[SOLVED] I don't understand why the output is 40320

Question

》https://code.sololearn.com/WqhdZt3MFKV4

Answer 1

factorial(8)
=> 8 == 0 false, goes to else block
=> factorial(8-1)*8

where factorial(7) = factorial(6)*7
...

until factorial(0) returns 1

so
factorial(8) = 1*1*2*3...*7*8

Answer 2

You are welcome.

This is called recursion. You need a ending condition to escape from infinite loop.

Try coding a Fibonacci with recursion as exercise.

Answer 3

Thanks a lot Mr. Gordon

Answer 4

What is the purpose of using these kinds of function?