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 :
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# Python 3 program to find # factorial of given number def factorial(n): # single line to find factorial return 1 if (n = = 1 or n = = 0 ) else n * factorial(n - 1 ); # Driver Code num = 5 ; print ( "Factorial of" ,num, "is" , factorial(num)) # This code is contributed by Smitha Dinesh Semwal |
Output:
Factorial of 5 is 120
2. Iterative:
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# Python 3 program to find # factorial of given number def 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 Code num = 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 number def factorial(n): # single line to find factorial return 1 if (n = = 1 or n = = 0 ) else n * factorial(n - 1 ) # Driver Code num = 5 print ( "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 number import math def factorial(n): return (math.factorial(n)) # Driver Code num = 5 print ( "Factorial of" , num, "is" , factorial(num)) # This code is contributed by Ashutosh Pandit |
Output:
Factorial of 5 is 120