while.py

#  ┌──► while condition:
#  │        |----------------------|
#  │        |  True Statements     |
#  │        |----------------------|
#  │        |  Update Expression   |
#  └────────|  (e.g., i += 1)      |
#           |----------------------|

# 1. WAP to print 1 to 5 numbers using while loop.
# n = 1
# while n < 6:
#     print(n)
#     n += 1

# 1 → 2 → 3 → 4 → 5
# n += 1 → n = n + 1

"""
1
2
3
4
5
"""


# 2. WAP to print 1 to 10 numbers using while loop.
# n = 1
# while n <= 10:
#     print(n)
#     n += 1

# 1 → 2 → 3 → ... → 10

"""
1
2
3
4
5
6
7
8
9
10
"""


# 3. WAP to print hello python 5 times using while loop.
# n = 1
# while n < 6:
#     print("hello python")
#     n += 1

# 1 → 2 → 3 → 4 → 5

"""
hello python
hello python
hello python
hello python
hello python
"""


# 4. WAP to print numbers from 10 to 1 using while loop.
# i = 10
# while i > 0:
#     print(i)
#     i -= 1

# 10 → 9 → 8 → ... → 1
# i -= 1 → i = i - 1

"""
10
9
8
7
6
5
4
3
2
1
"""


#   5. WAP to print even numbers from 1 to 10 using while loop.
# i = 1
# while i < 11:
#     if i % 2 == 0:
#         print(i, end=" ")
#     i += 1

# %2 == 0 → even
# 2 4 6 8 10

"""
2 4 6 8 10
"""


#  : 6. WAP to print odd numbers from 1 to n using while loop.
# n = int(input("enter a number: "))
# i = 1
# while i < n + 1:
#     if i % 2 != 0:
#         print(i, end=" ")
#     i += 1

# %2 != 0 → odd
# 1 3 5 7 ...

"""
enter a number: 20
1 3 5 7 9 11 13 15 17 19
"""


#   7. WAP to print nth table using while loop.
# n = int(input("enter a number: "))
# i = 1
# while i < n + 1:
#     print(f"{n} * {i} = {i * n}")
#     i += 1

# 15*1=15
# 15*2=30
# 15*3=45

"""
enter a number: 15
15 * 1 = 15
15 * 2 = 30
15 * 3 = 45
15 * 4 = 60
15 * 5 = 75
15 * 6 = 90
15 * 7 = 105
15 * 8 = 120
15 * 9 = 135
15 * 10 = 150
15 * 11 = 165
15 * 12 = 180
15 * 13 = 195
15 * 14 = 210
15 * 15 = 225
"""


#   8. WAP to reverse the given number without using type casting using while loop.
# n = int(input("enter a number: "))
# rev = 0
# while n > 0:
#     rev = rev * 10 + n % 10
#     n = n // 10
# print(rev)

# 0*10+6 = 6
# 6*10+5 = 65
# 65*10+2 = 652

# 256//10 = 25
# 25//10 = 2
# 2//10 = 0

"""
enter a number: 256
652
"""


#   9. WAP to check whether given number is palindrome or not using while loop.
# n = int(input("enter a number: "))
# temp = n
# rev = 0
# while n > 0:
#     rev = rev * 10 + n % 10
#     n = n // 10
# if rev == temp:
#     print("it is a palindrome")
# else:
#     print("not a palindrome")

# 1*10 = 10
# 10+2 = 12
# 12*10 = 120
# 120+1 = 121

"""
enter a number: 121
it is a palindrome

enter a number: 153
not a palindrome
"""


#   10. WAP to traverse through a string using while loop.
# st = input("enter a string: ")
# i = 0
# while len(st) > i:
#     print(st[i])
#     i += 1

# h → e → l → l → o
# st[0] st[1] st[2] ...

"""
enter a string: hello
h
e
l
l
o
"""


#   11. WAP to reverse a string using while loop.
# s = input("enter a string: ")
# i = 0
# rev = ""
# while i < len(s):
#     rev = s[i] + rev
#     i += 1
# print(rev)

# h+"" = h
# e+h = eh
# l+eh = leh
# o+lleh = olleh

"""
enter a string: hello
olleh
"""


#   12. WAP to check whether given string is palindrome or not using while loop.
# s = input("enter a string: ")
# i = 0
# rev = ""
# while i < len(s):
#     rev = s[i] + rev
#     i += 1
# if rev == s:
#     print(f"{s} is palindrome")
# else:
#     print(f"{s} is not palindrome")

# mom == mom
# malayalam == malayalam

"""
enter a string: mom
mom is palindrome

enter a string: hello
hello is not palindrome

enter a string: malayalam
malayalam is palindrome
"""


#   13. WAP to convert uppercase letters into lowercase and lowercase letters into uppercase without using string methods using while loop.

# By using string methods
# n = input("enter a string: ")
# i = 0
# res = ""
# while i < len(n):
#     if n[i].isupper():
#         res = res + n[i].lower()
#     else:
#         res = res + n[i].upper()
#     i += 1
# print(res)

# H → h
# e → E
# L → l

"""
enter a string: HeLlo
hElLO
"""


# Without using string methods
# s = input("enter a string: ")
# i = 0
# res = ""
# while i < len(s):
#     if ord("A") <= ord(s[i]) <= ord("Z"):
#         res = res + chr(ord(s[i]) + 32)
#     else:
#         res = res + chr(ord(s[i]) - 32)
#     i += 1
# print(res)

# 65-90 → A-Z
# +32 → a-z
# -32 → A-Z

"""
enter a string: HeLlo
hElLO
"""


#   14. WAP to print fibonacci series using while loop.
# n = int(input("enter a number: "))
# a = 0
# b = 1
# print(a, b, end=" ")
# i = 1
# while i <= n - 2:
#     c = a + b
#     print(c, end=" ")
#     a = b
#     b = c
#     i += 1

# 0+1 = 1
# 1+1 = 2
# 1+2 = 3
# 2+3 = 5

"""
0 1 1 2 3 5 8 13 21 34
"""

#   15. WAP to print factorial of a given number using while loop.
# n = 5
# fact = 1

# while n > 0:
#     fact = fact * n
#     n -= 1

# print(fact)

# 1*5 = 5
# 5*4 = 20
# 20*3 = 60
# 60*2 = 120
# 120*1 = 120

"""
120
"""

#   16. WAP to check whether a given number is perfect square or not.
# n = int(input("enter a number: "))
# temp = n ** 0.5

# if temp == temp // 1:
#     print(f"{n} is a perfect square")
# else:
#     print(f"{n} is not a perfect square")

# 25 ** 0.5 = 5.0
# 5.0 // 1 = 5.0

"""
enter a number: 25
25 is a perfect square

enter a number: 20
20 is not a perfect square
"""


#   17. WAP to check whether a given number is perfect number or not using while loop.
# n = int(input("enter a number: "))
# i = 1
# sum = 0

# while i <= n // 2:
#     if n % i == 0:
#         sum += i
#     i += 1

# if sum == n:
#     print(f"{n} is a perfect number")
# else:
#     print(f"{n} is not a perfect number")

# 6 % 1 = 0  → sum = 0+1 = 1
# 6 % 2 = 0  → sum = 1+2 = 3
# 6 % 3 = 0  → sum = 3+3 = 6

"""
enter a number: 6
6 is a perfect number

enter a number: 10
10 is not a perfect number
"""


#   18. WAP to print sum of digits present in a number using while loop.
# n = int(input("enter a number: "))
# sum = 0

# while n > 0:
#     sum += n % 10
#     n //= 10

# print(sum)

# 0+4 = 4
# 4+3 = 7
# 7+2 = 9
# 9+1 = 10

"""
enter a number: 1234
10
"""


#   19. WAP to check whether a given number is harshad number or not using while loop.
# n = int(input("enter a number: "))
# num = n
# sum = 0

# while n > 0:
#     sum += n % 10
#     n //= 10

# if num % sum == 0:
#     print(f"{num} is a harshad number")
# else:
#     print(f"{num} is not a harshad number")

# 18 % 10 = 8   → sum = 8
# 1 % 10 = 1    → sum = 8+1 = 9
# 18 % 9 = 0

"""
enter a number: 18
18 is a harshad number

enter a number: 19
19 is not a harshad number
"""


#   20. WAP to check whether a given number is strong number or not using while loop.
# n = int(input("enter a number: "))
# num = n
# sum = 0

# while n > 0:
#     digit = n % 10
#     fact = 1

#     while digit > 0:
#         fact *= digit
#         digit -= 1

#     sum += fact
#     n //= 10

# if sum == num:
#     print(f"{num} is a strong number")
# else:
#     print(f"{num} is not a strong number")

# 5! = 5*4*3*2*1 = 120
# 4! = 4*3*2*1 = 24
# 1! = 1
# 120+24+1 = 145

"""
enter a number: 145
145 is a strong number

enter a number: 123
123 is not a strong number
"""

#   21. WAP to traverse through a list and check whether the word length is even or odd, if even add as it is else reverse the word and add to a new list using while loop.
# lst1 = ["apple", "even", "odd", "hi", "spider"]
# i = 0
# lst2 = []
# while i < len(lst1):
# len(word) % 2 == 0 --> even length
# len(word) % 2 != 0 --> odd length

#     if len(lst1[i]) % 2 == 0:
#         lst2.append(lst1[i])
#     else:
#         lst2.append(lst1[i][::-1])
#     i += 1
# print(lst2)

# apple  --> odd  --> elppa
# even   --> even --> even
# odd    --> odd  --> ddo
# hi     --> even --> hi
# spider --> even --> spider

"""
['elppa', 'even', 'ddo', 'hi', 'spider']
"""

#   22. WAP to traverse through a list and check whether the word starts with vowel or consonant, if vowel add as it is else reverse the word and add to a new list using while loop.
# lst1 = ["apple", "even", "odd", "hi", "spider"]
# i = 0
# lst2 = []
# while i < len(lst1):
# word[0] --> first letter in "aeiouAEIOU" --> vowel checking

#     if lst1[i][0] in "aeiouAEIOU":
#         lst2.append(lst1[i])
#     else:
#         lst2.append(lst1[i][::-1])
#     i += 1
# print(lst2)

# apple  --> starts with vowel     --> apple
# even   --> starts with vowel     --> even
# odd    --> starts with vowel     --> odd
# hi     --> starts with consonant --> ih
# spider --> starts with consonant --> redips


"""
['apple', 'even', 'odd', 'ih', 'redips']
"""

#   23. WAP to traverse through a list and create a new list with tuple of word and index if word length is even else word and length of the word using while loop.
# lst1 = ["facebook", "insta", "whatsapp", "twitter"]
# i = 0
# lst2 = []
# while i < len(lst1):
#     if len(lst1[i]) % 2 == 0:
#         lst2.append((lst1[i], i))
#     else:
#         lst2.append((lst1[i], len(lst1[i])))
#     i += 1
# print(lst2)

# len(word) % 2 == 0 --> even length
# even  --> (word, index)
# odd   --> (word, length)

# facebook --> len=8 --> even --> ('facebook',0)
# insta --> len=5 --> odd --> ('insta',5)
# whatsapp --> len=8 --> even --> ('whatsapp',2)
# twitter --> len=7 --> odd --> ('twitter',7)

"""
[('facebook', 0), ('insta', 5), ('whatsapp', 2), ('twitter', 7)]
"""

#   24. WAP to create a list with word and reverse word pair inside a tuple using while loop.
# lst1 = ["facebook", "insta", "whatsapp", "twitter"]
# i = 0
# lst2 = []
# while i < len(lst1):
#     lst2.append((lst1[i], lst1[i][::-1]))
#     i += 1
# print(lst2)

"""
[('facebook', 'koobecaf'), ('insta', 'atsni'), ('whatsapp', 'ppastahw'), ('twitter', 'rettiwt')]
"""

#   25. WAP to create a dictionary with key as word and value as index of the word using while loop.

# lst = ["apple", "mango", "grapes", "orange"]

# d = {}
# i = 0

# while i < len(lst):
# dictionary[key] = value
# key   --> word
# value --> index

#     d[lst[i]] = i

#     i += 1

# print(d)

# apple  --> index 0
# mango  --> index 1
# grapes --> index 2
# orange --> index 3

"""
{'apple': 0, 'mango': 1, 'grapes': 2, 'orange': 3}
"""

#   26. WAP to create a dictionary with key as word and value as index if word length is even else length of the word using while loop.
# lst = ["apple", "mango", "grapes", "orange"]
# i = 0
# d = {}
# while i < len(lst):
#     if len(lst[i]) % 2 == 0:
#         d[lst[i]] = i
#     else:
#         d[lst[i]] = len(lst[i])
#     i += 1
# print(d)

# len(word) % 2 == 0 --> even length
# even --> value = index
# odd --> value = length of word

# apple  --> len=5 --> odd  --> {'apple':5}
# mango  --> len=5 --> odd  --> {'mango':5}
# grapes --> len=6 --> even --> {'grapes':2}
# orange --> len=6 --> even --> {'orange':3}

"""
{'apple': 5, 'mango': 5, 'grapes': 2, 'orange': 3}
"""


#   27. WAP to create a dictionary with key as number and value as square of the number if even else cube of the number using while loop.
# lst = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
# i = 0
# d = {}
# while i < len(lst):
#     if lst[i] % 2 == 0:
#         d[lst[i]] = lst[i] ** 2
#     else:
#         d[lst[i]] = lst[i] ** 3
#     i += 1
# print(d)

"""
{1: 1, 2: 4, 3: 27, 4: 16, 5: 125, 6: 36, 7: 343, 8: 64, 9: 729, 0: 0}
"""

#   28. WAP to print numbers from n to 1 using while loop.
# n = int(input("enter a number: "))
# while n > 0:
#     print(n, end=" ")
#     n -= 1

"""
enter a number: 25
25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 
"""

#   29. WAP to print sum of first n natural numbers using while loop.

# n = int(input("enter a number: "))

# i --> starts from 1
# sum --> stores total

# 1+2+3+4+5 = 15

# i=1 --> sum=0+1 = 1
# i=2 --> sum=1+2 = 3
# i=3 --> sum=3+3 = 6
# i=4 --> sum=6+4 = 10
# i=5 --> sum=10+5 = 15

# i = 1
# sum = 0

# while i <= n:
#     sum = sum + i
#     i += 1

# print(sum)

"""
enter a number: 5
15
"""

#   30. WAP to print multiplication table in reverse order using while loop.

# n = int(input("enter a number: "))

# i --> starts from 10
# reverse table --> 10 to 1

# 5 * 10 = 50
# 5 * 9 = 45
# 5 * 8 = 40

# i = 10

# while i >= 1:
#     print(f"{n} * {i} = {n*i}")
#     i -= 1

"""
enter a number: 5

5 * 10 = 50
5 * 9 = 45
5 * 8 = 40
5 * 7 = 35
5 * 6 = 30
5 * 5 = 25
5 * 4 = 20
5 * 3 = 15
5 * 2 = 10
5 * 1 = 5
"""

#   31. WAP to count vowels and consonants in a string using while loop.

# s = input("enter a string: ")

# vowel --> aeiou
# consonant --> remaining alphabets

# hello
# e,o --> vowels = 2
# h,l,l --> consonants = 3

# i --> traverses string
# v --> vowel count
# c --> consonant count

# i = 0
# v = 0
# c = 0

# while i < len(s):

#     if s[i] in "aeiouAEIOU":
#         v += 1

#     else:
#         c += 1

#     i += 1

# print(f"vowels = {v}")
# print(f"consonants = {c}")

"""
enter a string: hello
vowels = 2
consonants = 3
"""

#   32. WAP to print numbers from 1 to 50 divisible by 5 using while loop.
# n = 50
# i = 1
# while i <= n:
#     if i % 5 == 0:
#         print(i, end=" ")
#     i += 1

"""
5 10 15 20 25 30 35 40 45 50
"""

#   33. WAP to print numbers from 50 to 1 using while loop.
# n = 50
# while n > 0:
#     print(n, end=" ")
#     n -= 1

"""
50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
"""
#   34. WAP to print square of numbers from 1 to n using while loop.
# n = int(input("enter a number: "))
# i = 1
# while i < n + 1:
#     print(f"square of {i} is {i**2}")
#     i += 1

"""
enter a number: 15
square of 1 is 1
square of 2 is 4
square of 3 is 9
square of 4 is 16
square of 5 is 25
square of 6 is 36
square of 7 is 49
square of 8 is 64
square of 9 is 81
square of 10 is 100
square of 11 is 121
square of 12 is 144
square of 13 is 169
square of 14 is 196
square of 15 is 225
"""
#   35. WAP to print cube of numbers from 1 to n using while loop.
# n = int(input("enter a number: "))
# i = 1
# while i < n + 1:
#     print(f"cube of {i} is {i**3}")
#     i += 1

"""
enter a number: 9
cube of 1 is 1
cube of 2 is 8
cube of 3 is 27
cube of 4 is 64
cube of 5 is 125
cube of 6 is 216
cube of 7 is 343
cube of 8 is 512
cube of 9 is 729
"""

#   36. WAP to count number of digits in a given number using while loop.

# n = int(input("enter a number: "))

# 12345
# 1234 --> 123 --> 12 --> 1 --> 0

# count --> stores digit count

# count=0+1=1
# count=1+1=2
# count=2+1=3

# count = 0

# while n > 0:
#     count += 1
#     n = n // 10

# print(count)

"""
enter a number: 12345
5
"""

#   37. WAP to print sum of even digits in a given number using while loop.

# n = int(input("enter a number: "))

# 123456
# even digits --> 2 4 6
# sum --> 12

# n%10 --> last digit
# n//10 --> removes last digit

# sum = 0

# while n > 0:

#     digit = n % 10

#     if digit % 2 == 0:
#         sum += digit

#     n = n // 10

# print(sum)

"""
enter a number: 123456
12
"""

#   38. WAP to print product of digits in a given number using while loop.

# n = int(input("enter a number: "))

# 1234
# 1*2*3*4 = 24

# product=1*4=4
# product=4*3=12
# product=12*2=24

# product = 1

# while n > 0:
#     product *= n % 10
#     n = n // 10

# print(product)

"""
enter a number: 1234
24
"""

#   39. WAP to check whether a given number is spy number or not using while loop.

# Spy Number
# sum of digits == product of digits

# 123
# sum = 1+2+3 = 6
# product = 1*2*3 = 6

# n = int(input("enter a number: "))
# temp = n

# sum = 0
# product = 1

# while n > 0:

#     digit = n % 10

#     sum += digit
#     product *= digit

#     n = n // 10

# if sum == product:
#     print("spy number")

# else:
#     print("not a spy number")

"""
enter a number: 123
spy number

enter a number: 124
not a spy number
"""

#   40. WAP to check whether a given number is neon number or not using while loop.

# Neon Number
# sum of digits of square == original number

# 9
# 9*9 = 81
# 8+1 = 9

# n = int(input("enter a number: "))

# square = n * n
# sum = 0

# while square > 0:

#     sum += square % 10
#     square = square // 10

# if sum == n:
#     print("neon number")

# else:
#     print("not a neon number")

"""
enter a number: 9
neon number

enter a number: 8
not a neon number
"""

#   41. WAP to print all factors of a given number using while loop.

# factor --> number completely divides another number

# 12
# 1 2 3 4 6 12

# 12%1==0
# 12%2==0
# 12%3==0

# n = int(input("enter a number: "))

# i = 1

# while i <= n:

#     if n % i == 0:
#         print(i, end=" ")

#     i += 1

"""
enter a number: 12
1 2 3 4 6 12
"""

#   42. WAP to check whether a given number is prime or not using while loop.

# Prime Number
# has only 2 factors --> 1 and itself

# 7 --> 1,7
# 5 --> 1,5

# n = int(input("enter a number: "))

# i = 1
# count = 0

# while i <= n:

#     if n % i == 0:
#         count += 1

#     i += 1

# if count == 2:
#     print("prime number")

# else:
#     print("not a prime number")

"""
enter a number: 7
prime number

enter a number: 8
not a prime number
"""

#   43. WAP to print prime numbers from 1 to n using while loop.

# n = int(input("enter a number: "))

# num = 1

# while num <= n:

#     i = 1
#     count = 0

#     while i <= num:

#         if num % i == 0:
#             count += 1

#         i += 1

#     if count == 2:
#         print(num, end=" ")

#     num += 1

"""
enter a number: 20
2 3 5 7 11 13 17 19
"""

#   44. WAP to print multiplication tables from 1 to 5 using nested while loop.

# outer loop --> tables
# inner loop --> multiplication

# 1*1=1
# 1*2=2

# 2*1=2
# 2*2=4

# table = 1

# while table <= 5:

#     i = 1

#     while i <= 10:
#         print(f"{table} * {i} = {table*i}")
#         i += 1

#     print()

#     table += 1

"""
1 * 1 = 1
1 * 2 = 2
...

5 * 10 = 50
"""

#   45. WAP to count uppercase and lowercase letters in a string using while loop.

# HeLLo
# uppercase --> H L L
# lowercase --> e o

# upper = 3
# lower = 2

# s = input("enter a string: ")

# i = 0
# upper = 0
# lower = 0

# while i < len(s):

#     if "A" <= s[i] <= "Z":
#         upper += 1

#     elif "a" <= s[i] <= "z":
#         lower += 1

#     i += 1

# print(f"uppercase = {upper}")
# print(f"lowercase = {lower}")

"""
enter a string: HeLLo
uppercase = 3
lowercase = 2
"""

#   46. WAP to remove spaces from a string using while loop.

# s = input("enter a string: ")

# hello world
# helloworld

# i = 0
# res = ""

# while i < len(s):

#     if s[i] != " ":
#         res += s[i]

#     i += 1

# print(res)

"""
enter a string: hello world
helloworld
"""

#   47. WAP to print characters present at even index positions in a string using while loop.

# python
# index --> 0 1 2 3 4 5
# chars --> p y t h o n

# even index --> 0 2 4
# output --> p t o

# s = input("enter a string: ")

# i = 0

# while i < len(s):

#     if i % 2 == 0:
#         print(s[i], end=" ")

#     i += 1

"""
enter a string: python
p t o
"""

#   48. WAP to create a list with length of each word using while loop.

# lst = ["apple", "hi", "python"]

# apple --> 5
# hi --> 2
# python --> 6

# output --> [5,2,6]

# lst = ["apple", "hi", "python"]

# i = 0
# res = []

# while i < len(lst):

#     res.append(len(lst[i]))

#     i += 1

# print(res)

"""
[5, 2, 6]
"""

#   49. WAP to create a dictionary with word as key and reverse word as value using while loop.

# apple --> elppa
# hi --> ih

# {'apple':'elppa'}

# lst = ["apple", "hi", "python"]

# i = 0
# d = {}

# while i < len(lst):

#     d[lst[i]] = lst[i][::-1]

#     i += 1

# print(d)

"""
{'apple': 'elppa', 'hi': 'ih', 'python': 'nohtyp'}
"""

#   50. WAP to check whether a given number is automorphic number or not using while loop.

# Automorphic Number
# number ending digits == square ending digits

# 5 --> 25
# 6 --> 36
# 25 --> 625

# n = int(input("enter a number: "))

# square = n * n

# if str(square).endswith(str(n)):
#     print("automorphic number")

# else:
#     print("not automorphic number")

"""
enter a number: 25
automorphic number

enter a number: 12
not automorphic number
"""