Does the fingerprint have a backup pin (iPhone 5s)?

Like, if the phone doesn't recognize your fingerprint, is there a backup option of installing a pin number or other password? I'm getting the 5s soon and I just wanna know if the fingerprint scanning is safe to use.

When you set up your fingerprint you also put a passcode incase it doesn't recognize your finger for some reason.

The key thing is use your thumbprint 4 times, some people are using 4 diff fingers which is stupid, use the same thumb 4 times when setting it up as its far more accurate that way.