NGHICHDAO C++

#include <bits/stdc++.h>
using namespace std;

float a,nd;
int main()
{
    //freopen("nghichdao.inp","r",stdin);
    //freopen("nghichdao.out","w",stdout);
    cin>>a;
    if(a==0) 
        cout<<"khong co";
    if(a!=0)
    {
        nd = float(1)/a;
        cout<<fixed <<setprecision(4)<<nd;
    }
}