Vinayagam

Posted on Jun 4

Python Number Programs Using While Loop: Step-by-Step Guide

#python #codepractice #programming #ai

Introduction

Number-based problems are essential for improving programming logic. Using Python's while loop, we can solve different types of problems involving divisibility, counting, and special numbers.

This article demonstrates step-by-step solutions using simple logic and structured code.

Basic Practice

1. Print Numbers from 1 to 5

start = 1
while start <= 5:
    print(start, end=" ")
    start = start + 1

2. Print Odd Numbers from 1 to 10

start = 1
while start <= 10:
    if start % 2 != 0:
        print(start)
    start = start + 1

3. Print Multiples of 3 (Ascending)

start = 3
while start <= 15:
    if start % 3 == 0:
        print(start)
    start += 1

4. Print Multiples of 3 (Descending)

start = 15
while start >= 1:
    if start % 3 == 0:
        print(start)
    start = start - 1

5. Print Even Numbers (Descending)

start = 10
while start >= 2:
    if start % 2 == 0:
        print(start)
    start = start - 1

6. Print Odd Numbers (Descending)

start = 10
while start >= 1:
    if start % 2 != 0:
        print(start)
    start = start - 1

7. Divisibility Check for 3 and 5

start = 1
while start <= 50:
    if start % 3 == 0 and start % 5 == 0:
        print("divisible by both", start)
    elif start % 3 == 0:
        print("divisible by 3", start)
    elif start % 5 == 0:
        print("divisible by 5", start)
    start += 1

8. Divisible by 3 or 5

start = 1
while start <= 20:
    if start % 3 == 0 or start % 5 == 0:
        print(start)
    start += 1

9. Finding Divisors of a Number

num = 12
i = 1

while i <= num:
    if num % i == 0:
        print(i)
    i += 1

10. Count of Divisors

num = 12
i = 1
count = 0

while i <= num:
    if num % i == 0:
        count += 1
    i += 1

print("Total divisors:", count)

11. Prime Number Check

num = 7
i = 1
count = 0

while i <= num:
    if num % i == 0:
        count += 1
    i += 1

if count == 2:
    print("Prime Number")
else:
    print("Not a Prime Number")

12. Perfect Number Check

num = 6
i = 1
sum = 0

while i < num:
    if num % i == 0:
        sum += i
    i += 1

if sum == num:
    print("Perfect Number")
else:
    print("Not a Perfect Number")

Explanation

The while loop repeats execution until the condition becomes false
The % operator is used to check divisibility
Logical operators like and and or help combine conditions
Counters are used to track occurrences such as divisors

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