Can i restore i my iphone 4S (ios7) and still keep ios7?

Just outta curiosity if i were to restore my iphone 4S that is runing ios 7.1.2 will i be able to keep ios 7.1.2 or will it force me to update to ios 8? I do know when a person does a full restore of an Idevice it wipes everything including the OS in do so it reinstalls ios will apple force me to ios 8 or what?

More than likely you'd have to update to iOS 8

Nope. If you Reset/Restore an iOS 7 device, it will automatically update to iOS 8 after the Reset/Restore.