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Oh duh... I forgot about that. Add the keyword 'static' to your method signatures

public static double cube(double value)
public static double square(double value)

the static keyword means you...

haha, i wasn't reading carefully :)

it should be this:


// get the value squared
double squared = square(entry);
// print it out
...

Simple, in fact you're already calling a few methods in your code. They just happen to be methods you didn't write :)

The general from:

method_name(method_parameters)

method_name is the name...