Cobra Forums

class Add

def main
print 'Enter two numbers:'
x = Console.readLine
y = Console.readLine
print 'sum is', int.parse(x) + int.parse(y)
print 'done.'


that is the code i used when compiling in xamarin studio cobra language'

but i wonder why i get this error when compiling === Error: Argument 1 of method "parse" expects a non-nilable type (String), but the call is supplying a nilable type (String?). The declaration is "parse(s as String)", the call is supplying an arglist of type "(String?)". (printinput)

.readLine returns "String?" but .parse wants "String", in other words, nilable vs. non. You can change the code to:

... in other words nil coalesce with an empty string. This will guarantee non-nil.