Mind Blowing While Loop program for beginner
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1. Write a python program to print all natural numbers from 1 to n. – using while loop
n= int(input("Enter n= "))
i=1
print("all natural numbers from 1 to n are:")
while i>=1 and i<=n:
print(i,end=" ")
i+=1
Output:
Enter n= 10
all natural numbers from 1 to n are:
1 2 3 4 5 6 7 8 9 10
2. Write a python program to print all natural numbers in reverse (from n to 1). – using while loop
n= int(input("Enter n= "))
i=n
print("all natural numbers in reverse (from n to 1) are:")
while i<=n and i>=1:
print(i,end=" ")
i-=1
Output:
Enter n= 10
all natural numbers in reverse (from n to 1) are:
10 9 8 7 6 5 4 3 2 1
3. Write a python program to print all alphabets from a to z. – using while loop
i=97
print("all alphabets from a to z are:")
while i<=122:
print(chr(i),end=" ")
i+=1
Output:
all alphabets from a to z are:
a b c d e f g h i j k l m n o p q r s t u v w x y z
4. Write a python program to print all even numbers between 1 to 100. - using while loop
i=2
print("all even number between 1 to 100 are:")
while i<100:
if i % 2==0:
print(i, end=" ")
i+=1
Output:
all even number between 1 to 100 are:
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98
5. Write a python program to print all odd number between 1 to 100.
i=2
print("all odd number between 1 to 100 are:")
while i<100:
if i % 2!=0:
print(i, end=" ")
i+=1
Output:
all odd number between 1 to 100 are:
3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99
6. Write a python program to find sum of all natural numbers between 1 to n.
n= int(input("Enter n= "))
i=2
s=0
while i<n:
s=s+i
i+=1
print("sum of all natural numbers between 1 to n= ", s)
Output:
Enter n= 10
sum of all natural numbers between 1 to n= 44
7. Write a python program to find sum of all even numbers between 1 to n.
n= int(input("Enter n= "))
i=2
s=0
while i<n:
if i % 2==0:
s=s+i
i+=1
print("sum of all even numbers between 1 to n= ", s)
Output:
Enter n= 10
sum of all even numbers between 1 to n= 20
8. Write a python program to find sum of all odd numbers between 1 to n.
n= int(input("Enter n= "))
i=2
s=0
while i<n:
if i % 2!=0:
s=s+i
i+=1
print("sum of all odd numbers between 1 to n= ", s)
Output:
Enter n= 10
sum of all odd numbers between 1 to n= 24
9. Write a python program to print multiplication table of any number.
n= int(input("Enter any number= "))
m=n
i=1
print("multiplication table of", n, "are:")
while i<=10:
print(m, end=" ")
m = m + n
i+=1
Output:
Enter any number= 10
multiplication table of 10 are: 10 20 30 40 50 60 70 80 90 100
10. Write a python program to count number of digits in a number.
n= int(input("Enter any number= "))
i=0
while n!=0:
n=n//10
i+=1
print("Total number of digits in your number is ", i)
Output:
Enter any number= 10
Total number of digits in your number is 2
11. Write a python program to find first and last digit of a number.
n= int(input("Enter any number= "))
i=0
m=n
while n!=0:
n=n//10
i+=1
f=m//10**(i-1)
print("first digit of your number are ", f)
t=m//10
l=m-t*10
print("last digit of your number are ", l)
Output:
Enter any number= 123456
first digit of your number are 1 last digit of your number are 6
12. Write a python program to find sum of first and last digit of a number.
n= int(input("Enter any number= "))
i=0
m=n
while n!=0:
n=n//10
i+=1
f=m//10**(i-1)
t=m//10
l=m-t*10
s=f+l
print("sum of first and last digit of your number are ",s)
Output:
Enter any number= 123456
sum of first and last digit of your number are 7
13. Write a python program to calculate sum of digits of a number.
n = int(input("enter any number "))
f = n
i = 0
while n > 0:
n = n // 10
i += 1
add = 0
while i > 0:
f1 = f // (10 ** (i - 1))
add = add + f1
f2 = f - (f1 * (10 ** (i - 1)))
f = f2
i -= 1
Output:
enter any number 123456
Sum of digit of your number is 21
14. Write a python program to calculate product of digits of a number.
n = int(input("enter any number "))
f = n
i = 0
while n > 0:
n = n // 10
i += 1
c = i
mul = 1
while c > 0:
f1 = f // (10 ** (c - 1))
mul = mul * f1
f2 = f - (f1 * (10 ** (c - 1)))
f = f2
c -= 1
print("Product of digit of your number is ", mul)
Output:
enter any number 12345
Product of digit of your number is 120
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