#include<stdio.h>main(){ int i=2,n=10; float fac=1; ? ?while(i<=n) { fac=fac*i; i++; } printf("factorial of %d is:%.2f.\n",n,fac); }這是求10的階乘，，，while??改為???if??怎么不行？？？ 求教，謝謝