35 Important For loop Programs in Python (Solved) Class 11

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For loop Programs in Python

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

a. First 10 Even numbers

b. First 10 Odd numbers

c. First 10 Natural numbers

d. First 10 Whole numbers

Ans. 

a) 

for i in range(2, 22, 2):
    print(i)

b)

for i in range(1, 20, 2):
    print(i)

c)

for i in range(1, 11):
    print(i)

d)

for i in range(0, 10):
    print(i)

Q2. Write a program to print first 10 integers and their squares like

1 1

2 4

3 9 and so on

Ans. 

print("Numbers\t\tSquares")
for i in range(1, 11):
       print(i,"\t\t\t\t", i ** 2)

OUTPUT :

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

For loop Programs in Python

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

10, 20, 30 … … 300

Ans.

for i in range(10, 301, 10) :
     print(i, end = " , ")

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

105, 98, 91 ………7

Ans. 

for i in range(105, 6, -7) :
     print(i, end = " , ")

For loop Programs in Python

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

Ans.

for i in range(10, 0, -1) :
    print(i)

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

Ans. 

sum = 0
for i in range(1, 11, 1):
    sum = sum + i
print(sum)

For loop Programs in Python

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

Ans. 

sum = 0
for i in range(2, 22, 2):
     sum = sum + i
print(sum)

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

Ans. 

num = int(input("Enter any number"))
for i in range(1,11):
    print(num," * ", i," = ", num *i)

OUTPUT :

Enter any number7
 7  *  1  =  7
 7  *  2  =  14
 7  *  3  =  21
 7  *  4  =  28
 7  *  5  =  35
 7  *  6  =  42
 7  *  7  =  49
 7  *  8  =  56
 7  *  9  =  63
 7  *  10  =  70

For loop Programs in Python

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

Ans. 

num1 = int(input("Enter first number"))
num2 = int(input("Enter second number"))
if num1 > num2 :
   for i in range(num2+1 , num1):
      if i%2 == 0:
         print(i)
else :
   for i in range(num1 + 1, num2):
      if i % 2 == 0:
         print(i)

OUTPUT :

Enter first number34
Enter second number12
 14
 16
 18
 20
 22
 24
 26
 28
 30
 32

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

Ans. 

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

OUTPUT : 

Enter any number : 7
7 is prime number

For loop Programs in Python

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

Ans. 

num1 = int(input("Enter any number : "))
r=0
s=0
len = len(str(num1))
for i in range(len):
   r = num1 % 10
   s = s + r
   num1 = num1//10
print("Sum of the digits are : " , s)

OR

num = input("Enter any number : ")
f = 0
for i in num:
    f = f + int(i)
print("Sum of the digits is  : ", f)

OUTPUT : 

Enter any number  : 564
Sum of the digits are : 15

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

Ans. 

num = input("Enter any number : ")
f = 1
for i in num:
   f = f * int(i)
print("Product of the digits is  : ", f)

OUTPUT : 

Enter any number : 231
Product of the digits is  :  6

For loop Programs in Python

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

Ans. 

num1 = int(input("Enter any number : "))
r=0
rnum=0
len = len(str(num1))
for i in range(len):
   r = num1 % 10
   rnum = rnum * 10 + r
   num1 = num1//10
print("Reverse number is : ", rnum)

OR

num1 = input("Enter any number : ")
print("Reverse number is : ", num1[: : -1])


OUTPUT : 

Enter any number : 342
Reverse number is :  243

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

Ans. 

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

OUTPUT : 

Enter any number : 5467
Five Four Six Seven

For loop Programs in Python

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

Ans. 

def fib(n):
   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=" ")
     for i in range(2,n):
          nt = ft + st
          print(nt,end = " ")
          ft = st
          st = nt
nt = int(input("How many terms you want in Fibinacci Series"))
fib(nt)

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

Ans. 

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

OUTPUT :
Enter any number : 6
Factorial of a number is  :  720

For loop Programs 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.)

Ans. 

num1 = input("Enter any number : ")
p=0
for i in num1:
   p = p + int(i)**3
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 convert binary to decimal.

Ans. 

bin = input("Enter the number in binary : ")
 dec = 0
 for i in range(len(bin)):
   pow = len(bin) - (i + 1)
   dec += int(bin[i]) * (2**pow)
 print("Equivalent decimal number  : " ,dec)

OUTPUT : 

Enter the number in binary : 1111
Equivalent decimal number  :  15

For loop Programs in Python

Q19. Write a program to add first n terms of the following series using a for loop:

1/1! + 1/2! + 1/3! + …….. + 1/n!

Ans. 

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

OUTPUT : 

Enter a any number  : 3
Sum is      :   2.0

Q20. Write a program to check whether a number is palindrome or not.

Ans. 

num1 = input("Enter any number : ")
rnum = num1[: : -1]
if num1 == rnum:
   print("Number is Palindrome")
else:
     print("Number is not Palindrome")

OR

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

For loop Programs in Python

Q21. Write a python program to sum the sequence:
1 + 1/1! + 1/2! + 1/3! + …….. + 1/n!

Ans. 

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

Q22. Write a program to accept 10 numbers from the user and display it’s average.

Ans. 

s=0
for i in range(10):
   num = int(input("Enter number : "))
   s = s + num
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

For loop Programs in Python

Q23. Write a program to accept 10 numbers from the user and display the largest & smallest number number.

Ans. 

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

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
Largest number is :  10
Smallest number is :  1

Q24. 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)


Ans. 

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

OUTPUT:

Enter first number2
Enter second number7
Sum of even numbers is :  12
Sum of odd numbers is :  15

For loop Programs in Python

Q25. Write a program to display all the numbers which are divisible by 13 but not by 3 between 100 and 500.

Ans. 

for i in range(101, 500):
   if i % 13 == 0 and i % 3 != 0:
     print(i)

Q26. Write a program to print the following series till n terms.

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


Ans. 

n = int(input("Enter value of n  : "))
st = '2'
for i in range(n):
   print(st, end=" , ")
   st =st + '2'

OUTPUT :

Enter value of n  : 4
2 , 22 , 222 , 2222 ,

For loop Programs in Python

Q27. Write a program to print the following series till n terms.

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

Ans. 

n = int(input("Enter value of n : "))
for i in range(1, n+1):
   print(i**2, end = " , ")

OUTPUT : 

Enter value of n : 6
1 , 4 , 9 , 16 , 25 , 36 ,

Q28. 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!

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 : "))
for i in range(1, n):
   sum = sum + x**i/fac(i)
print(sum)

OUTPUT:

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

For loop Programs in Python

Q29. Write a program to find the sum of following series :

x + x²/2 + ……….xⁿ/n

Ans. 

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

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

Q30. Write a program to find the sum of following series

1 + 8 + 27 …………n terms

Ans.

n = int(input("Emter number of terms  : "))
s = 0
for i in range(1, n+1):
   s = s + i ** 3
print(s)

OUTPUT : 

Emter number of terms  : 4
100

For loop Programs in Python

Q31. Write a program to find the sum of following series:

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

Ans. 

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

OUTPUT : 

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

Q32. Write a program to find the sum of following series:

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

Ans. 

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

OUTPUT : 

Enter number of terms : 6
23

For loop Programs in Python

Q33. Write a Program to print all the characters in the string ‘COMPUTER’ using for loop.

Ans. 

str = "COMPUTER"
for i in str:
    print(i)

OUTPUT :

C
O
M
P
U
T
E
R

Q34. Write a program to print only odd numbers from the given list using for loop. L = [23, 45, 32, 25, 46, 33, 71, 90]

Ans. 

L = [23, 45, 32, 25, 46, 33, 71, 90]
for i in L :
   if i % 2 != 0 :
      print(i)

OUTPUT : 
23
45
25
33
71

For loop Programs in Python

Q35. Write a program to print all the factors of a number using for loop.

Ans. 

n = int(input("Enter any number"))
print("Factors are : ")
for i in range(1, n+1):
     if n % i == 0 :
         print(i)

OUTPUT : 

Enter any number9
Factors are : 
 1
 3
 9

For loop Programs in Python

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