用递归法求n的阶乘

递归求阶乘

#include<stdio.h>

int fac(int n)

{

int f;

if(n<0 || n>12)

printf("data error!");

else if(n==0||n==1)

f=1;

else

f=fac(n-1)*n;

return(f);

}

int main()

{

int n;

int y;

printf("来一个正整数:");

scanf("%d",&n);

y=fac(n);

printf("%d!=%d\n",n,y);

return 0;

}