how do you endl function it c++

Question

how do you use <<endl; function on integer,float and string variables?Because i tried using it and it just gave me an error.My code looks like this:

include<iostream>
using namespace std;

int main{
int mgeffe;
mgeffe = (97);
float ngft;
ngft = (46.776);
string io;
io = ("you");
cout<<mgeffe <<endl;
cout<<ngft <<endl;
cout<<io;
}

Answer 1

The problem is not in endl.

add the '#' in include.
# include <iostream>

add the '()' in main.
int main(){
...
}

also, you don't have to put your values in (). You can also declare variables and assign value to them in the same line.
int mgfe = 97;
float ngft = 46.776;
string io = "you";

Answer 2

you're missing parentheses in the main function declaration.
#include<iostream>
using namespace std;

int main() {
int mgeffe;
mgeffe = 97;
float ngft;
ngft = 46.776;
string io;
io = "hi";

cout << mgeffe << endl;
cout << ngft << endl;
cout << io;
return 0;
}