Chapter 9: Problem 30

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

Short Answer

Expert verified

Answer: To define a constant pointer to an integer variable in C++, follow these steps: 1. Initialize an integer variable, e.g. `int num = 5;` 2. Define the constant pointer using the syntax `int * const ptr = #`, where 'ptr' is the constant pointer pointing to the memory location of 'num'. 3. Use the constant pointer in your code, where the address it points to cannot be changed.

Step by step solution

Initialize an integer variable

To define a constant pointer, we need a variable to hold an integer value first. Let us declare an int variable and assign an initial value. ```cpp int num = 5; ```

Define constant pointer to an int

Next, we need to create a constant pointer to our integer variable. The syntax for defining a constant pointer to an int in C++ is: ``` int * const ptrName = &variableName ```

Implement the constant pointer

Now we define a constant pointer named 'ptr' to 'num': ```cpp int * const ptr = # ``` The complete code snippet should look like this: ```cpp #include int main() { int num = 5; int * const ptr = # std::cout << "Value of num: " << *ptr << std::endl; std::cout << "Address of num: " << ptr << std::endl; return 0; } ``` In this code, we have defined a constant pointer 'ptr' that holds the address of the integer variable 'num'. The pointer 'ptr' will always point to the memory location of 'num' and its address cannot be changed.

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

Short Answer

Step by step solution

Initialize an integer variable

Define constant pointer to an int

Implement the constant pointer

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