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/*=========================================Program Description ==========================*/ 
/*程序名称 :factorial.c                                                                    */ 
/*程序目的 :设计一个阶乘运算的程序                                       */ 
/*written by chen xiao yong .(chen studio)                                 */ 
/*=======================================================================================*/ 
 
# include  
/*---------------------------------------------------------*/ 
/*递归阶乘运算*/ 
/*---------------------------------------------------------*/ 
 
int Factor(int N) 
{ 
	if (N <= 1) return 1;            /*递归结束条件*/ 
	else return N*Factor(N-1);       /*递归执行部分*/ 
} 
 
/*-----------------------------------------------------------*/ 
/*主程序*/ 
/*-----------------------------------------------------------*/ 
void main() 
{ 
	int Number;        /*运算数值变量*/ 
	int Factorial;     /*运算阶乘变量*/ 
 
	printf("please enter a number\n"); 
	scanf("%d",&Number); 
 
	Factorial = Factor(Number); 
	printf("%d! = %d\n",Number,Factorial); 
 
}