Trouble with Vector?

Question

C++ / C#

Help a noob figure out what the problem is...

#include <iostream>
#include <string>
using namespace std;

int main()
{
  struct Vector {
    Vector v;
    float x, y, z;
    v.x=15, v.y=25, v.z=35;
    cout << v.x << endl;
  };
  
  system("pause");
  return 0;
}

In console:

1. 'v' has incomplete type 'main()::Vector'
   
2. 'v' does not name a type
   
3. 'cout' does not name a type
   

Answer 1

#include <iostream>
#include <string>
using namespace std;

struct Vector {
    float x, y, z;
  };
  
int main()
{
    Vector v;
    v.x=15, v.y=25, v.z=35;
    cout << v.x << endl;
    system("pause");
    return 0;
}

Compare.
Mistakes: you call output to the stream in a structure, declare an instance of your structure in the same structure.
Look, declare a structure (in your case, Vector), enter fields in it (in your case, x, y, z).
After that, in the function, you already declare an instance of your structure and fill in the fields you need.