NewestCalc

object NewestCalc extends App {
var retry = false
var total = 0.0
var recalc = false
var calc = true
var mod = ""
var one = 0.0
var two = 0.0
var calcstart = false
var samenum = false
def num():Double =  {
        if (mod == "+") {
            return one + two
        }
        else if (mod == "-")    {
            return one - two
        }
        else if (mod == "*")    {
            return one * two
        }
        else if (mod == "/")    {
            return one / two
        }
        else if (mod == "^")    {
            return Math.pow(one,two)
        }
        else    {
            println("invalid response.")
            return -0
        }
}
def numCheck():Unit =   {
        if (total == -0)    {
            calc = true
            recalc = false
            return retry = true
        }
        else    {
            recalc = false
            calc = false
            return retry = false
        }
}
def samenumbcalc() =    {
    var contcalc = readLine();
    if (contcalc.equalsIgnoreCase("Y")) {
        recalc = false
        calc = false
        samenum = true
        calcstart = true
        one = total
    }
    else    {
        recalc = false
        println("continue calculating new numbers? Y/N")
        contcalc = readLine();
        if (contcalc.equalsIgnoreCase("Y")) {
            calcstart = true
            samenum = false
        }
        else    {
            println("program terminated.")
            calcstart = false
        }
    }
}
def printans() =    {
    if  (retry == false)    {
        println(""+total+"")
        println("continue calculating off "+total+"? Y/N.")
        samenumbcalc();
    }
    else    {
        //Nothing printed
    }
}
def inputs() =  {
    if (samenum == false)   {
        do  {
            println("input number one.")
            one = readDouble();
            println("input modifer.")
            mod = readLine();
            println("input number two.")
            two = readDouble();
            total = num();
            numCheck();
            printans();
        }
        while (calc == true)
    }
    else    {
        do  {
            println("input modifer.")
            mod = readLine();
            println("input number two.")
            two = readDouble();
            total = num();
            numCheck();
            printans();
        }
        while (recalc == true)
    }
}
do  {
    inputs();
}
while (calcstart == true)
}