First of all the `@` means we are dealing with a an inexact ‹inexact-complexn› ::= ‹inexact-realn› @ ‹inexact-realn› Here is a short guide: #e means

First of all the `@` means we are dealing with a an inexact ‹inexact-complexn› ::= ‹inexact-realn› @ ‹inexact-realn› Here is a short guide: #e means exact #x means hexadecimal So `#e#x+e` means exact 14. The last `#` in means an unknown number - Racket has chosen to use 0. Therefore `#e#x+e#` means 1416 = 224. The `s0` is an exponent mark, which marks the precision of an inexact number. The `s0` means single-precision (in Scheme s means short - in many implementations short and single both use single precision). Thus `#x+e#s0` means `224.0f` and `#e#x+e#s0` means 224. Now since it is a hexadecimal number the following `+e` means 14. Therefore `#e#x+e#s0+e` means `22416^14` which is 16140901064495857664. Now we come the `@`. This means the first part was the real part of a complex number and what follows is the imaginary part.