2-2.cpp

来自「为C++学习者」· C++ 代码 · 共 12 行

#include<iostream.h>
main()
{
  int n;
  unsigned long factor=1;
  cout<<"Enter a number :";
  cin>>n;
  for(int i=n;i>1;i--)
    factor=factor*i;
  cout<<n<<"!="<<factor<<endl;
  return 0;
}