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 <pre class="brush:php;toolbar:false">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 <pre class="brush:php;toolbar:false">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 <pre class="brush:php;toolbar:false">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 <pre class="brush:php;toolbar:false">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 <pre class="brush:php;toolbar:false">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 <pre class="brush:php;toolbar:false">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 digit="int(num[index])" if index even="even+digit" else: odd="odd+digit" return num='input("Enter' the number: print of> <pre class="brush:php;toolbar:false">Enter the number:12345 sum of even number: 9 sum of odd number: 6
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