what am i missing?

Question

{
int x;
{cin << x << endl;}
if(x<10)
{cout << idiot << endl;}
else(x>10)
{cout << smart! << endl;} }

Answer 1

// Few of your syntax are wrongly allocated.
// Please refer to the code below.

#include <iostream>
using namespace std;

int main()
{
int x;

cout << "Please input an integer" << endl;
cin >> x;

if (x < 10)
{
cout << "Baka!" << endl;
}
else
{
cout << "Sugoii!" << endl;
}

return 0;
}

Answer 2

cin use >>

dont endl on cin.

use quotes with strings and cout. cout << "strings need quotes"

you dont need braces on cin line

Answer 3

cin << x << endl; doesnt need to be between {} and dont need to put endl after cin and for cin is >> u can try
int x;
cin >> x;
if (x < 10) {
cout << "idiot" << endl; //quotes cause idiot isnt a variable
}
else { //u dont have to put nothing after else just else { (code to be executed) }
cout << "smart!" << endl;
}
so if x < 10 print idiot otherwise print smart