int is a particular datatype, you should make sure it's formatted differently to other text to signify that you are talking about a specific datatype rather than integers in general. That's far more important than whether you use "array of
ints" or "
Personally I would argue in favour of "array of
ints" (or in the general case "array of integers"), because it's more formal and less ambiguous, both of which are reasonably important in technical writing. (As an added bonus,
array of int is actually valid syntax in certain programming languages.)
If you can't decide, one option is to introduce them as synonyms for each other - to explicitly tell the reader that "
int array" means the same as "array of
ints", after which you would be free to use either, as appropriate, without confusing the reader (because both terms have been explained).
In general, you're best off introducing the terminology that you're going to use before you use it just to make completely sure that your audience understands what you're talking about (people who are used to different languages may have different expectations). This has the added benefit of potentially making your document more accessible to people who are less familiar with the terminology, e.g. novice programmers.