Chapter 9: Problem 29

Write the definition of ptr, a pointer to a constant int.

Short Answer

Expert verified

**Answer:** To declare a pointer that points to a constant integer, you use the 'const' keyword along with the data type 'int', followed by an asterisk (*) to indicate it's a pointer. For example, `const int *ptr;`. You can assign the address of a constant integer to the pointer using the address-of operator (&). For instance, if you have a constant integer `const int num = 10;`, you can assign its address to the pointer like this: `ptr = #`.

Step by step solution

Declare a constant integer

To start, we need to have a constant integer value for the pointer to point to. Let's create a constant integer with the value 10: ```cpp const int num = 10; ```

Declare a pointer to a constant integer

Now let's create a pointer that points to a constant integer. We use the keyword 'const' and the data type 'int' in the definition, along with an asterisk (*) to indicate that it is a pointer: ```cpp const int *ptr; ```

Assign the address of the constant integer to the pointer

Finally, we can assign the address of the constant integer 'num' to the pointer 'ptr' using the address-of operator (&): ```cpp ptr = # ```

Complete Example

Here is how the complete code would look like: ```cpp #include int main() { const int num = 10; const int *ptr; ptr = # std::cout << "Value of num: " << num << std::endl; std::cout << "Address of num: " << # << std::endl; std::cout << "Value of ptr: " << ptr << std::endl; std::cout << "Value pointed by ptr: " << *ptr << std::endl; return 0; } ```

Unlock Step-by-Step Solutions & Ace Your Exams!

Full Textbook Solutions
Get detailed explanations and key concepts
Unlimited Al creation
Al flashcards, explanations, exams and more...
Ads-free access
To over 500 millions flashcards
Money-back guarantee
We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

Recommended explanations on Computer Science Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Write the definition of ptr, a pointer to a constant int.

Short Answer

Step by step solution

Declare a constant integer

Declare a pointer to a constant integer

Assign the address of the constant integer to the pointer

Complete Example

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Computer Science Textbooks

Big Data

Game Design in Computer Science

Data Representation in Computer Science

Computer Network

Issues in Computer Science

Computer Systems

Study anywhere. Anytime. Across all devices.