#include <string>
using std::string;
using std::cout;
using std:: endl;
int main()
{
    string Hello("Hello");
    Hello += "world";
    cout <<Hello<< endl;
    if(Hello ==" Hello word");
}
cout<< equal<< endl;
{
return 0;
}

Line 12: error: expected constructor, destructor, or type conversion before '<<' token
compilation terminated due to -Wfatal-errors.