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This article is created to cover some programs in Python, to find and print factors of a number entered by user at run-time. Here are the list of approaches used:

- Find Factors of a Number using
**while**Loop - Using
**for**Loop - Using Function

**Note - **Factors of a number say **n** are numbers that divides the number (n) exactly. For example, factors
of **12** are **1, 2, 3, 4, 6, 12**. All these six numbers divides **12** without leaving any remainder.

To find factors of any number in Python, you have to ask from user to enter a number, then find and print its factors as shown in the
program given below. The question is, **write a Python program to find factors of a number using while loop**. Here is its answer:

print("Enter the Number: ") num = input() num = int(num) print("\nFactors of", num) i = 1 while i<=num: if num%i==0: print(i) i = i+1

Here is the initial output produced by this Python program:

Now supply the input say **12** and press `ENTER`

key to find and print all factors of **12** as
shown in the snapshot given below:

The dry run of above program with user input **12**, goes like:

- Initial value,
**num = "12"**(entered by user). In Python, anything received using**input()**treated as a string type value. Therefore using the following statement:

`num = int(num)`

the value of**num**gets converted into an integer type value. So**num=12**, and**i=1** - Now the condition (of
**while loop**)**i<=num**or**1<=12**evaluates to be true, therefore program flow goes inside the loop - Inside the loop, the condition (of
**if**)**num%i==0**or**12%1==0**or**0==0**evaluates to be true, therefore program flow goes inside this**if**'s body and the value of**i**gets printed as a factor of given number - Now the value of
**i**gets incremented by 1. So**i=2**now - Again the condition of
**while**loop gets evaluated. That is the condition**i<=num**or**2<=12**evaluates to be true again, therefore program flow again goes inside the loop - Inside the loop, the condition (of
**if**)**num%i==0**or**12%2==0**or**0==0**again evaluates to be true, therefore program flow again goes inside its body and the value of**i**gets printed as another factor of**12** - The value of
**i**gets incremented. So**i=3**. Now the condition of**while**loop again gets evaluated. This time also the condition evaluates to be true, therefore program flow goes inside the loop - This process continues until the condition evaluates to be false
- In this way, all factors of
**12**(given number by user) gets printed, one by one

This is the modified version of previous program. This program uses **end** to skip inserting an automatic newline using
**print()**. The **str()** is used to convert value to a string type. The **try-except** is used to handle invalid input.

print("Enter a Number: ", end="") try: num = int(input()) print("\nFactors of " +str(num)+ " are: ", end="") i = 1 while i<=num: if num % i == 0: print(i, end=" ") i = i + 1 print() except ValueError: print("\nInvalid Input!")

Here is its sample run with user input **42**:

Here is another sample run with an invalid user input say **23.4**:

This program does the same job as of previous program, but this program is created using **for** loop, instead of **while**.
Let's have a look at the program first:

print("Enter a Number: ", end="") try: num = int(input()) print("\nFactors of " +str(num)+ " are: ", end="") for i in range(1, num+1): if num % i == 0: print(i, end=" ") print() except ValueError: print("\nInvalid Input!")

In above program, the following code:

for i in range(1, num+1):

states that the statement inside it, gets executed **num** number of times with value of **i** from 1 to
**num**. For example, if the value of **num** is 12, then the loop gets evaluated 12 times with value of **i** from 1 to 12.

This program is created using a user-defined function named **FindFact()**. This function receives the number
entered by user as its argument and prints all its factors from inside this function.

def FindFact(n): for i in range(1, n+1): if n % i == 0: print(i, end=" ") print() print("Enter a Number: ", end="") try: num = int(input()) print("\nFactors of " +str(num)+ " are: ", end="") FindFact(num) except ValueError: print("\nInvalid Input!")

This program produces exactly same output as of previous program.

This is the last program, created using **class**, an object-oriented feature of Python.

class CodesCracker: def FindFact(self, n): for i in range(1, n+1): if n % i == 0: print(i, end=" ") print("Enter a Number: ", end="") try: num = int(input()) print("\nFactors of " +str(num)+ " are: ", end="") ob = CodesCracker() ob.FindFact(num) print() except ValueError: print("\nInvalid Input!")

To access member function named **FindFact()** of a class named **CodesCracker**, an object of this class
is required. Therefore an object **ob** is created of class **CodesCracker**, and using **. (dot)** operator,
I've accessed the member function of the class as shown in the program given above.

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