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There is a way to use the Scanner class that does not require a console: Put the input values into the Scanner class's constructor:

Scanner input = new Scanner("3.4 5.6 7.8"); // Load 3...

At line 10 the program calls the nextDouble method but there isn't any double value available.

What was entered for the Scanner class's nextDouble method to read?

The && operator works with two boolean operands: boolean1 && boolean2
In the expression:
root1 && root2 == 0
Only the expression: root2 == 0 has a boolean value
root1 is a double and not a...

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