Cars, Assemble!

Numbers in Clojure include:

• Integers: numbers with no digits behind the decimal separator (whole numbers). Examples are -6, 0, 1, 25, 976 and 500000.
• Floating-point numbers: numbers with zero or more digits behind the decimal separator. Examples are -2.4, 0.1, 3.14, 16.984025 and 1024.0.

Two common numeric types are int and float. An int is a 32-bit integer and a float is a 64-bit floating-point number.

Arithmetic is done using the standard arithmetic operators. Numbers can be compared using the standard numeric comparison operators (>, <, <=, >=), the equality operator (=) and the non-equality operator (not=).

In this exercise you must conditionally execute logic. A common way to do this in Clojure is by using cond:

(cond (= x 5) "Expression to evaluate when x equals 5"
      (> x 7) "Expression to evaluate when x is greater than 7"
      :else   "Expression to evaluate in all other cases")

Note

The == operator might be preferable to = in some cases where numbers need to be compared irrespective of the exact type. For instance,

(== 5.0 5) ;; true as both numbers are equal when type is ignored
(= 5.0 5) ;; false as the types of numbers are also taken into account here i.e. float is different from int

The Clojure guide on Equality, specifically the section on Numbers goes into more details.