Multiplying variables and doubles in swift
You can only multiple two of the same data type.
var billBeforeTax = 100 // Interpreted as an Integervar taxPercentage = 0.12 // Interpreted as a Doublevar tax = billBeforeTax * taxPercentage // Integer * Double = errorIf you declare billBeforeTax like so..
var billBeforeTax = 100.0It will be interpreted as a Double and the multiplication will work. Or you could also do the following.
var billBeforeTax = 100var taxPercentage = 0.12var tax = Double(billBeforeTax) * taxPercentage // Convert billBeforeTax to a double before multiplying.
You just have to cast your int variable to Double as below:
var billBeforeTax = 100 var taxPercentage = 0.12 var tax = Double(billBeforeTax) * taxPercentage