Python programs to find factorial of number example; In this tutorial, you will learn how to find factorial of given number or user-inputted number in python using while loop, for loop and recursion fuction.

Factorial, in mathematics, **the product of all positive integers less than or equal to a given positive integer and denoted by that integer and an exclamation point**. Thus, factorial seven is written 7!, meaning 1 × 2 × 3 × 4 × 5 × 6 × 7. Factorial zero is defined as equal to 1.

## Find the Factorial of a Number in Python

There are 3 ways to find the factorial of number in python; as shown below:

- Python Program find factorial using using While Loop
- Factorial of a number in python using for loop
- Factorial of a number in python using recursion

### Python Program find factorial using using While Loop

Follow the below steps and write a python program to find factorial of a number using while loop

- Take input from the user
- Define fact variable
- Iterate while loop and find factorial of given number and store it
- Print
**factorial**

```
num = int(input("enter a number: "))
fact = 1
i = 1
while i <= num:
fact = fact * i
i = i + 1
print ("Factorial of the number %d is %d" %(num, fact))
```

**Output**

enter a number: 5 Factorial of the number 5 is 120

**Recommended:-**Python Random Number Generator Code

### Factorial of a number in python using for loop

Follow the below steps and write a python program to find factorial of a number using for loop

- Take input from the user
- Define fact variable
- Iterate for loop and calculate factorial of number
- Print
**the**final result

```
#Python program to print factorial of a number
num = int(input("Enter the number: "))
fact = 1
#iterating through the num value
for i in range (1, num+1):
fact = fact*i
#printing the output
print ("Factorial of the number %d is %d" %(num, fact))
```

**Output**

Enter the number: 10 Factorial of the number 10 is 3628800

### Factorial of a number in python using recursion

Follow the below steps and write a python program to find factorial of a number using recursion

- Define a function to calculate factorial of given number
- Take input from the user
- Use if else statement to check input number
- Call above define factorial function
- Print
**the**final result

```
# Factorial of a number using recursion
def recur_factorial(n):
if n == 1:
return n
else:
return n*recur_factorial(n-1)
num = int(input("Enter the number: "))
# check if the number is negative
if num < 0:
print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
print("The factorial of 0 is 1")
else:
print("The factorial of", num, "is", recur_factorial(num))
```

**Output**

Enter the number: 6 The factorial of 6 is 720

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