题解 | #数的阶乘#

疑问 为啥我这样写就不对 他说我编译错误

#define ll long long int
ll a,sum=1;
ll digui(ll x)
{
    if(x==a+1)
      return sum;
    sum=sum*x;
    digui(x+1);
}
int main ()
{
    scanf("%lld",&a);
 
    printf("%lld",digui(1));
}

然后我加了个return 在递归里

#define ll long long int
ll a,sum=1;
ll digui(ll x)
{
    if(x==a+1)
      return sum;
    sum=sum*x;
   return digui(x+1);
}
int main ()
{
    scanf("%lld",&a);
    printf("%lld",digui(1));
}

然后就对了