39 lines
977 B
Plaintext
39 lines
977 B
Plaintext
abstract type Jewel end
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mutable struct RoseQuartz <: Jewel
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carats::Float64
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quality::String
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end
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mutable struct Sapphire <: Jewel
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color::String
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carats::Float64
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quality::String
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end
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color(j::RoseQuartz) = "rosepink"
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color(j::Jewel) = "Use the loupe."
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color(j::Sapphire) = j.color
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function testtypecopy()
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a = Sapphire("blue", 5.0, "good")
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b = RoseQuartz(3.5, "excellent")
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j::Jewel = deepcopy(b)
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println("a is a Jewel? ", a isa Jewel)
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println("b is a Jewel? ", a isa Jewel)
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println("j is a Jewel? ", a isa Jewel)
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println("a is a Sapphire? ", a isa Sapphire)
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println("a is a RoseQuartz? ", a isa RoseQuartz)
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println("b is a Sapphire? ", b isa Sapphire)
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println("b is a RoseQuartz? ", b isa RoseQuartz)
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println("j is a Sapphire? ", j isa Sapphire)
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println("j is a RoseQuartz? ", j isa RoseQuartz)
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println("The color of j is ", color(j), ".")
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println("j is the same as b? ", j == b)
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end
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testtypecopy()
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