Undefined function in DrScheme?

Question

Hey i'm just trying to write some code in DrScheme: ((function (x) (* x x)) 2)

but i got a message saying: reference to undefined identifier: function

I'm using language "Essentials of Programming languages (3rd ed.)" and the version of DrScheme is 4.2.1

Thanks!

Answer 1

umm... that is not Scheme. You probably want:

((lambda (x) (* x x)) 2)

Answer 2

should probably be

((lambda(x)(* x x))2)

or

((fun(x)(* x x))2)