I think in the context the OP is meaning Computer Science in the broader meaning, in either case I'd tell them to study something else, graduate employability for IT related degree's is terrible, they (the teaching profession/minister for education etc..) are always hammering on about the need for more computing students and how we are lagging behind (in the UK at least) but it's a complete falsehood (that's politician for lie), according to the BCS (British Computer Society) since 2000 IT related degree's have exceeded all other discipline's in terms of numbers of graduates, this means that the IT related degree is the 'default degree' (formerly it was Business Studies), as almost half of all degree's (ok.. 44%) are now IT related (as of 2010)
So the IT related studies degree has become the replacement of a ordinary or common garden business degree, why does that matter?...
well it hasn't worked well for most graduates as 22, 000 graduate positions available and 260k graduates per year (the average from 2000-2010) is not a good employment rate in fact only media studies and the "Arts and humanities" fare worst for employment. It's rather amusing to see that the default common garden business degree it replaces fares extremely well now and has over 90% employability for graduates.
so my advice to them - study something else.. anything else really :D