How do you store the value of an input stream into a double object?

And the language is?

An object is an instantiated class. The class will have variables that can be set to values to hold the state of the object. If this is your class then you need to have a variable to accept the data.

If the data is a string and you need to store that string into a double then you will need to convert the string to a double then assign the double value to the variable.

You should be using a setter method to assign a value to the state variable.

Have fun.