Chapter 9: Problem 29

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

Short Answer

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**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; } ```

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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

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