C语言用递归法写爬楼梯一次可以爬一级可以爬两级N级的话有多少种爬楼方法

include<stdio.h>
void main()
{
unsigned long count(int n);
int n;
unsigned long m;
printf("请输入楼梯的阶数:");
scanf("%d",&n);
mcount(n);
printf("有%d种爬内楼梯的方法容&92;n",m);
}
unsigned long count (int n)
{
unsigned long f;
if(n1)
f1;
else
if(n2)
f2;
else
fcount(n-1)+count(n-2);
return(f);
}