输入一个正整数n，计算其阶乘n!。请选择相应位置的正确内容。#include int main(){int i,n,fact;printf("please input n(>=0):");scanf("%d",&n);fact=1;for([A请选择][B请选择]i++)[C请选择]printf("%d!=%d\n",n,fact);return 0;}