require "iuplua"

tb1 = iup.text{
size = "80x10"
}
tb2 = iup.text{
size = "80x10"
}
tb3 = iup.text{
size = "80x10"
}

b = iup.button{
title="Generate",
size = "80x15",
action=function()
tb3.value = math.random(tb1.value,tb2.value)
end
}

rng = iup.dialog{
title="Random Number Generator",
size="90x66",
iup.vbox{
iup.hbox{tb1},
iup.hbox{tb2},
iup.hbox{b},
iup.hbox{tb3},
},
}

rng:show()

iup.MainLoop()