object appears under certain angles

i drew an object with a few faces. When i rotate the object around 360 deg, some faces disappear at certain angles but appear when viewed from front (0 deg). How to resolve this?

Push your farclipping plane further away.

what is the fast clipping plane and what code to do that?

It’s called far clipping plane. And if you don’t know what it is, then please go and read the redbook (also called the OpenGL-Manual). The near and the far clipping plane define at what z your geometry gets clipped. If a point lies outside of the clipping range, then it get’s clipped. You can set both via gluPerspective.