find factorial by lambda function in python by R4R Team

-Factorial of any number is multiplication of all 1,2,3,4,.... upto that number.

Example -

5!=1*2*3*4*5

4!=1*2*3*4

Lambda function-

-In Python, anonymous function means that a function is without a name. As we already know that def keyword is used to define the normal functions and the lambda keyword is used to create anonymous functions.

Syntax-

lambda argument:expression


program-

#lambda function which find factorial
fact=lambda x: 1 if x==0 else x*fact(x-1)

print("Enter number to find factorial")
n=int(input())
print("Factorial of ",n,"is",fact(n))
print()

print("Factorial of 6 is",fact(6))
print("Factorial of 7 is",fact(7))
print("Factorial of 8 is",fact(8))
print("Factorial of 4 is",fact(4))

output-

Enter number to find factorial
5
Factorial of 5 is 120
Factorial of 6 is 720
Factorial of 7 is 5040
Factorial of 8 is 40320
Factorial of 4 is 24

-In this program, we make a lambda function named as fact() which are fact=lambda x: 1 if x==0 else x*fact(x-1), here we pass a argument i.e number and it check by condition
1 if x==0 else x*fact(x-1) that means it return 1 when x become 0 and otherwise it called itself with lesser value.