**Factorials**are very simple things. They're just products, indicated by an exclamation mark. For instance, "four

**factorial**" is written as "4!" and means 1×2×3×4 = 24. In general, n! ("enn

**factorial**") means the product of all the whole numbers from 1 to n; that is, n! = 1×2×3×...×n.

The idea of calling one function from another immediately suggests the possibility of a function calling

*itself*. The function-call mechanism in Java supports this possibility, which is known as

*recursion*.

public static int factorial(int N) { if (N == 1) return 1;

else return N * factorial(N-1); }

public class FactorialRecursion {

public static void main(String[] args) {

int n=5;

System.out.println(fact(n));

}

public static int fact(int n)

{

if(n<=1)

return 1;

else

return n*fact(n-1);

}

}

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