I'm working with VS 2010's C++. Been a VB guru for far too long and trying to transfer my skills to the C++ world. Anyway, with that said, I'm very familiar with classes, but finding it difficult to implement a simple class on C++. So heres what I got. I got a simple Vector class in a header file:

//Vector.h
#ifndef VECTOR_TEST
#define VECTOR_TEST

class Vector
{
public:
	float x,y;
}
#endif VECTOR_TEST

And when I tried declaring it, and displaying the result in a Messagebox, I got a lot of error messages. Most of which has nothing to do with me making an error in my code:

//Main.cpp
#include "Vector.h"
#include <stdio.h>
#include <Windows.h>

int main(void)
{	
	Vector* v = new Vector[2];
	v[0].x = 5;
	char Text[255];
	sprintf(Text,"%f", v[0].x);
	MessageBox(NULL, Text, "typedef", MB_OK);
	return 0;
}

And these are the errors I received:

1>------ Build started: Project: Header Test, Configuration: Debug Win32 ------
1>  Main.cpp
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\codeanalysis\sourceannotations.h(29): error C2628: 'Vector' followed by 'unsigned' is illegal (did you forget a ';'?)
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\codeanalysis\sourceannotations.h(29): error C2628: 'Vector' followed by 'int' is illegal (did you forget a ';'?)
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\codeanalysis\sourceannotations.h(29): error C2347: '__w64' : can not be used with type '__w64 Vector'
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\codeanalysis\sourceannotations.h(29): error C2371: 'size_t' : redefinition; different basic types
1>          c:\c++ self tutorial\header test\header test\predefined c++ types (compiler internal)(19) : see declaration of 'size_t'
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

These errors seem to be all based on sourceannotations.h. I never really included this header at all and have no idea why its even being brought up. I only got 2 measly files. Main.cpp and Vector.h. Now if I don't use the Vector.h header and simply just do this:

#include <stdio.h>
#include <windows.h>

Integer main(void)
{	
	charText[255];
	int Number = 5;
	sprintf(Text,"%i", Number);
	MessageBox(NULL, Text, "Message", MB_OK);
	return 0;
}

Then it works just fine, like its nothing. Could anyone help me get a simple class going from the Vector header and tell me whats wrong? Thanks in advance.

Remember to read the error messages -- often the first one already contains a hint, just as in your case:

(did you forget a ';'?)

On a side note, please do NOT do that:

// an array of vectors is a grid, not a vector, so let's call it "grid" -- good variable names are important!
Vector* grid = new Vector[2]; // NO! memory leak if you forget to delete[]

In general, if you're just beginning, you should avoid using "new" like fire -- it implies manual memory management and should only be used if you have specialized needs (and, as such, you're no longer a beginner). Before you even consider using "new", make sure you have read and understood the following: http://www.informit.com/articles/article.aspx?p=1944072

If you meant to use a fixed-size array of "Vector", use an std::array:

std::array<Vector, 2> grid;

http://en.cppreference.com/w/cpp/container/array

If you'd like to have a resizable array instead, there's an std::vector for this:

std::vector<Vector> grid(2);

http://en.cppreference.com/w/cpp/container/vector

To add an element (automatically resizing your grid), simply use the "emplace_back" member function (or, if you'd like to waste some CPU cycles and/or memory, there's always "push_back" doing unnecessary copies (or moves, if you're lucky) ;-]):

A simple example: http://ideone.com/sVw9CO

#include <vector>
#include <iostream>

class Vector
{
public:
  float x,y;
};

int main()
{    
  // uninitialized grid[0] and grid[1]
  std::vector<Vector> grid(2);
  
  // (5, 3) stored in grid[2]
  // element constructed directly in "grid"
  grid.emplace_back(Vector{5.f, 3.f}); 
  
  // output: 5,3
  std::cout << grid[2].x << "," << grid[2].y << '\n';
  return 0;
}

HTH! :-)

Wow guys thank you so much! Yea those semicolons are brutal sometimes. Thanks for the heads up. I didn't know classes needed to end in a semicolon. Sometimes I can feel like such a noob.

The vector class was actually gonna be used on vertices, but I never knew an array of vectors is called a grid. Its kind of an unusual name to call it that. But once the polygons are drawn, it does seem to look like a grid in the end doesn't it.

Wow guys thank you so much! Yea those semicolons are brutal sometimes. Thanks for the heads up. I didn't know classes needed to end in a semicolon. Sometimes I can feel like such a noob.

The reason for this is that class definitions can be on the same statement as a variable that uses the class type. For instance:

struct Example{int member1; int member2;} example, *example2 = &example;

It's a relic from C that's not so useful in C++, though it's not that useful in C either.