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package Maths;
public class Factorial {
/* Driver Code */
public static void main(String[] args) {
assert factorial(0) == 1;
assert factorial(1) == 1;
assert factorial(5) == 120;
assert factorial(10) == 3628800;
}
/**
* Calculate factorial N using iteration
*
* @param n the number
* @return the factorial of {@code n}
*/
public static long factorial(int n) {
if (n < 0) {
throw new IllegalArgumentException("number is negative");
}
long factorial = 1;
for (int i = 1; i