#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
    float x=4548.546f;
    double a=9.123456789;
    long double aa=999.12345678l;
    cout<<setprecision(6);
    cout<<"double a:"<<a<<endl;
    cout<<"long double a:"<<aa<<endl;
    cout<<"float x:"<<x<<endl;
    return 0;
}