MEMORYSTATUS memStatus;
GlobalMemoryStatus(&memStatus);
printf("memStatus.dwTotalPhys = %d (bytes)\n", memStatus.dwTotalPhys);
printf("memStatus.dwTotalPhys = %d (megabytes)\n", memStatus.dwTotalPhys/(1024*1024));
printf("memStatus.dwTotalPhys = %f (megabytes)", memStatus.dwTotalPhys/(double)(1024*1024));