Fibonacci sequence 求余数

#include <iostream>
using namespace std;
int f(int n);

int main()
{
    int n;
    cin>>n;
    double number = 1.0 * f(n);
    cout<<number<<endl;
    cout<< number / <<endl;
    double leftNum = number /  - (int)number / ;
    cout<<leftNum;

    return ;
}

int f(int n)
{
    if(n ==  || n == )
        return ();
    else
    {
        return f(n - ) + f(n - );
    }
}