Recursive factorial

Write a function that returns @n@!!.

Solve this problem recursively.

Interface

C++ 
int factorial(int n);
C 
int factorial(int n);
Java 
public static int factorial(int n);
Python 
factorial(n)  # returns int
 
factorial(n: int) -> int

Precondition

Assume 0≤0\le @n@ ≤12\le 12.

Observation

You only need to submit the required procedure; your main program will be ignored.

Problem information

Author: Unknown
Translator: Carlos Molina

Generation: 2026-01-25T10:03:01.906Z

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