26 lines
532 B
Java
26 lines
532 B
Java
|
package Maths;
|
||
|
|
|
||
|
|
public class Factorial {
|
||
|
|
public static void main(String[] args) {
|
||
|
|
int n = 5;
|
||
|
|
System.out.println(n + "! = " + factorial(n));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Calculate factorial
|
||
|
|
*
|
||
|
|
* @param n the number
|
||
|
|
* @return the factorial of {@code n}
|
||
|
|
*/
|
||
|
|
public static long factorial(int n) {
|
||
|
|
if (n < 0) {
|
||
|
|
throw new ArithmeticException("n < 0");
|
||
|
|
}
|
||
|
|
long fac = 1;
|
||
|
|
for (int i = 1; i <= n; ++i) {
|
||
|
|
fac *= i;
|
||
|
|
}
|
||
|
|
return fac;
|
||
|
|
}
|
||
|
|
}
|