Java program for factorial incorrect output

I execute the following java code in the eclipse ide

public class Programs {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int i,num,n;
        n = 6;
        // num=n-1;
        for (i = 1; i <= n - 1; i++) {
            n = n * i;
        }
        System.out.println("Factorial of the declared number is" + " " + n);
    }

}

It displays the output as - 1420957696 If I uncomment and use the "num" variable in the for loop, the code works properly I think for each iteration, the value of N changes gradually compared with the value of I The same code works in VBScript (see below) Can anyone explain the difference?

Option Explicit
Dim  i,num
num = Input@R_676_2419@("enter a number")
For i=1 To num-1
    num = num * i
Next
Msg@R_676_2419@ "The factorial of entered number is: " & num,3,"Program for factorial"

Solution

Java:

N will become quite large I

Therefore, I < = n - 1 will always be true until your n overflows and winds back to a negative number One solution is to use num to save the original value of N and use I < = num - 1 as the stop condition In VBScript: in various basic knowledge (such as VBScript, VBA), num-1 is effectively calculated at the beginning of the cycle, and further adjustment of num has no effect on the stop condition You can see this clearly by running

Dim j
Dim i

j = 10
For i = 1 To j
    WScript.Echo i
    j = 1 'has no effect on the stopping condition.
Next