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Update why-there-only-value-passing-in-java.md
bad c++ code here incr(*age) --> incr(age);
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@ -177,7 +177,7 @@ int main()
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{
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int age = 10;
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std::cout << "invoke before: " << age << "\n";
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incr(*age);
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incr(age);
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std::cout << "invoke after: " << age << "\n";
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}
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```
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