#include <windows.h>
#include <stdio.h>
DWORD Sum; /* data is shared by the thread(s) */

/* the thread runs in this separate function */
DWORD WINAPI Summation(LPVOID Param) {
   DWORD Upper = *(DWORD*)Param;
   for (DWORD i = 0; i <= Upper; i++)
     Sum += i;
   return 0;
}

int main(int argc, char *argv[]) {
	DWORD ThreadId;
	HANDLE ThreadHandle;
	int Param;
	/* perform some basic error checking */
	if (argc != 2) {
		fprintf(stderr,"An integer parameter is required\n");
		return -1;
	}

	Param = atoi(argv[1]);
	if (Param < 0) {
		fprintf(stderr,"An integer >= 0 is required\n");
		return -1;
	}
   // create the thread
   ThreadHandle = CreateThread(
		NULL, // default security attributes
		0, // default stack size
		Summation, // thread function
		&Param, // parameter to thread function
		0, // default creation flags
		&ThreadId); // returns the thread identifier
   if (ThreadHandle != NULL) {
	// now wait for the thread to finish WaitForSingleObject(ThreadHandle,INFINITE);
	// close the thread handle
	CloseHandle(ThreadHandle);
	printf("sum = %d\n",Sum);
   }
}