Question

Debug the program so it prints the factorial of a positive integer entered by the user. This is calculated by multiplying all the numbers from 1 up to that number together. For example, 5 factorial is 5*4*3*2*1 = 120.
import java.util.Scanner;

public class U4_L1_5_Activity_Two{
public static void main(String[] args){

Scanner scan = new Scanner(System.in);
int num = scan.nextInt();
while(num >= 0){
int prod = 1;

prod = prod*num;
System.out.print(prod);
num--;
}


}
}

Answer 1

Your main problem was declaring int prod in the while loop. This caused prod to be reset back to 1 every time the while loop ran.