Factorial using Recursion in Java

Question

I am learning Java using the book Java: The Complete Reference. Currently I am working on the topic Recursion.

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Answer 1

The correct one is :

int factorial(int n)
{
    if(n==0||n==1)
        return 1;
    else 
        return n*factorial(n-1);
}

This would return 1 for factorial 0. Do it believe me . I have learned this the hard way. Just for not keeping the condition for 0 could not clear an interview.