requires("1.34m");
isRow=true;
Dialog.create("Conculator");

massArray = newArray(" g", " mg", " µg");
volArray = newArray(" l", " ml", " µl")
concArray = newArray(" M", " mM", " µM")

Dialog.addNumber("MW:",125 );
Dialog.addMessage("");
Dialog.addNumber("Mass:",62.5 );
Dialog.addChoice("", massArray," mg");

Dialog.addMessage("")
Dialog.addNumber("Concentration:", 20);
Dialog.addChoice("", concArray, " mM" );

Dialog.addMessage("");
Dialog.addNumber("Volume:", 0);
Dialog.addChoice("", volArray," ml");
Dialog.addCheckbox("Results as row", isRow);

Dialog.show();

MW=Dialog.getNumber();
mass = Dialog.getNumber();
massUnits = Dialog.getChoice();

conc= Dialog.getNumber();
concUnits = Dialog.getChoice();
volume = Dialog.getNumber();
volUnits = Dialog.getChoice();
isRow = Dialog.getCheckbox();
volScale=1;
massScale=1;
concScale = 1;
volPref="";
massPref="";
concPref="";

if (volUnits==" ml")
	volScale = 1000;
if (volUnits==" µl")
	volScale = 1000000;

if (massUnits==" mg")
	massScale = 1000;
if (massUnits==" µg")
	massScale = 1000000;

if (concUnits==" mM")
	concScale = 1000;
if (concUnits==" µM")
	concScale = 1000000;

if (volume==0)
	{
	volume = (mass/massScale)/(MW*(conc/concScale));	
	volume= volume*volScale;
	volPref="**";
	}	

if (mass ==0)
	{
	mass = MW*((volume/volScale)*(conc/concScale));	
	mass = mass*massScale;
	massPref="**";
	}

if (conc==0)
	{
	conc= (mass/massScale)/(MW*(volume/volScale));
	conc = conc*concScale;
	concPref="**";
	}

MWString ="MW:  "+ d2s(MW,2);
massString = massPref+"Mass: "+d2s(mass,2)+massUnits+massPref;
volString = volPref+"Volume: "+d2s(volume,2)+ volUnits+volPref;
concString = concPref+"Conc: "+d2s(conc,2)+concUnits+concPref;

if (isRow)
	{
	print(MWString+"\t   "+massString+"\t   "+volString+ "\t   "+concString);
	}
else
	{
	print(MWString); print(massString); print(volString);print(concString); print( "---");	
	}	
Dialog.create("Conculator - Results");
Dialog.addMessage(MWString);
Dialog.addMessage(massString);
Dialog.addMessage(volString);
Dialog.addMessage(concString);
Dialog.show();