WM_TIMER probs (FPS Calculations)

im havin probs with this bit of code:

Code:

case WM_TIMER:
        {
            if (wParam == FPS_TIMER)
            {
                FPSCount = round(FPSCount * 1000/FPS_INTERVAL);
                SetWindowText(hWnd, (WND_TITLE + "     [" + IntToString(FPSCount) + " FPS]")); 
                FPSCount = 0;
                return 0;
            }
        }

my IntToString function looks like this:

Code:

std::string IntToString(int num) 
{
    std::ostringstream ITS;
    ITS << num;
    
    return(ITS.str());
}

FPSCount starts as a value of 0

FPS_TIMER has a valuue of 1
FPS_INTERVAL has a value of 1000

ive included the following:

Code:

#include <math.h>
#include <windows.h>

By the way i got these errors all in that function:

411 C:\Documents and Settings\Admin\Desktop\Programmin\Conversions\temp late1.5\Main.cpp expected primary-expression before '=' token

413 C:\Documents and Settings\Admin\Desktop\Programmin\Conversions\temp late1.5\Main.cpp expected primary-expression before '=' token

414 C:\Documents and Settings\Admin\Desktop\Programmin\Conversions\temp late1.5\Main.cpp expected primary-expression before '=' token

414 C:\Documents and Settings\Admin\Desktop\Programmin\Conversions\temp late1.5\Main.cpp invalid operands of types `const char[43]' and `const char[7]' to binary `operator+' << this has to do with SetWindowText()

all the other ones have to with all the =' signs

Thanks!