A GIVEN NUMBER IS ARMSTRONG NUMBER OR NOT.

"""
3-DIGIT: XYZ
X^3 + Y^3 + Z^3 == XYZ ==> ARMSTRONG NUMBER

4-DIGIT: ABCD
A^4 + B^4 + C^4 + D^4 == ABCD
"""

num = int(input("Enter a number:"))  # 1234

cnt_dig = len(str(num))  # 4

n = num  # n = 1234
s_dig = 0

while n > 0:
    ind_dig = n % 10  # 4 3 2 1
    powers = ind_dig ** cnt_dig  # 64 81 16 1
    s_dig += powers  # 64 + 81 + 16 + 1
    n //= 10  # 123//10 == 12//10 == 1//10 == 0

if s_dig == num:
    print(num, "is an armstrong number.")
else:
    print(num, "is not an armstrong number.")