Hjælp Bertel eller andre

Kode 

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

void SetTimeOut(HANDLE Port, int MSec) 
{ 
COMMTIMEOUTS commtimeouts; 
GetCommTimeouts(Port, &commtimeouts); 
commtimeouts.ReadIntervalTimeout = MSec; 
commtimeouts.ReadTotalTimeoutMultiplier = 1; 
commtimeouts.ReadTotalTimeoutConstant = MSec; 
SetCommTimeouts(Port, &commtimeouts); 
} 
unsigned int Start, End; 

void Rx(HANDLE Port) 
{ 
char Buffer[128]; 
DWORD Length = 0; 
DWORD ErrorType = 0; 
do 
{ 
ReadFile(Port, Buffer, 128, &Length, 0); 
ClearCommError(Port, &ErrorType, 0); 

} 
while(Length == 0 && ErrorType == 0);

Start = clock(); 
cout << "Du har sat de to ledninger sammen 1 gang" <<endl;
} 

void Rx1(HANDLE Port) 
{ 
char Buffer[128]; 
DWORD Length = 0; 
DWORD ErrorType = 0; 
double diff; 
do 
{ 
ReadFile(Port, Buffer, 128, &Length, 0); 
ClearCommError(Port, &ErrorType, 0); 
End = clock(); 
diff = (double )(End - Start)/CLOCKS_PER_SEC; 
} 
while((Length == 0 && ErrorType == 0) || diff < 0.50); 
cout << "Delay: " << (double )(End - Start)/CLOCKS_PER_SEC << endl;
} 



int main(void) 
{ 
DCB dcb; 
HANDLE ComPort = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0); 

GetCommState(ComPort, &dcb); 
dcb.BaudRate = 9600; 
dcb.ByteSize = 8; 
dcb.fRtsControl = RTS_CONTROL_ENABLE; 
dcb.fErrorChar = TRUE; 
dcb.fParity = TRUE; 
dcb.Parity = ODDPARITY; 
dcb.fAbortOnError = TRUE; 
dcb.fOutxCtsFlow = 1; 
SetCommState(ComPort, &dcb); 
SetTimeOut(ComPort, 1); 

float hjul = 0.6908; //0.6908 meter
float ms;
float tidisek;

while(1)
{ 
Rx(ComPort); 
Rx1(ComPort); 
tidisek = End / 1000;
ms = hjul / tidisek;


cout << "Hjulet korer " << ms << " m/s" << endl;
Start = 0; 
End = 0;

} 

return 0; 
}