将int转换为int32

I am working on pulling in rows from the Db and storing the results in a Slice/Array

I need to calculate the totalRecords & totalPages.

pseudoCode :: 
perPage int32 := ( some number ) 
totalRecords := len(array)
totalPages := perPage/totalRecords

I keep getting this error.

terminal::
`invalid operation: perPage / totalRecords (mismatched types int32 and int)`

len(array) returns an int convert it to an int32 int32(len(array)) or convert perPage to an int