This will be the terminating condition of the recursive method. Check if the value of the argument is one, then return one from this method. Create a method which accepts one argument. A recursive method should have a condition which must cause it to return else it will keep on calling itself infinitely resulting in memory overflow.Ĭalculating the factorial of a number using the recursive method should work on the following algorithm. A method which calls itself is called a recursive method. Recursion means a method calling itself until some condition is met. Read more: What is Null in Python Finding factorial of a number in Python using Recursion We are printing the factorial value when it ends.
This loop will exit when the value of ‘ n‘ will be ‘ 0‘.
On each iteration of the loop, we are decreasing the value of ‘n‘ by ‘ one‘. The while loop will run until the value of ‘n’ is greater than ‘one’. Similar to the above program, the variable ‘ fact‘ is used to hold the final factorial value. ‘ factorialUsingWhileLoop‘ method is used to find out the factorial using a while loop. The only difference is that we are using one ‘ while‘ loop instead of a ‘ for loop‘. The math library which ships with Python has a factorial() method that returns the factorial of the provided number.Similar to the above program, we can use one ‘ while‘ loop to find out the factorial.
Print("Factorial of ".format(num, fact)) Output Enter the Number :5 Print("Factorial of negative number is not defined") Program num = int(input("Enter the Number :")) Problem DefinitionĬreate a Python Program to find the factorial of the user-provided number. If n is an integer greater than or equal to 1, then factorial of n is, (n!) = 1*2*3*4.*nĪlso, the factorial value of 0 is equal to 1 and the factorial values for negative integers are not defined. Mathematically, the formula for the factorial is as follows. The factorial of a number is the product of all the integers from 1 to that number.
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