为啥错了

#include<iostream>
#include<cstdio>
using namespace std;
int main(){
    double n;
    cin>>n;
    printf("%f",n);
    cout<<endl;
    printf("%fl5",n);
    cout<<endl;
    printf("%e",n);
    cout<<endl;
    printf("%g",n);
    return 0;
}