Python Program for factorial of a number
Factorial of a non-negative integer, is multiplication of all integers smaller than or equal to n. For example factorial of 6 is 6*5*4*3*2*1 which is 720.
1.Recursive :
python3
# Python 3 program to find# factorial of given numberdef factorial(n): # single line to find factorial return 1 if (n==1 or n==0) else n * factorial(n - 1);# Driver Codenum = 5;print("Factorial of",num,"is",factorial(num))# This code is contributed by Smitha Dinesh Semwal |
Output:
Factorial of 5 is 120
2. Iterative:
python3
# Python 3 program to find # factorial of given numberdef factorial(n): if n < 0: return 0 elif n == 0 or n == 1: return 1 else: fact = 1 while(n > 1): fact *= n n -= 1 return fact# Driver Codenum = 5;print("Factorial of",num,"is",factorial(num))# This code is contributed by Dharmik Thakkar |
Output:
Factorial of 5 is 120
3. One line Solution (Using Ternary operator):
Python3
# Python 3 program to find# factorial of given numberdef factorial(n): # single line to find factorial return 1 if (n==1 or n==0) else n * factorial(n - 1)# Driver Codenum = 5print ("Factorial of",num,"is", factorial(num))# This code is contributed# by Smitha Dinesh Semwal. |
Output:
Factorial of 5 is 120
Please refer complete article on Program for factorial of a number for more details!
4. By using In-built function:
Python3
# Python 3 program to find# factorial of given numberimport mathdef factorial(n): return(math.factorial(n))# Driver Codenum = 5print("Factorial of", num, "is", factorial(num))# This code is contributed by Ashutosh Pandit |
Output:
Factorial of 5 is 120
