java-阶乘
import java.util.Scanner;
public class 阶乘 {
public static void main(String[] agrs) {
//阶乘
int n = 1, sum = 1;
Scanner a = new Scanner(System.in);
int s = a.nextInt();
for (n = 1; n <= s && s > 0; n++)
sum *= n;
while (s > 0 && n <= s) {
sum *= n;
n++;
}
System.out.println(sum);
}
}