Add fan with pie slice

fan2.c

+/**
+ * rotating fan
+ */
+#include <graphics.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+int kbhit()
+{
+    struct timeval tv;
+    fd_set fds;
+    tv.tv_sec = 0;
+    tv.tv_usec = 0;
+    FD_ZERO(&fds);
+    FD_SET(STDIN_FILENO, &fds); //STDIN_FILENO is 0
+    select(STDIN_FILENO+1, &fds, NULL, NULL, &tv);
+    return FD_ISSET(STDIN_FILENO, &fds);
+}
+
+int main()
+{
+
+    /* request autodetection */
+    int gdriver = DETECT, gmode, errorcode;
+
+    /* Local Variables */
+    int x, y;
+    int i;
+
+    initgraph(&gdriver, &gmode, "");
+
+    x = getmaxx() / 2;
+    y = getmaxy() / 2;
+    i = 0;
+    while (!kbhit()) {
+
+        pieslice(x, y, i, i+30, 100);
+
+        pieslice(x, y, i+120, i+150, 100);
+
+        pieslice(x, y, i+240, i+270, 100);
+
+        delay(15);
+        cleardevice();
+
+        i++;
+    }
+
+    /* clean up */
+    closegraph();
+    return 0;
+}
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