偷偷告诉你......

     #include            <iostream>
using
        namespace
std     ;
            int
    main(
    )
        {
    cout
        <<
                    "Hello,world!"<<
                
            endl
        ;
    return
0
    ;
}

==

#include <iostream>
using namespace std;
int main()
{
   cout<<"Hello,world!"<<endl;
   return 0;
}