ISBN Project

hello all!! :) i need some help on a project im doing for school!!
its needs to vadilated a ISBN number which is on a back of a book
(ISBN 0-471-14242-5) the project has to take the - out and then check to see if its a digit/// then do some maths on it to check the vadilate......

hope some one can help cheers people

Ok... so let's see what part you need help with?

I guess you know the algorithm of calculating the ISBN number? Then it shouldn't be too hard to write a program to verify if a given ISBN number is valid. Give it a try and post your code if you have problems with it.