You have defined the method number() which takes a String, and returns a double. The type of Strings it supports are like “one”, “two” and so on, not “1”, “2”...
You have said that you tried the input add 50 34, and based on your code, this is going to always return 0.0
Try providing the input add five three and see what output you get.
Your current code will not support a calculation where the input is more than 9. And the user has to provide the value in words, so they can’t type 9, they have to type the word ‘nine’.
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