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Factorial.java
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31 lines (28 loc) · 819 Bytes
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package Maths;
import java.util.*; //for importing scanner
public class Factorial {
public static void main(String[] args) { //main method
int n = 1;
Scanner sc= new Scanner(System.in);
System.out.println("Enter Number");
n=sc.nextInt();
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
}
}