Scala Cannot Resolve Symbol - scala

Question

Currently my system has the ability for a user to enter 2 numbers, the last number on the tail is found and returned, how can I get the data and data2 to only show there numbers, not the SK1/SK3 before. Currently I am getting the error ;
Error:(177, 28) value >= is not a member of (String, Int)
val highest = if (data >= data2){
//Compare 2 values
def mnuCompareTwoStocks(f: (String) => (String, Int)) = {
print("Stock > ")
val data = f(readLine)
print("Stock 2 > ")
val data2 = f(readLine)
val highest = if (data >= data2){
println(data)
}
else
{
println(data2)
}
println(s"${data._1}: ${data._2} ${data2._1}: ${data2._2}")
}
EDIT:
The working outcome
//Compare 2 values
def mnuCompareTwoStocks(f: (String) => (String, Int)) = {
print("Stock > ")
val data = f(readLine)
print("Stock 2 > ")
val data2 = f(readLine)
if (data._2 >= data2._2){
println("The higher stock is " + data)
}
else
{
println("The higher stock is " + data2)
}
println(s"${data._1}: ${data._2} ${data2._1}: ${data2._2}")
}

Answer 1

You are trying to compare 2 tuples of type (String,Int). There is no simple comparison operator for such.
scala> ("a",3) > ("b",0)
<console>:12: error: value > is not a member of (String, Int)
("a",3) > ("b",0)
^
Do you want the String to take precedence or the Int?
scala> ("a",3)._1 > ("b",0)._1
res0: Boolean = false
scala> ("a",3)._2 > ("b",0)._2
res1: Boolean = true

Answer 2

There are several problems in your code which are causing the errors you're seeing.
First, you have a syntax error: to print out the variable highest the way you want to, you need to use + for string concatenation: println("The higher stock is " + highest)
Secondly, highest is only declared inside your if statements so it's out of scope for the println statement. You can solve this issue by declaring it in scope:
...
var highest = 0.0
if(...){
highest = ...
}
else {
highest = ...
}
println("The higher stock is " + highest)
Lastly, and most importantly, the overall design of your method doesn't really make sense to me. f is your parameter to mnuCompareTwoStocks, and it's a function that converts from String to (String, Int). So why are you calling apply (via f(readLine)) on this function and seemingly expecting a numeric datatype back? What is even the purpose of this parameter? If, indeed, you do want the tuple to be returned, you'll need to unpack the numeric component before comparing the values:
val data = f(readLine)
val data2 = f(readLine)
if (data._2 >= data2._2)
...
I see you edited your question to solve the first two issues. However, now you're pointlessly setting val highest = Unit with your if statement...
Regardless, you should unpack the Int component of your tuple if you want to do numeric comparison between them, as shown above.