# 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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