void drawCircle(int x, int y, int r);
void fillCircle(int x, int y, int r);
+ void drawText(int x, int y, const char *text);
+
bool sync(unsigned long time = ULONG_MAX);
+ void closeGraph();
+
void sleep(unsigned long secs);
void msleep(unsigned long msecs);
void usleep(unsigned long usecs);