foreach(i RANGE 1 100)
  math(EXPR off3 "${i} % 3")
  math(EXPR off5 "${i} % 5")
  if(NOT off3 AND NOT off5)
    message(FizzBuzz)
  elseif(NOT off3)
    message(Fizz)
  elseif(NOT off5)
    message(Buzz)
  else()
    message(${i})
  endif()
endforeach(i)