C / C++ / MFC

char c = 0;
while (c!=' ')
{
   if(kbhit())
   {
      c=getch();
      printf("*");
   }
}

while((c=_getch())!='\n')
{
      printf("*");
      s[i++]=c;
}
s[i]='\0';

string getPrompt(const char* szPrompt, bool bShow = true)
{
	cout << szPrompt << ": ";
 
	char szResponse[80];
 
	if (bShow)
		cin.getline(szResponse, sizeof(szResponse));
	else
	{
		#ifdef _WIN32
			int iPos = 0;
			for (int c = 0; (c = getch()) != '\r'; )
			{      
				if (c == '\b')
				{
					if (iPos > 0)
						iPos--;
				}
				else if (isprint(c) && iPos < sizeof(szResponse) - 1)
					szResponse[iPos++] = c;
			}
			szResponse[iPos] = 0;
		#else
			system("stty -echo");
			cin.getline(szResponse, sizeof(szResponse));
			system("stty echo");
		#endif
	}

	return szResponse;
}

void AMS_ProcessMessages()
{
	for (MSG msg; ::PeekMessage(&msg, NULL, 0, 0, PM_REMOVE); )
	{
		::TranslateMessage(&msg);
		::DispatchMessage(&msg);
	}
}