In mathematics , the factorial of a non-negative integer n , denoted by n !, is the product of all positive integers less than or equal to n . For example, The value of 0! is 1, according to the convention for an empty product import java.util.Scanner; public class Factorial { public static void main(String[] args) { int num ,fact=1; System.out.println("enter number:"); Scanner sc=new Scanner(System.in); num=sc.nextInt(); if(num<0){ System.out.println("only positive number !"); } else{ for(int i=1;i<=num;i++) { fact=fact*i; } System.out.println("the factorial of "+num + " is " +fact); } } } Output: ======= enter number: 3 the factorial of 3 is 6
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