1！+2！+3！+4 ！+ 6！……+N！的源代码 里面有很大数的阶乘的算法 煮要是按位算，那么大的数，肯定不能几个字节来存放 希望有用 -1!+2!+3!+4!+4!+!+6! ... ...+ N! Inside the source code of a great number of factorial algorithm cook if bitwise operator, then the large number and certainly does not want