function complex_test()
    c1 = (2 + 3im)
    c2 = (4 + 5im)
    c3 = (c1 + c2)
    @assert(c3 == (6 + 8im))
    c4 = (c1 + 3)
    @assert(c4 == (5 + 3im))
    c5 = (c1 + 4im)
    @assert(c5 == (2 + 7im))
    c6 = (c3 - 2.3)
    @assert(c6 == (3.7 + 8im))
end

function main()
    complex_test()
    println(join(["OK"], " "))
end

main()
