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#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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int main()
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{
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// implicitly create a JSON null value
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json j1;
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// explicitly create a JSON null value
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json j2(nullptr);
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// serialize the JSON null value
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std::cout << j1 << '\n' << j2 << '\n';
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}
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