Here are some while loop questions focused on numbers for practice:
Basic Problems
1.Print Numbers
Write a program to print numbers from 1 to 10 using a while loop.
def print_number(no):
num=1
while num<=no:
print(num, end=" ")
num+=1
print_number(10)
1 2 3 4 5 6 7 8 9 10
2.Sum of N Numbers
Write a program to calculate the sum of the first NN natural numbers using a while loop.
def sum_of_number(no):
num=1
total=0
while num<=no:
total=total+num
num+=1
return total
no=int(input("Sum of the number:"))
print(sum_of_number(no))
Sum of the number:10
55
3.Even Numbers
Write a program to print all even numbers between 1 and 50 using a while loop.
def print_even_number(no):
num=2
while num<=no:
print(num, end=" ")
num+=2
print_even_number(50)
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
4.Odd Numbers
Write a program to print all odd numbers between 1 and NN.
def print_odd_number(no):
num=1
while num<=no:
print(num, end=" ")
num+=2
return no
no=int(input("Enter the number:"))
print_odd_number(no)
Enter the number:20
1 3 5 7 9 11 13 15 17 19
5.Reverse Count
Write a program to print numbers from 20 to 1 in reverse order using a while loop.
def print_reverse_number(no):
num=20
while num>=no:
print(num, end=" ")
num-=1
print_reverse_number(1)
20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Intermediate Problems
1.Factorial Calculation
Write a program to calculate the factorial of a given number using a while loop.
def find_factorial(num):
no=1
factorial=1
while no<=num:
factorial=factorial*no
no+=1
return factorial
num=int(input("Enter the number:"))
print(find_factorial(num))
Enter the number:5
120
Sum of Digits
Write a program to find the sum of the digits of a given number (e.g., 123 → 1+2+3=6).
def sum_of_digits(num):
sum=0
while num>0:
sum=sum+num%10
num=num//10
return sum
num=int(input("Enter the number:"))
print(sum_of_digits(num))
Enter the number:123
6
3.Count Digits
Write a program to count the number of digits in a given number (e.g., 12345 → 5 digits).
def count_of_digits(num):
count=0
while num>0:
num=num//10
count+=1
return count
num=int(input("Enter the number:"))
print(count_of_digits(num))
Enter the number:12345
5
4.Reverse a Number
Write a program to reverse a given number (e.g., 123 → 321).
def reverse_number(num):
reverse=0
while num>0:
reverse=reverse*10+num%10
num=num//10
return reverse
num=int(input("Enter the number:"))
print(reverse_number(num))
Enter the number:123
321
5.Multiplication Table
Write a program to print the multiplication table of a given number nn using a while loop.
def multiply(num):
no=1
while no<=15:
print(no,"*",num,"=",no*num , end="\n")
no+=1
num=int(input("Enter the number:"))
multiply(num)
Enter the number:12
1 * 12 = 12
2 * 12 = 24
3 * 12 = 36
4 * 12 = 48
5 * 12 = 60
6 * 12 = 72
7 * 12 = 84
8 * 12 = 96
9 * 12 = 108
10 * 12 = 120
11 * 12 = 132
12 * 12 = 144
13 * 12 = 156
14 * 12 = 168
15 * 12 = 180
Advanced Problems
1.Check Palindrome
Write a program to check if a given number is a palindrome (e.g., 121 → palindrome, 123 → not a palindrome).
def palindrome(num):
count=0
while num>0:
count=count*10+num%10
num=num//10
return count
num=int(input("Enter the number:"))
result=palindrome(num)
if result==num:
print("Palindrome")
else:
print("Not palindrome")
Enter the number:121
Palindrome
Enter the number:123
Not palindrome
*2.Find the power *
def find_power(base,power):
result=1
while power>=1:
result=result*base
power-=1
return result
base=int(input("Enter the base number:"))
power=int(input("Enter the power number:"))
result=find_power(base,power)
print(result)
Enter the base number:2
Enter the power number:5
32
3.Armstrong Number
Write a program to check if a given number is an Armstrong number (e.g., 153 → 13+53+33=15313+53+33=153).
def count_of_digits(num):
count=0
while num>0:
num=num//10
count+=1
return count
def find_power(base,power):
result=1
while power>=1:
result=result*base
power-=1
return result
def find_armstrong(num,count):
armstrong=0
while num>0:
rem=num%10
result= find_power(rem,count)
armstrong=armstrong+result
num=num//10
return armstrong
num=int(input("Enter the number:"))
count=count_of_digits(num)
armstrong_result=find_armstrong(num,count)
if armstrong_result==num:
print("Armstrong")
else:
print("Not armstrong")
Enter the number:123
Not armstrong
Enter the number:153
Armstrong
4.Sum of even and odd position:
def sum_of_even_odd(num):
odd=0
even=0
index=0
while index<len(num):
digit=int(num[index])
if index%2==0:
even=even+digit
else:
odd=odd+digit
index+=1
return even,odd
num=input("Enter the number:")
even,odd=sum_of_even_odd(num)
print("sum of even number:",even)
print("sum of odd number:",odd)
Enter the number:12345
sum of even number: 9
sum of odd number: 6
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