40 Important Questions of While loop in Python (Solved) Class 11

Programs of while loop in Python

Q1. Write a program to print the following using while loop

a. First 10 Even numbers

b. First 10 Odd numbers

c. First 10 Natural numbers

d. First 10 Whole numbers

Show Answer
Ans. a)

num = 2
while(num<=20):
   print(num)
   num = num + 2

b)

num = 1
while(num<=20):
   print(num)
   num = num + 2

c)

num = 1
while(num<=10):
   print(num)
   num = num + 1

d)

num = 0
while(num<10):
   print(num)
   num = num + 1

Programs of while loop in Python

Q2. Write a program to print first 10 integers and their squares using while loop.

1 1

2 4

3 9 and so on

Show Answer
Ans. 

num = 1
print("Numbers\t\tSquares")
while(num<=10):
   print(num,"\t\t\t\t", num ** 2)
   num = num + 1


OUTPUT :

Numbers     Squares
 1                1
 2                4
 3                9
 4                16
 5                25
 6                36
 7                49
 8                64
 9                81
 10             100

Q3. Write for loop statement to print the following series:

10, 20, 30 … … 300

Show Answer
Ans. 

num = 10
while (num <= 300) :
    print(num, end = " , ")
    num = num +10

Q4. Write a while loop statement to print the following series

105, 98, 91 ………7.

Show Answer
Ans. 

num = 105
while(num >= 7) :
    print(num)
    num = num - 7

Q5. Write a program to print first 10 natural number in reverse order using while loop.

Show Answer
Ans. 

num = 10
while num >= 1:
     print(num)
     num= num - 1

Programs of while loop in Python

Q6. Write a program to print sum of first 10 Natural numbers.

Show Answer
Ans. 

num = 10
sum = 0
while num >= 1:
   sum = sum + num
   num= num - 1
print(sum)

Q7. Write a program to print sum of first 10 Even numbers.

Show Answer
Ans. 

num = 2
sum = 0
while num <= 20:
   sum = sum + num
   num= num + 2
print(sum)

Q8. Write a program to print table of a number entered from the user.

Show Answer
Ans. 

i = 1
num = int(input("Enter any number  : "))
while i <= 10:
    print(num," * ",i," = ", num * i)
    i = i+1

OUTPUT : 

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

Q9. Write a program to print all even numbers that falls between two numbers (exclusive both numbers) entered from the user using while loop.

Show Answer
Ans.

num1 = int(input("Enter first number  : "))
num2 = int(input("Enter second number  : "))
if num1 > num2:
   while(num1>num2):
     if num2 % 2 == 0:
       print(num2)
     num2 = num2 + 1
else:
   while(num1<num2):
     if num1 % 2 == 0:
       print(num1)
     num1 = num1 + 1

OUTPUT :

Enter first number  : 12
Enter second number  : 34
 12
 14
 16
 18
 20
 22
 24
 26
 28
 30
 32

Programs of while loop in Python

Q10. Write a program to check whether a number is prime or not using while loop.

Show Answer
Ans.

num1 = int(input("Enter any number : "))
k=0
if num1 == 0 or num1 == 1:
    print("Not a prime number ")
else:
   i = 2
   while(i<num1):
     if num1 % i == 0:
       k = k+1
     i = i+1
if k == 0 :
        print( num1,"is prime number")
else:
        print(num1, "is not prime number")

OUTPUT : 

Enter any number : 67
67 is prime number

Q11. Write a program to find the sum of the digits of a number accepted from the user.

Show Answer
Ans. 

num1 = int(input("Enter any number : "))
r=0
s=0
while(num1!=0):
    r = num1 % 10
    s = s + r
    num1 = num1//10
print("Sum of the digits are : " , s)

OUTPUT : 

Enter any number : 4567
Sum of the digits are :  22

Q12. Write a program to find the product of the digits of a number accepted from the user.

Show Answer
Ans. 

num1 = int(input("Enter any number : "))
 r=0
 p=1
 while(num1!=0):
     r = num1 % 10
     p = p * r
     num1 = num1//10
 print("Product of the digits are : " , p)

OUTPUT :

Enter any number : 342
Product of the digits are :  24

Programs of while loop in Python

Q13. Write a program to reverse the number accepted from user using while loop.

Show Answer
Ans. 

num1 = int(input("Enter any number : "))
r=0
rnum=0
while(num1!=0):
    r = num1 % 10
    rnum = rnum * 10 + r
    num1 = num1//10
print("Reverse number is : ", rnum)

OUTPUT :

Enter any number : 67023
Reverse number is :  32076

Q14. Write a program to display the number names of the digits of a number entered by user, for example if the number is 231 then output should be Two Three One

Show Answer
Ans.

num1 = input("Enter any number : ")
L1 = list(num1)
L = len(L1)
i=0
n = {0 : "Zero", 1 : "One", 2 : "Two", 3 : "Three", 4 : "Four", 5 : "Five", 6 : "Six", 7 : "Seven", 8 : "Eight", 9 : "Nine"}
while (i < L):
    print(n[int(L1[i])], end = " ")
    i = i + 1

OUTPUT : 

Enter any number : 937
Nine Three Seven

Programs of while loop in Python

Q15. Write a program to print the Fibonacci series till n terms (Accept n from user) using while loop.

Show Answer
Ans. 

n = int(input("How many terms you want in Fibonacci Series  : "))
if n==1:
      print("1")
elif n == 2:
      print("1, 1")
elif n <= 0:
      print("Please enter positive number greater than 0")
else:
      ft = 1
      st = 1
      print(ft,end=" ")
      print(st,end=" ")
      i = 2
      while(i<n):
           nt = ft + st
           print(nt,end = " ")
           ft = st
           st = nt
           i = i + 1

OUTPUT : 

How many terms you want in Fibonacci Series  : 7
1 1 2 3 5 8 13

Q16. Write a program to print the factorial of a number accepted from user.

Show Answer
Ans. 

num = int(input("Enter any number : "))
f = 1
i = 1
while(i <= num):
    f = f * i
    i = i + 1
print("Factorial of a number is  : ", f)

OUTPUT : 
Enter any number : 4
Factorial of a number is  :  24

Programs of while loop in Python

Q17. Write a program to check whether a number is Armstrong or not. (Armstrong number is a number that is equal to the sum of cubes of its digits for example : 153 = 1^3 + 5^3 + 3^3.)

Show Answer
Ans. 

num1 = input("Enter any number : ")
p=0
L = len(num1)
L1 = list(num1)
i = 0
while(i < L):
   p = p + int(L1[i])**3
   i = i + 1
if int(num1) == p:
    print("Number is Armstrong")
else:
   print("Number is not Armstrong")

OUTPUT : 
Enter any number : 153
Number is Armstrong

Q18. Write a program to add first n terms of the following series using a for loop:

1/1! + 1/2! + 1/3! + …….. + 1/n!

Show Answer
Ans. 

num = int(input("Enter any number  : "))
sum = 0
fact = 1
i = 1
while(i < num):
      fact= fact*i
      sum= sum + i/fact
      i = i + 1
print("Sum is       :    ",round(sum, 2))


OUTPUT : 

Enter any number  : 3
Sum is       :     2.0

Programs of while loop in Python

Q19. Write a program to enter the numbers till the user wants and at the end it should display the sum of all the numbers entered.

Show Answer
Ans. 

ch = 'Y'
sum = 0
while ch.upper() == 'Y':
     num = int(input("Enter any number  : "))
     sum = sum + num
     ch=input("Do you wish to continue(Y,N)?: ")    
print("Sum of all the numbers is  : ", sum)

OUTPUT : 

Enter any number  : 1
Do you wish to continue(Y,N)?: y
Enter any number  : 2
Do you wish to continue(Y,N)?: y
Enter any number  : 3
Do you wish to continue(Y,N)?: n
Sum of all the numbers is  :  6

Q20. Write a program to enter the numbers till the user enter ZERO and at the end it should display the count of positive and negative numbers entered.

Show Answer
Ans. 

ch = 'Y'
sump = 0
sumn = 0
num=1
while (num!=0):
     num = int(input("Enter any number  : "))
     if num > 0 :
       sump = sump + num
     else:
       sumn = sumn + num
print("Sum of all the positive numbers is  : ", sump)
print("Sum of all the negative numbers is  : ", sumn)

OUTPUT : 

Enter any number  : 5
Enter any number  : -5
Enter any number  : 3
Enter any number  : -3
Enter any number  : 4
Enter any number  : -4
Enter any number  : 0
Sum of all the positive numbers is  :  12
Sum of all the negative numbers is  :  -12

Programs of while loop in Python

Q21. Write a program to find the HCF of two numbers entered from the user.

Show Answer
Ans. 

num1 = int(input("Enter first number : "))
num2 = int(input("Enter second number : "))
rem = 1
if num1 > num2 :
   while rem!=0:
     rem = num1 % num2
     if rem == 0:
         hcf = num2
     else:
         num1 = num2
         num2 = rem
else :
   while rem!=0:
     rem = num2 % num1
     if rem == 0:
         hcf = num1
     else:
         num2 = num1
         num1 = rem
print("HCF of two numbers is  : ", hcf)

OUTPUT : 

Enter first number: 2
Enter second number: 8
HCF is 2

Q22. Write a program to convert Decimal to Binary.

Show Answer
Ans. 

num = int(input("Enter a positive number: ")) 
bin = 0 
p = 1 
n = num
while n>0:     
     rem = int(n % 2)     
     bin = bin + rem * p
     p = p*10     
     n = n/2 
print("Binary number of",num,"is",bin)

OUTPUT : 

Enter a positive number: 15
Binary number of 15 is 1111

Programs of while loop in Python

Q23. Write a program to convert Binary to Decimal.

Show Answer
Ans. 

bin = input("Enter a binary number: ")
dec=0
p=0
for i in reversed(bin):
     dec = dec + int(i)*pow(2,p)
     p=p+1
print("Decimal number of binary",bin," number is : ",dec)

OUTPUT :

Enter a binary number: 1111
Decimal number of binary 1111 number is : 15

Q24. Write a program to check whether a number is palindrome or not.

Show Answer
Ans. 

num1 = int(input("Enter any number : "))
onum = num1
r=0
rnum=0
len = len(str(num1))
i = 0
while(i<len):
     r = num1 % 10
     rnum = rnum * 10 + r
     num1 = num1//10
     i = i + 1
if onum == rnum:
    print("Number is Palindrome")
else:
    print("Number is not Palindrome")

OUTPUT :

Enter any number : 1234321
Number is Palindrome

Programs of while loop in Python

Q25. Write a python program  to sum the sequence:
1 + 1/1! + 1/2! + 1/3! + …….. + 1/n!

Show Answer
Ans. 

n = int(input("enter a nth term = "))
f = 1
s = 1
i=1
while(i<=n):
      f = f * i
      s = s + 1 / f
      i=i+1
print("sum of sequence = ", s)

OUTPUT :

enter a nth term = 5
sum of sequence =  2.7166666666666663

Q26. Write a program to accept 10 numbers from the user and display it’s average

Show Answer
Ans. 

s=0
i=0
while(i<10):
    num = int(input("Enter number : "))
    s = s + num
    i = i + 1
print("Average is : ", s/10)

OUTPUT : 

Enter number : 1
Enter number : 2
Enter number : 3
Enter number : 4
Enter number : 5
Enter number : 6
Enter number : 7
Enter number : 8
Enter number : 9
Enter number : 10
Average is :  5.5

Programs of while loop in Python

Q27. Write a program to accept 10 numbers from the user and display the largest & smallest number number.

Show Answer
Ans. 

L = [ ]
i = 0
while(i<10):
    num = int(input("Enter number : "))
    L.append(num)
    i = i + 1
L.sort()
print("Largest number is : ", L[-1])
print("Smallest number is : ", L[0])

Enter number : 1
Enter number : 2
Enter number : 3
Enter number : 4
Enter number : 5
Enter number : 6
Enter number : 7
Enter number : 8
Enter number : 9
Enter number : 99
Largest number is :  99
Smallest number is :  1

Q28. Write a program to display sum of odd numbers and even numbers separately that fall between two numbers accepted from the user.(including both numbers) using while loop.

Show Answer
Ans. 

num1 = int(input("Enter first number  : "))
num2 = int(input("Enter second number  : "))
se = 0
so = 0
if num1 > num2 :
     while(num2 <= num1):
        if num2%2 == 0:
          se = se + num2
          num2 = num2 + 1
        else:
          so = so + num2
          num2 = num2 + 1
else :
     while(num1 <= num2):
        if num1 % 2 == 0:
          se = se + num1
          num1 = num1 + 1
        else:
          so = so + num1
          num1 = num1 + 1
print("Sum of even numbers is : ", se)
print("Sum of odd numbers is : ", so)

OUTPUT:

Enter first number  : 16
Enter second number  : 12
Sum of even numbers is :  42
Sum of odd numbers is :  28

Programs of while loop in Python

Q29. Write a program to display all the numbers which are divisible by 13 but not by 3 between 100 and 500.(exclusive both numbers)

Show Answer
Ans. 

i = 101
while(i < 500):
    if i % 13 == 0 and i % 3 != 0:
      print(i)
    i = i + 1

OUTPUT : 
104
130
143
169
182
208
221
247
260
286
299
325
338
364
377
403
416
442
455
481
494

Q30. Write a program to print the following series till n terms.

2 , 22 , 222 , 2222 _ _ _ _ _ n terms

Show Answer
Ans. 

n = int(input("Enter value of n  : "))
st = '2'
i = 0
while(i<n):
    print(st, end=" , ")
    st =st + '2'
    i = i + 1

OUTPUT : 

Enter value of n  : 5
2 , 22 , 222 , 2222 , 22222 ,

Programs of while loop in Python

Q31. Write a program to print the following series till n terms.

1 4 9 16 25 _ _ _ _ _ n terms.

Show Answer
Ans. 

n = int(input("Enter value of n : "))
i = 1
while(i <= n):
    print(i**2, end = " , ")
    i = i + 1

OUTPUT : 

Enter value of n : 5
1 , 4 , 9 , 16 , 25 ,

Q32. Write a program to find the sum of the following series(accept values of x and n from user)

1 + x/1! + x²/2! + ……….xⁿ/n!

Show Answer
Ans. 

def fac(n):
    f = 1
    for i in range(1,n+1):
       f = f * i
    return(f)
sum = 1
n = int(input("Enter value of n : "))
x = int(input("Enter value of x : "))
i = 1
while(i < n):
    sum = sum + x**i/fac(i)
    i = i + 1
print(sum)

OUTPUT : 

Enter value of n : 5
Enter value of x : 3
16.375 

Q33. Write a program to find the sum of following series :

x + x²/2 + ……….xⁿ/n

Show Answer
Ans. 

n = int(input("enter a nth term = "))
x = int(input("Enter value of x : "))
sum = 0
i = 1
while(i<=n):
    sum = sum + 2**i/i
    i = i + 1
print(round(sum,2))

OUTPUT :

enter a nth term = 3
Enter value of x : 2
6.67

Programs of while loop in Python

Q34. Write a program to find the sum of following series

1 + 8 + 27 …………n terms

Show Answer
Ans. 

n = int(input("Enter number of terms : "))
s = 0
i = 1
while(i <= n):
   s = s + i ** 3
   i = i + 1
print(s)


OUTPUT:

Enter number of terms  : 4
100

Q35. Write a program to find the sum of following series:

1 + 2 + 6 + 24 + 120 . . . . . n terms

Show Answer
Ans. 

n = int(input("Enter number of terms  : "))
 s = 0
 pr = 1
 i = 1
 while(i<=n) :
    pr = i * pr
    print(pr, end = " + ")
    s = s + pr
    i = i + 1
 print(" = ", s)

OUTPUT : 

Enter number of terms  : 5
1 + 2 + 6 + 24 + 120 +  =  153

Programs of while loop in Python

Q36. Write a program to find the sum of following series:

S = 1 + 4 – 9 + 16 – 25 + 36 – … … n terms

Show Answer
Ans. 

n = int(input("Enter number of terms : "))
s = 0
sp = 1
sn = 0
i = 2
while(i <= n):
   if i % 2 == 0:
      sp = sp + i ** 2
      i = i + 1
   else :
      sn = sn + i ** 2
      i = i + 1
print(sp - sn)

OUTPUT : 

Enter number of terms : 6
23 

Programs of while loop in Python

Q37. Write a Program to print all the characters in the string ‘PYTHON’ using while loop.

Show Answer
Ans. 

str = "PYTHON"
i = 0
while(i<len(str)):
   print(str[i])
   i = i + 1

OUTPUT : 

P
Y
T
H
O
N

Programs of while loop in Python

Q38. Write a program to print only odd numbers from the given list using while loop. L = [23, 45, 32, 25, 46, 33, 71, 90]

Show Answer
Ans. 

L = [23, 45, 32, 25, 46, 33, 71, 90]
i = 0
while(i < len(L)) :
    if L[i] % 2 != 0 :
       print(L[i])
    i = i + 1

OUTPUT : 

23
45
25
33
71

Programs of while loop in Python

Q39. Write a program to print all the factors of a number using for loop.

Show Answer
Ans. 

n = int(input("Enter any number"))
print("Factors are : ")
i = 1
while(i <= n):
   if n % i == 0 :
     print(i)
   i = i + 1

OUTPUT : 

Enter any number8
Factors are : 
1
2
4
8

Programs of while loop in Python

Q40. Write a python program to get the following output

1—–49

2—–48

3—–47

. .

. .

. .

48—–2

49—–1

Show Answer
Ans. 

i=1
j=49
while(i<=49 and j>=1):
   print(i,"---",j)
   i=i+1
   j = j - 1

Programs of while loop in Python

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Programs of while loop in Python

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