What will happen when you try to compile and run the following code segment, assuming the remainder of the code is error-free, and the compiler supports C++ 11?

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
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**Question:**

What will happen when you try to compile and run the following code segment, assuming the remainder of the code is error-free, and the compiler supports C++ 11?

```cpp
int* ptr = nullptr;
int x = 5;
cout << *ptr << endl;
```

- ☐ It will print out `nullptr`.
- ☐ It won't compile, since `ptr` was initialized to `nullptr`.
- ☐ A runtime error will occur; the program terminates on the `cout` statement.
- ☐ It varies from compiler to compiler.

**Explanation:**

The expression `*ptr` attempts to dereference a pointer that has been initialized to `nullptr`. This will generally lead to a runtime error, as dereferencing a null pointer is undefined behavior in C++. The program is likely to terminate when it reaches the `cout` statement, specifically when it tries to output the `*ptr`.
Transcribed Image Text:**Question:** What will happen when you try to compile and run the following code segment, assuming the remainder of the code is error-free, and the compiler supports C++ 11? ```cpp int* ptr = nullptr; int x = 5; cout << *ptr << endl; ``` - ☐ It will print out `nullptr`. - ☐ It won't compile, since `ptr` was initialized to `nullptr`. - ☐ A runtime error will occur; the program terminates on the `cout` statement. - ☐ It varies from compiler to compiler. **Explanation:** The expression `*ptr` attempts to dereference a pointer that has been initialized to `nullptr`. This will generally lead to a runtime error, as dereferencing a null pointer is undefined behavior in C++. The program is likely to terminate when it reaches the `cout` statement, specifically when it tries to output the `*ptr`.
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