Hi, does somebody know what is wrong here? I tried using long, but program cannot calculate results for inputs bigger than 19.
package pl.codegym.task.task15.task1531;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;
/*
Silnia
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
int input = Integer.parseInt(reader.readLine());
reader.close();
System.out.println(factorial(input));
}
public static String factorial(int n) {
float silnia = n;
if (n == 0)
return "1";
if (n < 0)
return "0";
for (int i = 1; i < n; i++) {
silnia = silnia * i;
}
return String.valueOf(silnia);
}
}