Mouse events not working as they should in functions - c++

Question

I am displaying a card stack and need to know the exact pinpoints of the pixels so I mapped out a function that should return whatever LMB location was at pressed time. The issue with this is that for some reason I can no longer see the cards.
I tried making the function a class member of Game, but then the mouse logic doesn't work at all. I still had MyMouse M; declared but its like the code was just ignored completely. I know how to overload functions and yet this just seems to defy logic.
Function for MouseLogic();
void MouseLogic() {
Game G;
Coordinates C;
MyMouse M;
G.PrintLL(10, 25, G.start_user);
G.PrintLL(10, 10, G.start_cpu);
while (1) {
M.ReadMouseInput();
switch (M.InputRecord.EventType)
{
case MOUSE_EVENT: // mouse input
if (M.InputRecord.Event.MouseEvent.dwButtonState == FROM_LEFT_1ST_BUTTON_PRESSED)
{
int x = M.InputRecord.Event.MouseEvent.dwMousePosition.X;
int y = M.InputRecord.Event.MouseEvent.dwMousePosition.Y;
cout << GetCardNumber(x, y);
}
}
}
}
Function for GetCardNumber
int GetCardNumber(int x, int y)
{
if ((x >= 10 && x <= 23) && (y >= 10 && y <= 25))
return 1;
else if ((x >= 41 && x <= 54) && (y >= 10 && y <= 25))
return 2;
else if ((x >= 72 && x <= 85) && (y >= 10 && y <= 25))
return 3;
else if ((x >= 45 && x <= 60) && (y >= 10 && y <= 25))
return 4;
else if ((x >= 78 && x <= 91) && (y >= 10 && y <= 25))
return 5;
else if ((x >= 10 && x <= 23) && (y >= 25 && y <= 40))
return 6;
else if ((x >= 41 && x <= 54) && (y >= 25 && y <= 40))
return 7;
else if ((x >= 72 && x <= 85) && (y >= 25 && y <= 40))
return 8;
else if ((x >= 45 && x <= 60) && (y >= 25 && y <= 40))
return 9;
else if ((x >= 78 && x <= 91) && (y >= 25 && y <= 40))
return 10;
else
return 0;
}

Answer 1

This seemed to work for anyone wondering! I just had to pass the class as an argument for some reason. Would still love an explanation for the logic behind this.
void MouseLogic(Game G) {
Coordinates C;
MyMouse M;
G.PrintLL(10, 25, G.start_user);
G.PrintLL(10, 10, G.start_cpu);
while (1) {
M.ReadMouseInput();
switch (M.InputRecord.EventType)
{
case MOUSE_EVENT: // mouse input
if (M.InputRecord.Event.MouseEvent.dwButtonState == FROM_LEFT_1ST_BUTTON_PRESSED)
{
int x = M.InputRecord.Event.MouseEvent.dwMousePosition.X;
int y = M.InputRecord.Event.MouseEvent.dwMousePosition.Y;
cout << GetCardNumber(x, y);
}
}
}
}