Java/Maths/Factorial.java at master · null-exception/Java · GitHub

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package Maths;

//change around 'n' for different factorial results

public class Factorial {

public static void main(String[] args) {

int n = 5;

System.out.println(n + "! = " + factorial(n));

}

//Factorial = n! = n1 * (n-1) * (n-2)*...1

/**

* Calculate factorial N

* @param n the number

* @return the factorial of {@code n}

public static long factorial(int n) {

if (n < 0) {

throw new ArithmeticException("n < 0"); //Dont work with less than 0

}

long fac = 1;

for (int i = 1; i <= n; ++i) {

fac *= i;

}

return fac; //Return factorial

}

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