#include<stdio.h>#include<stdlib.h>#include<time.h>int main(){ int num,i,result=1; scanf("%d",&num); for(i=1;i<=num;i++) { result=result*i; } printf("%d ",result);return 0;}/*
*///注意:在两个数做运算时,只要有一个是浮点数,计算的结果均为浮点数!