Question: When is casting performed implicitly, when must you must perform it explicitly, and how does casting between int and double types affect the decimal value

When is casting performed implicitly, when must you must perform it explicitly, and how does casting between int and double types affect the decimal value in a result?

Several classes can substitute for primitives: Integer, Double, and BigDecimal among them (plus Math and NumberFormat can help with manipulation and display). When would you use those classes in a program?

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