//java写的
import java.util.Scanner;
public class KnownTest {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("输入一个数字");
int n = sc.nextInt();
System.out.println("结果是："+f(n));
}
public static int f(int n){
int sum = 1;
for(int i = 1;i <= n;++i){
sum *= i;
}
return sum;
}
}
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