将一个数进行阶乘结果会是一个很大的数，在c语言里double型也最大只能存一个两位数的整数的阶乘。本算法是对大数进行阶乘计算。-Factorial of a number of results will be carried out is a very large number of languages in the c-type double can only keep the largest of a double-digit integer number. This algorithm i