func calcCircumWithRadius(value:Float) -> Float {
    return value*2*3.14
}

func calcCircumWithDiameter(value:Float) -> Float {
    return value*3.14
}

func getCalcCircum(#isRadius:Bool) -> (Float)->Float {
    if isRadius==true {
        return calcCircumWithRadius
    }
    return calcCircumWithDiameter
}

var function = getCalcCircum(isRadius: true)
function(5)

function = getCalcCircum(isRadius: false)
function(10)