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}; How many times a constructor is called with the following definition of an array? (Hint: Try it in an IDE) B arr[4] {{0}, {1}, B{2}, 3};

}; How many times a constructor is called with the following definition of an array? (Hint: Try it in an IDE) B arr[4] {{0}, {1}, B{2}, 3};

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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### Understanding Constructors in C++ Let B be a class with a constructor that can receive an `int` as its parameter. B doesn't have a user-provided default constructor. Here's the definition of class B: ```cpp class B { public: B(int n) { cout << n << endl; }; }; ``` ### Question How many times is a constructor called with the following definition of an array? (Hint: Try it in an IDE) ```cpp B arr[4] {{0}, {1}, B{2}, 3}; ``` ### Options: 1. ⭕ 3 2. ⭕ 2 3. ⭕ 4 4. ⭕ 1 5. ⭕ None of these. ### Explanation: In the array definition `B arr[4] {{0}, {1}, B{2}, 3};`: - The statement initializes an array of `B` objects with 4 elements. - `{0}`, `{1}`, `B{2}`, and `3` each call the constructor of `B`. Thus, the constructor is called 4 times for each of these initializations. To verify this, you can try compiling this code snippet in an IDE and observe the output. ### Answer: ⭕ 4
Transcribed Image Text:### Understanding Constructors in C++ Let B be a class with a constructor that can receive an `int` as its parameter. B doesn't have a user-provided default constructor. Here's the definition of class B: ```cpp class B { public: B(int n) { cout << n << endl; }; }; ``` ### Question How many times is a constructor called with the following definition of an array? (Hint: Try it in an IDE) ```cpp B arr[4] {{0}, {1}, B{2}, 3}; ``` ### Options: 1. ⭕ 3 2. ⭕ 2 3. ⭕ 4 4. ⭕ 1 5. ⭕ None of these. ### Explanation: In the array definition `B arr[4] {{0}, {1}, B{2}, 3};`: - The statement initializes an array of `B` objects with 4 elements. - `{0}`, `{1}`, `B{2}`, and `3` each call the constructor of `B`. Thus, the constructor is called 4 times for each of these initializations. To verify this, you can try compiling this code snippet in an IDE and observe the output. ### Answer: ⭕ 4
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